Memory leaks and multi threading issues in managed client.

In our company we use a lot of Oracle, and after the release of the managed provider we migrated all applications to it. First the things were very impressive : the new client was faster, but after some days applications that uses 100MB with old client goes to 1GB and up. The memory is not the only issue, we use a lot of multi threading, and we experience connection drops and not disposal, after 1 days working one of the application had over 100 sessions on the server. I think there is something wrong with connection pool and multi threading.
Is someone experience same problems.
Yesterday we went back with unmanaged provider. Now things are back to normal.

connection drops: did you try to use "Validate Connection=true" parameter in your connection string?
the new client was faster: are you sure with this statement? Even in 64bit environment? I got quite serious performance problems when running application under 64bit process: https://forums.oracle.com/thread/2595323

Similar Messages

Memory leak with multi-threaded environment

When starting an environment with the THREADED_MUTEXED
or THREADED_UNMUTEXED mode parameter, the oracle OCCI API
has a memory leak. This can be demonstrated by modifying
the "occidml.cpp" demo program as follows:
Replace line 26:
env = Environment::createEnvironment (Environment::DEFAULT);
with
env = Environment::createEnvironment (Environment::THREADED_MUTEXED);
And replace line 164:
demo->displayAllRows();
with
for (int ii=0; ii<10000; ii++) demo->displayAllRows();
Recompile and run the program, and use "top" to see the
size of the process's used memory continually increase
unbounded.
I am using the Oracle 9.2.0.1.0 database on Linux,
gcc version 2.96.
Is anyone aware of a fix for this problem?

Yeah, I did suffer from this.
If possible , you can switch to using OCCI on Oracle 10G client , you will find no memory leak issue anymore.
Another issue is that OCCI is using default connection-blocking implementation , if a DB connection is blocked by accident just like plugging out the network link, you can not get any timeout or connection closed indications. You must implement your own OCCI connection timeout strategy, and you must kill the thread/process you are using.

Enterprise User and Multi Thread Server

Hi,
We are going to build a system which uses a configuration:
10g2
Enterprise User
Multi Thread Server
Client apps accesses db over JDBC/SSL
Could some please share experience about issues regarding
using Enterprise User and Multi Thread Server ?
Is MTS transparant for Enterprise User authentication ?
Regards,
Cezary

If you build simpserv with -t, and set MIN and MAXDISPATCHTHREADS, you
should have an example of a multithreaded server.
Scott
Johan Philippe wrote:
>
We have been going to the documentation on multi-threading and contexting in servers
on Tuxedo 7.1.
And the impression so far is that apart from the function definitions there is
not much information around.
Didn't even find a simple example of a multi-threaded server in the Bea refs yet.
Does anyone know/have such an example?
And is anyone using multi-contexting in a server, because the limitation that
only server-dispatched
thread get a context puts quite a limitation on its usefullness.

Memory leak when using Threads?

I did an experiment and noticed a memory leak when I was using threads.. Here's what I did.
======================================
while( true )
     Scanner sc = new Scanner(System.in);
     String answer;
     System.out.print("Press Enter to continue...");
     answer = sc.next();
     new TestThread();
========================================
And TestThead is the following
========================================
import java.io.*;
import java.net.*;
public class TestThread extends Thread
public TestThread() { start(); }
public void run() { }
=====================================
When I open windows Task Manager, every time a new thread starts and stops, the java.exe increases the Mem Usage.. Its a memory leak!? What is going on in this situation.. If I start a thread and the it stops, and then I start a new thread, why does it use more memory?
-Brian

MoveScanner sc = new
Scanner(System.in);out of the
loop.Scanner sc = new Scanner(System.in);
while (true) {
That won't matter in any meaningful way.
Every loop iteration creates a new Scanner, but it also makes a Scanner eligible for GC, so the net memory requirement of the program is constant.
Now, of course, it's possible that the VM won't bother GCing until 64 MB worth of Scanners have been created, but we don't care about that. If we're allowing the GC 64 MB, then we don't care how it uses it or when it cleans it up.

Yosemite and Mail massive memory leak and excessive CPU usage

I've just installed Yosemite and upgraded to 10.10.2 via the AppStore. Now I have a problem with Mail sucking up all the CPU (>106% !) and memory (>8Gb and rising while doing nothing). Everything runs fine when I quit Mail. Very disturbing behaviour!
I've tried several suggestions found elsewhere on the board here, such as turning off and even removing all Mail plug-ins including SpamSieve, but without positive results. I've tried un-selecting 'Store draft msgs on server', as well as the option for junk and sent msgs. but again without any difference. Going Offline within Mail also makes no difference to its memory hogging or CPU usage.
I notice this is an issue that's been around since last year (wish I'd known that before upgrading to Yosemite today) and I am just completely flabbergasted that it still exists. Would've thought Apple'd have fixed it in the first but certainly in the second incremental OSX Yosemite release.
Is there anything else I could try that's proven to be effective in stopping Mail's massive memory leak?

Okay, I've run Disk Util and restarted. Seems to have made a little bit of a difference to the RAM gobbling in that it appears to be going at a slower rate, but it's still up at around the 45Gb after an hour. Here's the EtreCheck report in the hope that it helps.
EtreCheck version: 2.1.6 (109)
Report generated 28 January 2015 4:38:22 pm AEDT
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Click the [Adware] links for help removing adware.
Hardware Information: ℹ️
    MacBook Pro (Retina, 15-inch, Mid 2014) (Technical Specifications)
    MacBook Pro - model: MacBookPro11,3
    1 2.5 GHz Intel Core i7 CPU: 4-core
    16 GB RAM Not upgradeable
        BANK 0/DIMM0
            8 GB DDR3 1600 MHz ok
        BANK 1/DIMM0
            8 GB DDR3 1600 MHz ok
    Bluetooth: Good - Handoff/Airdrop2 supported
    Wireless: en0: 802.11 a/b/g/n/ac
    Battery Health: Normal - Cycle count 16
Video Information: ℹ️
    Intel Iris Pro
        Color LCD spdisplays_2880x1800Retina
    NVIDIA GeForce GT 750M - VRAM: 2048 MB
System Software: ℹ️
    OS X 10.10.2 (14C109) - Time since boot: 1:1:19
Disk Information: ℹ️
    APPLE SSD SM0512F disk0 : (500.28 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
        Macintosh HD (disk1) / : 499.05 GB (413.24 GB free)
            Core Storage: disk0s2 499.42 GB Online
USB Information: ℹ️
    Apple Internal Memory Card Reader
    Asmedia ASM107x
        Asmedia ASM107x
    Apple Inc. Apple Internal Keyboard / Trackpad
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
    Asmedia ASM107x
        Asmedia ASM107x
            Logitech Logitech USB Optical Mouse
            Apple, Inc. Keyboard Hub
                Apple, Inc Apple Keyboard
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Configuration files: ℹ️
    /etc/hosts - Count: 2
Gatekeeper: ℹ️
    Mac App Store and identified developers
Kernel Extensions: ℹ️
        /Applications/DiskWarrior.app
    [not loaded]    com.alsoft.Preview (5 - SDK 10.5) [Support]
        /Applications/ibVPN.app
    [not loaded]    net.tunnelblick.tap (1.0) [Support]
    [not loaded]    net.tunnelblick.tun (1.0) [Support]
        /Library/Extensions
    [loaded]    at.obdev.nke.LittleSnitch (4231 - SDK 10.8) [Support]
    [loaded]    com.sophos.kext.sav (9.2.50 - SDK 10.8) [Support]
    [loaded]    com.sophos.nke.swi (9.2.50 - SDK 10.8) [Support]
    [loaded]    jp.plentycom.driver.SteerMouse (4.2.2 - SDK 10.6) [Support]
Problem System Launch Agents: ℹ️
    [killed]    com.apple.AirPlayUIAgent.plist
    [killed]    com.apple.CallHistoryPluginHelper.plist
    [killed]    com.apple.CallHistorySyncHelper.plist
    [killed]    com.apple.cloudd.plist
    [killed]    com.apple.icloud.fmfd.plist
    [killed]    com.apple.nsurlsessiond.plist
    [killed]    com.apple.pluginkit.pkd.plist
    [killed]    com.apple.security.cloudkeychainproxy.plist
    [killed]    com.apple.spindump_agent.plist
    [killed]    com.apple.telephonyutilities.callservicesd.plist
    10 processes killed due to memory pressure
Problem System Launch Daemons: ℹ️
    [killed]    com.apple.awdd.plist
    [killed]    com.apple.ctkd.plist
    [killed]    com.apple.icloud.findmydeviced.plist
    [killed]    com.apple.ifdreader.plist
    [killed]    com.apple.nehelper.plist
    [killed]    com.apple.nsurlsessiond.plist
    [killed]    com.apple.softwareupdated.plist
    [killed]    com.apple.wdhelper.plist
    8 processes killed due to memory pressure
Launch Agents: ℹ️
    [running]    at.obdev.LittleSnitchUIAgent.plist [Support]
    [not loaded]    com.adobe.AAM.Updater-1.0.plist [Support]
    [running]    com.adobe.AdobeCreativeCloud.plist [Support]
    [running]    com.sophos.uiserver.plist [Support]
Launch Daemons: ℹ️
    [running]    at.obdev.littlesnitchd.plist [Support]
    [running]    com.adobe.adobeupdatedaemon.plist [Support]
    [loaded]    com.adobe.fpsaud.plist [Support]
    [loaded]    com.microsoft.office.licensing.helper.plist [Support]
    [running]    com.sophos.common.servicemanager.plist [Support]
    [running]    com.synium.cleanappdaemon.plist [Support]
    [running]    com.syniumsoftware.CleanAppDaemon.plist [Support]
User Launch Agents: ℹ️
    [loaded]    com.adobe.ARM.[...].plist [Support]
    [running]    com.c-command.SpamSieve.LaunchAgent.plist [Support]
    [loaded]    com.google.keystone.agent.plist [Support]
    [not loaded]    com.linotype.FontFolderProtector.plist [Support]
    [failed]    com.wondershare.mobilegodaemon.plist [Support]
    [not loaded]    info.lokiware.attachmenttamer.cleanup.plist [Support]
    [invalid?]    info.lokiware.attachmenttamer.setupagent.plist [Support]
User Login Items: ℹ️
    Letter Opener Updater    Application (/Library/Mail/Bundles/Letter Opener.mailbundle/Contents/Resources/Software Update.app)
    iTunesHelper    Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    Default Folder X Helper    Application Hidden (/Users/[redacted]/Library/PreferencePanes/Default Folder X.prefPane/Contents/Resources/Default Folder X Helper.app)
    FontExplorer X Pro    Application Hidden (/Applications/FontExplorer X Pro.app)
    Calendar    Application Hidden (/Applications/Calendar.app)
    SteerMouse Manager    Application (/Applications/Utilities/SteerMouse.app/Contents/MacOS/SteerMouse Manager.app)
    Mail    Application Hidden (/Applications/Mail.app)
    Android File Transfer Agent    Application (/Users/[redacted]/Library/Application Support/Google/Android File Transfer/Android File Transfer Agent.app)
    DiskWarriorStarter    Application (/Applications/DiskWarrior.app/Contents/Helpers/DiskWarriorStarter.app)
    finderpop-daemon    Application (/Users/[redacted]/Library/PreferencePanes/FinderPop.prefPane/Contents/Resource s/finderpop-daemon.app)
    XtraFinder    Application Hidden (/Applications/XtraFinder.app)
Internet Plug-ins: ℹ️
    AdobeAAMDetect: Version: AdobeAAMDetect 2.0.0.0 - SDK 10.7 [Support]
    FlashPlayer-10.6: Version: 16.0.0.296 - SDK 10.6 [Support]
    QuickTime Plugin: Version: 7.7.3
    AdobePDFViewerNPAPI: Version: 11.0.10 - SDK 10.6 [Support]
    AdobePDFViewer: Version: 11.0.10 - SDK 10.6 [Support]
    Flash Player: Version: 16.0.0.296 - SDK 10.6 [Support]
    Default Browser: Version: 600 - SDK 10.10
    SharePointBrowserPlugin: Version: 14.4.7 - SDK 10.6 [Support]
User internet Plug-ins: ℹ️
    iGetter Plugin: Version: 2.9.3 [Support]
    iGetterScriptablePlugin: Version: 2.9.3 [Support]
Safari Extensions: ℹ️
    1Password [Installed]
    iGetter Extension [Installed]
3rd Party Preference Panes: ℹ️
    Default Folder X [Support]
    FinderPop [Support]
    FUSE for OS X (OSXFUSE) [Support]
    SteerMouse [Support]
Time Machine: ℹ️
    Time Machine not configured!
Top Processes by CPU: ℹ️
      105%    Mail
        3%    WindowServer
        2%    sysmond
        2%    Activity Monitor
        0%    fontd
Top Processes by Memory: ℹ️
    4.10 GB    Mail
    103 MB    Finder
    86 MB    SophosScanD
    86 MB    InterCheck
    86 MB    WindowServer
Virtual Memory Information: ℹ️
    84 MB    Free RAM
    2.92 GB    Active RAM
    2.87 GB    Inactive RAM
    2.76 GB    Wired RAM
    2.57 GB    Page-ins
    23 MB    Page-outs
Diagnostics Information: ℹ️
    Jan 28, 2015, 03:37:41 PM    Self test - passed
    Jan 28, 2015, 02:49:01 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/Android File Transfer Agent_2015-01-28-144901_[redacted].crash
    Jan 28, 2015, 09:31:04 AM    /Library/Logs/DiagnosticReports/Mail_2015-01-28-093104_[redacted].cpu_resource. diag [Details]
    Jan 28, 2015, 07:39:17 AM    /Library/Logs/DiagnosticReports/AdobeCrashDaemon_2015-01-28-073917_[redacted].c rash
    Jan 27, 2015, 07:54:29 PM    /Library/Logs/DiagnosticReports/AdobeCrashDaemon_2015-01-27-195429_[redacted].c rash

Large Memory Usage and Frozen [thread dump attached]

Hi,
SQL Developer (Version 2.1.1.64, WinXP Pro, Java 1.6, Oracle 10g R2) always uses at least 550MB of memory, if left open, for more than a day, it invariably goes up to 700-800MB.
If I close all windows and connections, virtually no memory is reclaimed.
I clicked + beside a view to see the columns, sqldeveloper froze for a few minutes, below is the thread dump.
2010-05-21 11:31:58
Full thread dump Java HotSpot(TM) Client VM (14.2-b01 mixed mode):
"CONNECTION_ALIVE" prio=6 tid=0x3891c000 nid=0x1d58 waiting for monitor entry [0x3a55f000]
java.lang.Thread.State: BLOCKED (on object monitor)
at oracle.jdbc.driver.T4CConnection.doPingDatabase(T4CConnection.java:3398)
- waiting to lock <0x09ad05f8> (a oracle.jdbc.driver.T4CConnection)
at oracle.jdbc.driver.PhysicalConnection.pingDatabase(PhysicalConnection.java:7074)
at oracle.javatools.db.ora.BaseOracleDatabase.isConnectionAlive(BaseOracleDatabase.java:165)
at oracle.javatools.db.AbstractDatabase$1.run(AbstractDatabase.java:316)
at java.lang.Thread.run(Thread.java:619)
"Loading Children" prio=6 tid=0x3891bc00 nid=0x12c4 waiting on condition [0x39d5f000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x03eab570> (a java.util.concurrent.FutureTask$Sync)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:747)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:905)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1217)
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:218)
at java.util.concurrent.FutureTask.get(FutureTask.java:83)
at oracle.dbtools.raptor.backgroundTask.RaptorTaskManager$IdeTaskTracker.run(RaptorTaskManager.java:532)
at java.lang.Thread.run(Thread.java:619)
"pool-2-thread-57" prio=6 tid=0x3891b400 nid=0x2094 waiting on condition [0x35b5f000]
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x09b819f0> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireNanos(AbstractQueuedSynchronizer.java:841)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireNanos(AbstractQueuedSynchronizer.java:1160)
at java.util.concurrent.locks.ReentrantLock.tryLock(ReentrantLock.java:416)
at oracle.dbtools.raptor.utils.Connections.lock(Connections.java:1334)
at oracle.dbtools.raptor.utils.Connections.lock(Connections.java:1319)
at oracle.dbtools.raptor.utils.Connections.lock(Connections.java:1306)
at oracle.dbtools.raptor.navigator.xml.AbstractItemInstance.lockConnection(AbstractItemInstance.java:52)
at oracle.dbtools.raptor.navigator.xml.XmlNodeInstance.listChildren(XmlNodeInstance.java:55)
at oracle.dbtools.raptor.navigator.ObjectNodeFilter$ObjectNodeFilterLoadTask.doWorkImpl(ObjectNodeFilter.java:78)
at oracle.dbtools.raptor.navigator.DeferredLoadingFilter$FilterLoadTask.doWork(DeferredLoadingFilter.java:124)
at oracle.dbtools.raptor.navigator.DeferredLoadingFilter$FilterLoadTask.doWork(DeferredLoadingFilter.java:113)
at oracle.dbtools.raptor.backgroundTask.RaptorTask.call(RaptorTask.java:193)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at oracle.dbtools.raptor.backgroundTask.RaptorTaskManager$RaptorFutureTask.run(RaptorTaskManager.java:492)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
"pool-2-thread-55" prio=6 tid=0x38d68400 nid=0xd74 runnable [0x3a15f000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at oracle.net.ns.Packet.receive(Packet.java:239)
at oracle.net.ns.DataPacket.receive(DataPacket.java:92)
at oracle.net.ns.NetInputStream.getNextPacket(NetInputStream.java:172)
at oracle.net.ns.NetInputStream.read(NetInputStream.java:117)
at oracle.net.ns.NetInputStream.read(NetInputStream.java:92)
at oracle.net.ns.NetInputStream.read(NetInputStream.java:77)
at oracle.jdbc.driver.T4CMAREngine.unmarshalUB1(T4CMAREngine.java:1023)
at oracle.jdbc.driver.T4CMAREngine.unmarshalSB1(T4CMAREngine.java:999)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:584)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:194)
at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:785)
at oracle.jdbc.driver.T4CPreparedStatement.executeMaybeDescribe(T4CPreparedStatement.java:860)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1186)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3381)
at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3425)
- locked <0x09ad05f8> (a oracle.jdbc.driver.T4CConnection)
at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1490)
at oracle.dbtools.raptor.controls.grid.ResultSetTableModel.openResultSet(ResultSetTableModel.java:412)
at oracle.dbtools.raptor.controls.grid.ResultSetTableModel.fetchNext(ResultSetTableModel.java:169)
at oracle.dbtools.raptor.controls.grid.ResultSetTableModel$4.doWork(ResultSetTableModel.java:556)
at oracle.dbtools.raptor.controls.grid.ResultSetTableModel$4.doWork(ResultSetTableModel.java:540)
at oracle.dbtools.raptor.backgroundTask.RaptorTask.call(RaptorTask.java:193)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at oracle.dbtools.raptor.backgroundTask.RaptorTaskManager$RaptorFutureTask.run(RaptorTaskManager.java:492)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
"AWT-EventQueue-0" prio=6 tid=0x354fac00 nid=0x18d4 waiting for monitor entry [0x3a45f000]
java.lang.Thread.State: BLOCKED (on object monitor)
at oracle.jdbc.driver.PhysicalConnection.getMetaData(PhysicalConnection.java:3891)
- waiting to lock <0x09ad05f8> (a oracle.jdbc.driver.T4CConnection)
at oracle.dbtools.raptor.plscope.Query.getToolTipText(Query.java:58)
at oracle.dbtools.raptor.phighlight.TooltipPlugin$1.getToolTipText(TooltipPlugin.java:29)
at oracle.ide.ceditor.CodeEditor.getToolTipText(CodeEditor.java:1734)
- locked <0x17245f98> (a java.util.ArrayList)
at oracle.javatools.editor.BasicEditorPane.getToolTipText(BasicEditorPane.java:1530)
at javax.swing.ToolTipManager$insideTimerAction.actionPerformed(ToolTipManager.java:658)
at javax.swing.Timer.fireActionPerformed(Timer.java:271)
at javax.swing.Timer$DoPostEvent.run(Timer.java:201)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
"Background Parser" prio=6 tid=0x38a43400 nid=0x23c4 waiting on condition [0x39c5f000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at oracle.dbtools.raptor.plsql.BackgroundParser$1.construct(BackgroundParser.java:112)
at oracle.dbtools.raptor.utils.NamedSwingWorker$2.run(NamedSwingWorker.java:115)
at java.lang.Thread.run(Thread.java:619)
"SwingWorker-pool-5-thread-1142" prio=6 tid=0x38868800 nid=0x1a7c waiting on condition [0x3820f000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x0e77bc10> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
"Background Parser" prio=6 tid=0x38a76c00 nid=0x1d18 waiting on condition [0x3a35f000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at oracle.dbtools.raptor.plsql.BackgroundParser$1.construct(BackgroundParser.java:112)
at oracle.dbtools.raptor.utils.NamedSwingWorker$2.run(NamedSwingWorker.java:115)
at java.lang.Thread.run(Thread.java:619)
"Background Parser" prio=6 tid=0x387e2800 nid=0xd00 waiting on condition [0x3a25f000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at oracle.dbtools.raptor.plsql.BackgroundParser$1.construct(BackgroundParser.java:112)
at oracle.dbtools.raptor.utils.NamedSwingWorker$2.run(NamedSwingWorker.java:115)
at java.lang.Thread.run(Thread.java:619)
"Background Parser" prio=6 tid=0x38752000 nid=0x2794 waiting on condition [0x39e5f000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at oracle.dbtools.raptor.plsql.BackgroundParser$1.construct(BackgroundParser.java:112)
at oracle.dbtools.raptor.utils.NamedSwingWorker$2.run(NamedSwingWorker.java:115)
at java.lang.Thread.run(Thread.java:619)
"Swing-Shell" daemon prio=6 tid=0x367f0000 nid=0xd7c waiting on condition [0x3a85f000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x1069d0d8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at sun.awt.shell.Win32ShellFolderManager2$ComInvoker$3.run(Win32ShellFolderManager2.java:458)
at java.lang.Thread.run(Thread.java:619)
"Persistence Auto Flusher" daemon prio=6 tid=0x388a5c00 nid=0x1950 in Object.wait() [0x37e0f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:485)
at java.util.TimerThread.mainLoop(Timer.java:483)
- locked <0x0e892d48> (a java.util.TaskQueue)
at java.util.TimerThread.run(Timer.java:462)
"Thread-76" prio=6 tid=0x387aec00 nid=0x259c runnable [0x00000000]
java.lang.Thread.State: RUNNABLE
"WeakDataReference polling" prio=2 tid=0x38752800 nid=0xe94 in Object.wait() [0x3a05f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
- locked <0x0b6ba260> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
at oracle.ide.util.WeakDataReference$Cleaner.run(WeakDataReference.java:88)
at java.lang.Thread.run(Thread.java:619)
"Image Animator 3" daemon prio=4 tid=0x3861b400 nid=0x2330 waiting on condition [0x3978f000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at sun.awt.image.GifFrame.dispose(GifImageDecoder.java:653)
at sun.awt.image.GifImageDecoder.produceImage(GifImageDecoder.java:230)
at sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.java:246)
at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:172)
at sun.awt.image.ImageFetcher.run(ImageFetcher.java:136)
"Background Parser" prio=6 tid=0x38348800 nid=0x978 waiting on condition [0x3988f000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at oracle.dbtools.raptor.plsql.BackgroundParser$1.construct(BackgroundParser.java:112)
at oracle.dbtools.raptor.utils.NamedSwingWorker$2.run(NamedSwingWorker.java:115)
at java.lang.Thread.run(Thread.java:619)
"TextBufferScavenger" prio=6 tid=0x38324800 nid=0x1af0 in Object.wait() [0x3968f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
- locked <0x09bb9158> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
at oracle.ide.model.TextNode$FacadeBufferReference$PollingThread.run(TextNode.java:1949)
"pool-4-thread-1" prio=6 tid=0x36960400 nid=0x1a84 waiting on condition [0x35a5f000]
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x08150a78> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:1963)
at java.util.concurrent.DelayQueue.take(DelayQueue.java:164)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:583)
at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:576)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
"IconOverlayTracker Timer" prio=6 tid=0x38520c00 nid=0x1b48 in Object.wait() [0x3950f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:485)
at java.util.TimerThread.mainLoop(Timer.java:483)
- locked <0x0795f290> (a java.util.TaskQueue)
at java.util.TimerThread.run(Timer.java:462)
"Timer queue for AWT thread" daemon prio=6 tid=0x369b4000 nid=0x1f20 in Object.wait() [0x3940f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x077e1358> (a java.lang.Object)
at java.lang.Object.wait(Object.java:485)
at ice.util.awt.TimedAWTExecutor.nextElem(TimedAWTExecutor.java:108)
- locked <0x077e1358> (a java.lang.Object)
at ice.util.awt.TimedAWTExecutor.runScheduler(TimedAWTExecutor.java:130)
at ice.util.awt.TimedAWTExecutor$1.run(TimedAWTExecutor.java:19)
"WaitCursor-Timer" prio=6 tid=0x367c3c00 nid=0x1010 in Object.wait() [0x37b0f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:485)
at java.util.TimerThread.mainLoop(Timer.java:483)
- locked <0x077e1400> (a java.util.TaskQueue)
at java.util.TimerThread.run(Timer.java:462)
"Native Directory Watcher" prio=2 tid=0x368d4000 nid=0x2334 runnable [0x3830f000]
java.lang.Thread.State: RUNNABLE
at oracle.ide.natives.NativeHandler.enterWatcherThread(Native Method)
at oracle.ide.natives.NativeHandler$2.run(NativeHandler.java:252)
at java.lang.Thread.run(Thread.java:619)
"BaseTreeExplorer.NodeOpeningExecutor" prio=6 tid=0x3684b000 nid=0x8b0 waiting on condition [0x3810f000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x06950af0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
"Scheduler" daemon prio=6 tid=0x36846400 nid=0x14bc in Object.wait() [0x37f0f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:485)
at oracle.dbtools.raptor.backgroundTask.TaskLinkedList.takeNextTask(TaskLinkedList.java:47)
- locked <0x06950c70> (a oracle.dbtools.raptor.backgroundTask.TaskLinkedList)
at oracle.dbtools.raptor.backgroundTask.RaptorTaskManager$SchedulerThread.run(RaptorTaskManager.java:422)
"TimerQueue" daemon prio=6 tid=0x36832800 nid=0x88c in Object.wait() [0x37d0f000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at javax.swing.TimerQueue.postExpiredTimers(TimerQueue.java:218)
- locked <0x06950da8> (a javax.swing.TimerQueue)
at javax.swing.TimerQueue.run(TimerQueue.java:234)
- locked <0x06950da8> (a javax.swing.TimerQueue)
at java.lang.Thread.run(Thread.java:619)
"ChangeSetService" prio=2 tid=0x367fd400 nid=0x2754 in Object.wait() [0x37c0f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x06892cc0> (a oracle.jdevimpl.vcs.changeset.ChangeSetService)
at java.lang.Object.wait(Object.java:485)
at oracle.jdevimpl.vcs.changeset.ChangeSetService.awaitEvents(ChangeSetService.java:178)
- locked <0x06892cc0> (a oracle.jdevimpl.vcs.changeset.ChangeSetService)
at oracle.jdevimpl.vcs.changeset.ChangeSetService.eventLoop(ChangeSetService.java:199)
at oracle.jdevimpl.vcs.changeset.ChangeSetService.access$200(ChangeSetService.java:56)
at oracle.jdevimpl.vcs.changeset.ChangeSetService$2.run(ChangeSetService.java:138)
at java.lang.Thread.run(Thread.java:619)
"TimedCache-Timer" daemon prio=6 tid=0x35d52c00 nid=0x2448 in Object.wait() [0x3624f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:485)
at java.util.TimerThread.mainLoop(Timer.java:483)
- locked <0x062ab118> (a java.util.TaskQueue)
at java.util.TimerThread.run(Timer.java:462)
"JarIndex Timer" daemon prio=6 tid=0x35556400 nid=0x2488 in Object.wait() [0x35d4f000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.util.TimerThread.mainLoop(Timer.java:509)
- locked <0x062206e0> (a java.util.TaskQueue)
at java.util.TimerThread.run(Timer.java:462)
"AWT-Windows" daemon prio=6 tid=0x354dd000 nid=0x1d0c runnable [0x3595f000]
java.lang.Thread.State: RUNNABLE
at sun.awt.windows.WToolkit.eventLoop(Native Method)
at sun.awt.windows.WToolkit.run(WToolkit.java:291)
at java.lang.Thread.run(Thread.java:619)
"AWT-Shutdown" prio=6 tid=0x354a1800 nid=0x268c in Object.wait() [0x3585f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:485)
at sun.awt.AWTAutoShutdown.run(AWTAutoShutdown.java:259)
- locked <0x062208d8> (a java.lang.Object)
at java.lang.Thread.run(Thread.java:619)
"Java2D Disposer" daemon prio=10 tid=0x354b7400 nid=0x5f4 in Object.wait() [0x3575f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
- locked <0x06220968> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
at sun.java2d.Disposer.run(Disposer.java:125)
at java.lang.Thread.run(Thread.java:619)
"Low Memory Detector" daemon prio=6 tid=0x00ee1000 nid=0x2664 runnable [0x00000000]
java.lang.Thread.State: RUNNABLE
"CompilerThread0" daemon prio=10 tid=0x00edc000 nid=0x1f6c waiting on condition [0x00000000]
java.lang.Thread.State: RUNNABLE
"Attach Listener" daemon prio=10 tid=0x00eda800 nid=0x206c runnable [0x00000000]
java.lang.Thread.State: RUNNABLE
"Signal Dispatcher" daemon prio=10 tid=0x00ed9400 nid=0xf64 waiting on condition [0x00000000]
java.lang.Thread.State: RUNNABLE
"Finalizer" daemon prio=8 tid=0x00ec6c00 nid=0x2348 in Object.wait() [0x34e7f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
- locked <0x061b0298> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
"Reference Handler" daemon prio=10 tid=0x00ec5800 nid=0x2484 in Object.wait() [0x34d7f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:485)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
- locked <0x061b0320> (a java.lang.ref.Reference$Lock)
"main" prio=6 tid=0x009f8000 nid=0x19e0 waiting on condition [0x00000000]
java.lang.Thread.State: RUNNABLE
"VM Thread" prio=10 tid=0x00ec1800 nid=0x22e0 runnable
"VM Periodic Task Thread" prio=10 tid=0x00eec000 nid=0x2604 waiting on condition
JNI global references: 5312
Heap
def new generation total 45376K, used 28499K [0x03080000, 0x061b0000, 0x061b0000)
eden space 40384K, 67% used [0x03080000, 0x04af44c0, 0x057f0000)
from space 4992K, 28% used [0x05cd0000, 0x05e30850, 0x061b0000)
to space 4992K, 0% used [0x057f0000, 0x057f0000, 0x05cd0000)
tenured generation total 604992K, used 364537K [0x061b0000, 0x2b080000, 0x2b080000)
the space 604992K, 60% used [0x061b0000, 0x1c5ae548, 0x1c5ae600, 0x2b080000)
compacting perm gen total 57344K, used 57260K [0x2b080000, 0x2e880000, 0x33080000)
the space 57344K, 99% used [0x2b080000, 0x2e86b348, 0x2e86b400, 0x2e880000)
No shared spaces configured.
Edited by: mdaly on May 21, 2010 11:42 AM

The cause of hang could be figured out from the thread dump.
I have fixed that in development code. It was happening from PL/SQL editor trying to create tooltip which locked up the connection.
I am not sure what would lead to memory bloat even if the tool is not in use. There could be memory leak from some component. I am investigating that.
Suggest you to keep ObjectViewers, reports & PL/SQL editor closed when not in use.
Have Sql Array Fetch Size preference to 50 if it's higher.
Do not have auto-refresh for Report editor.
Keep Sql History, Find Db Object, Snippets collapsed.
See if that helps.
-Raghu

I think I've got a memory leak and could use some advice

We've got ourselves a sick server/application and I'd like to gather a little community advice if I may. I believe the evidence supports a memory leak in my application somewhere and would love to hear a second opinion and/or suggestions.
The issue has been that used memory (as seen by FusionReactor) will climb up to about 90%+ and then the service will start to queue requests and eventually stop processing them all together. A service restart will bring everything back up again and it could run for 2 days or 2 hours before the issue repeats itself. Due to the inconsistant up time, I can't be sure that it's not some trouble bit of code that runs only occasionally or if it's something that's a core part of the application. My current plan is to review the heap graph on the "sick" server and look for sudden jumps in memory usage then review the IIS logs for requests at those times to try and establish a pattern. If anyone has some better suggestions though, I'm all ears! The following are some facts about this situation that may be usefull.
The "sick" server:
- CF 9.0.1.274733 Standard
- FusionReactor 4.0.9
- Win2k8 Web R2 (IIS7.5)
- Dual Xeon 2.8GHz CPUs
- 4GB RAM
JVM Config (same on "sick" and "good" servers):
- Initial and Max heap: 1536
-server -Xss10m -Dsun.io.useCanonCaches=false -XX:PermSize=192m -XX:MaxPermSize=256m -XX:+UseParNewGC -Xincgc -Xbatch -Dcoldfusion.rootDir={application.home}/../ -Dcoldfusion.libPath={application.home}/../lib -Dcoldfusion.dotnet.disableautoconversion=true
What I believe a "healthy" server graph should look like (from "good" server):
And the "sick" server graph looks like this:

@AmericanWebDesign, I would concur with BKBK (in his subsequent reply) that a more reasonable explanation for what you’re seeing (in the growth of heap) is something using and holding memory, which is not unusual for the shared variables scopes: session, application, and/or server. And the most common is sessions.
If that’s enough to get you going, great. But I suspect most people need a little more info. If this matter were easy and straightforward, it could be solved in a tweet, but it’s not, so it can’t.
Following are some more thoughts, addressing some of your concerns and hopefully pointing you in some new directions to find resolution. (I help people do it all the time, so the good news is that it can be done, and answers are out there for you.)
Tracking Session Counts
First, as for the observation we’re making about the potential impact of sessions, you may be inclined to say “but I don’t put that much in the session scope”. The real question to start with, though, is “how many sessions do you have”, especially when memory use is high like that (which may be different than how many you have right now). I’ve helped many people solve such problems when we found they had tens or hundreds of thousands of sessions. How can you tell?
a) Well, if you were on CF Enterprise, you could look at the Server Monitor. But since you’re not, you have a couple of choices.
b) First, any CF shop could use a free tool called ServerStats, from Mark Lynch, which uses the undocumented servicefactory objects in CF to report a count of sessions, overall and per application, within an instance. Get it here: http://www.learnosity.com/techblog/index.cfm/2006/11/9/Hacking-CFMX--pulling-it-all-togeth er-serverStats . You just drop the files (within the zip) into a web-accessible directory and run the one CFM page to get the answer instantly.
c) Since you mention using FusionReactor 4.0.9, here’s another option: those using FR 4 (or 4.5, a free update for you since you’re on FR 4) can use its available (but separately installed) FusionReactor Extensions for CF, a free plugin (for FR, at http://www.fusion-reactor.com/fr/plugins/frec.cfm). It causes FR to grab that session count (among many other really useful things about CF) to log it every 5 seconds, which can be amazingly helpful. And yes, FREC can grab that info whether one is on CF Standard or Enterprise.
And let’s say you find you do have tens of thousands of sessions (or more). You may wonder, “how does that happen?“ The most common explanation is spiders and bots hitting your site (from legit or unexpected search engines and others). Some of these visit your site perhaps daily to gather up the content of all the pages of your site, crawling through every page. Each such page hit will create a new session. For more on why and how (and some mitigation), see:
http://www.carehart.org/blog/client/index.cfm/2006/10/4/bots_and_spiders_and_poor_CF_perfo rmance
About “high memory”
All that said, I’d not necessarily conclude so readily that your “bad” memory graph is “bad”. It could just be “different”.
Indeed, you say you plan to “look for sudden jumps in memory usage“, but if you look at your “bad” graph, it simply builds very slowly. I’d think this supports the notion that BKBK and I are asserting: that this is not some one request that “goes crazy” and uses lots of memory, but instead is the “death by a thousand cuts” as memory use builds slowly. Even then, I’d not jump at a concern that “memory was high”.
What really matters, when memory is “high” is whether you (or the JVM) can do a GC (garbage collection) to recover some (or perhaps much) of that “high, used memory”. Because it’s possible that while it “was” in use in the past (as the graph shows), it might no longer be “in use” at the moment .
Since you have FR, you can use its “System Metrics page” to do a GC, using the trash can in the top left corner of the top right-most memory graph. (Those with the CFSM can do a GC on its “Memory Usage Summary” page, and SeeFusion users can do it on its front page.)
If you do a GC, and memory drops q lot, then you had memory that “had been” but no longer ”still was” in use, and so the high memory shown was not a problem. And the JVM can sometimes be lazy (because it’s busy) about getting to doing a GC, so this is not that unusual. (That said, I see you have added the Xincgc arg to your JVM. Do you realize that tells the JVM not to do incremental GCs? Do you really want that? I understand that people trade jvm args like baseball cards, trying to solve problems for each other, but I’d argue that’s not the place to start. In fact, rarely do I find myself that any new JVM args are needed to solve most problems.)
(Speaking of which, why did you set the – xss value? And do you know if you were raising or lowering it form the default?)
Are you really getting “outofmemory” errors?
But certainly, if you do hit a problem where (as you say) you find requests hanging, etc., then you will want to get to the bottom of that. And if indeed you are getting “outofmemory” problems, you need to solve those. To confirm if that’s the case, you’ll really want to look at the CF logs (specifically the console or “out” logs). For more on finding those logs, as well as a general discussion of memory issues (understanding/resolving them), see:
http://www.carehart.org/blog/client/index.cfm/2010/11/3/when_memory_problems_arent_what_th ey_seem_part_1
This is the first of a planned series of blog entries (which I’ve not yet finished) on memory issues which you may find additionally helpful.
But I’ll note that you could have other explanations for “hanging requests” which may not necessarily be related to memory.
Are you really getting “queued” requests?
You also say that “the service will start to queue requests and eventually stop processing them all together”. I’m curious: do you really mean “queuing”, in the sense of watching something in CF that tells you that? You can find a count of queued requests, with tools like CFSTAT, jrun metrics, the CF Server Monitor, or again FREC. Are you seeing one of those? Or do you just mean that you find that requests no longer run?
I address matters related to requests hanging and some ways to address them in another entries:
http://www.carehart.org/blog/client/index.cfm/2010/10/15/Lies_damned_lies_and_CF_timeouts
http://www.carehart.org/blog/client/index.cfm/2009/6/24/easier_thread_dumps
Other server differences
You presented us a discussion of two servers, but you’ve left us in the dark on potential differences between them. First, you showed the specs for the “sick” server, but not the “good” one. Should we assume perhaps you mean that they are identical, like you said the JVM.config is?
Also, is there any difference in the pattern of traffic (and/or the sites themselves) on the two servers? If they differ, then that could be where the explanation lies. Perhaps the sites on one are more inclined to be visited often by search engine spiders and bots (if they sites are more popular or just have become well known to search engines). There are still other potential differences that could explain things, but these are all enough to hopefully get you started.
I do hope that this is helpful. I know it’s a lot to take in. Again, if it was easier to understand and explain, there wouldn’t be so much confusion. I do realize that many don’t like to read long emails (let alone write them), which only exacerbates the problem. Since all I do each day is help people resolve such problems (as an independent consultant, more at carehart.org/consulting), I like to share this info when I can (and when I have time to elaborate like this), especially when I think it may help someone facing these (very common) challenges.
Let us know if it helps or raises more questions. :-)
/charlie

Aggregate Storage And Multi-Threading/Multi-Core Systems

Please pardon if this question has been asked before, but the Forum search is not returning any relevant results.
We are in the process of purchasing hardware for an 11.1.2 Essbase environment. We are going 64-bit, on Windows 2008, with either 32 GB or 64 GB of system RAM. The debate we are having is the number of CPUs and cores per CPU. We have not built any ASO databases as of yet, but we plan to launch a major BSO to ASO conversion project once 11.1.2 is off the ground here.
Historically, with BSO, we did not see performance improvements significant enough to justify the cost of additional CPUs when we ran calcs on multi-CPU systems vs. single or dual CPU systems, even when the settings and design should have taken the most advantage of BSO's multi-threading capabilities. However, it would seem that ASO's design may be able to make better use of multi-core systems.
I know that there are a lot of factors behind any system's performance, but in general, is ASO in 11.1.2 written well enough to make it worthwhile to consider, say, a four CPU, total 16 core system vs. a 2 CPU, total four core system?

Grand central dispatch - infancy, not really doing its job, and I don't think apps have to be specifically written for HT, but they do have to not do things that they use to - prevent threads from going to sleep! or be parked.
high usage is not necessarily high efficiency. often the opposite.
Windows 7 seems to be optimized for multi-core thanks to a lot of reworking. Intel wants and knows it isn't possible to hand code, that the hardware has to be smarter, too. But the OS has a job, and right now I don't think it does it properly. Or handle memory.
Gulftown's 12MB cache will help, and over all should be 20% more efficient doing its work.
With dual processors, and it doesn't look like there are two quick path bridges, data shuffling has led to memory thrashing. Use to be page thrashing with not enough memory. Then core thrashing but having the cores, but not integrated (2008 is often touted as being greatest design so far, but it was FOUR dual-cores, 2009 was the first with a processor that really was new design and (native) 4-core.
One core should be owned by the OS so it is always available for its own work and housekeeping.
The iTunes audio bug last year showed how damaging and not to implement code and how a thread could usurp processing and add a high cpu temperature while basically doing nothing, sort of a denial of service attack on the processor - those 80*C temps people had.
All those new technology features under development and not like OpenCL, GCD and even OpenGL are tested, mature but rather 1.0 foundation for the future. A year ahead of readiness.

Firefox has a memory leak and I need to update it, but I want to keep 3.5 because I don't like how the newest version of Firefox is set up.

My computer is running low on RAM, and when I look at what processes are using the most memory, firefox is the number one using between 28,000 to 93,000k, so I'm guessing that it has a memory leak.
And because of that memory leak I have to update firefox, however I really dislike the newest version of firefox and I'd prefer to stick with the version I have, which is 3.5.

Often the memory problems are not just from Firefox in isolation, but partly relating to all the extensions available for it and then the videos and animations it runs on media rich sites.
The first thing to do is to upgrade to firefox 3.6 which is at least a supported version (Maybe not for much longer)
* see [[updating firefox]]
Next version after 3.6 is 4, you should avoid that, it did have some memory problems, that were worse than 3,6 and firefox 4 is no longer secure or supported.
The techies at Firefox have been working on memory problems recently and have made many improvements, but some of these improvements are only seen in the trial versions of Firefox.
I would in fact suggest you upgrade to Firefox 5 the current release version (soon to be replaced with Firefox 6)
I am able to run Firefox v3.6 to v8 on legacy XPs with less than 1GB RAM. Firefox in itself is not necessarily very demanding in terms of RAM. I am not sure what the figures are you are quoting, or whether they are high. ( Note 1Gb is in the order of 1 000 000 k )
As for not liking the set-up of new versions of Firefox, there is quite abit that can be changed, maybe you would be able to configure it more to your liking with little effort.

Memory leak and char[] ?

Hello all,
I'm not sure whether this post should be here or in WebLogic section, so correct me if I'm wrong.
I'm working on JDeveloper 11.1.1.3 while deployments are made on standalone WebLogic 10.3.3. This thing occurred in previous versions also.
With every deployment WebLogic increases it's used memory until the famous PermGen space error, which is after about 5-6 deployments.
I'm doing my best to understand how to use memleak detection tools. I've switched JDev and WL from Sun jdk which was used before to JRockit, same thing happens. Both JDev's memory profiler and JRockit mission control show something that I really do not understand. char[] uses around 30% of heap space and keeps growing with deployments, next is String with 8%. I never use char in app.
Am I looking at the wrong thing? Is it normal for char[] to increase on WebLogic on deployments? Does anyone know how to check other things and what to check? Someone on other forums mentioned it would be useful to check if ApplicationContext keeps initializing over again on deployments. Does anyone know how to check this?
One more thing, I have successfully deployed app on Tomcat, and Tomcat said there is a memory leak in app, but could not tell anything specific.
I'm kinda lost in this :(

It is normal for the PermGen space of the Sun's JVM to get filled after several re-deployments. PermGen stands for "permanent generational". This space is used by classes that is unlikely to need to be garbage-collected, so they are placed in this memory space that is never garbage-collected (for example, the Class instances). When you redeploy an application, a new class loader instance is used and it instantiates new Class instances that fill up the PermGen space. But why this happens on JRockit either, I could not explain.
We have experienced memory leaks related to classes and components that use native memory. For example, we have had significant memory leak when using Oracle's JDBC OCI driver. We were not able to solve this problem, so we switched to JDBC Thin driver (which is very performant and stable today comparing to some years ago). If you are using Oracle JRockit, you can monitor the overall memory usage by the following JRockit command executed at OS command line:
jrcmd <jrockit_pid> print_memusage>where <jrockit_pid> should be replaced by the JVM process ID.
If you suspect existence of native memory leaks, then have a look at the article Thanks for the memory for explanations about how Java uses native memory.
Dimitar

Indesign and multi threaded cpu support??????????

When the indesign will finally support multi-core processors?????? It is tragic that adobe dont have any support for multi-core cpu and that this products cost thousends $$$$$!!!!!!!!!!!!!!! Only premiere and some photoshop function support multi-core cpu.

If you are good freelancer you can get money spent on CS back in a month. So I would not call this software expensive. What concerns multi threaded cpu support I believe that programming tools as well as operating systems need to evolve. I am sure that we will get better support in this matter in close future.

Memory leak using 10.2.0.3 OCI client on Solaris

Hi,
We are using OCI client libraries to connect our C++ program to the Oracle Database. The program does a lot of selects, inserts and SP calls.
Oracle client and Oracle server both are 10.2.0.3.
We have been observing a memory leak of 4M bytes in the C++ program every few minutes since last few days. On debugging through Purify, libumem, and Sun Studio 12, we finally managed to narrow down the problem to the Oracle client library OCI calls.
The Sun Studio leak check shows the following -
Leak #37, Instances = 157, Bytes Leaked = 655004
kpummapg + 0x00000098
kghgex + 0x00000648
kghfnd + 0x000005BC
kghalo + 0x00000A6C
kghgex + 0x000003BC
kghfnd + 0x000005BC
kghalo + 0x00000A6C
kghgex + 0x000003BC
kghfnd + 0x000005BC
kghalo + 0x00000A6C
kpuhhalo + 0x00000558
kpugdesc + 0x00000AD4
kpugparm + 0x00000374
COCIResultSet::InterpretData() + 0x000001B4
COCIResultSet::COCIResultSet(COCIStatement*,OCIStmt*,OCIError*) + 0x000000A4
COCIStatement::PrepareResult() + 0x00000190
A select is executed, a resultset is fetched and the resultset is immeidately closed. The same piece of code has been running at various production systems without any problems. Most of the other sites are either 10.2.0.4 or 9i.
On searching Metalink and various other forums, I found similar issues faced in 10.2.0.1.
Could someone advise if there are any bugs corresponding to this which have been closed. Would upgrading to 10.2.0.4 solve the problem?
Thanks.

Hi,
Apparently a similar issue is being discussed over here:
Re: Memory Leak
Hope it helps.
Regards,
Naveed.

Memory leak using 10.2.0.3 OCCI client on Solaris 10

Hi,
We are using OCCI client libraries to connect our C++ program to the Oracle Database. The program does a lot of selects, inserts and SP calls.
Oracle client and Oracle server both are 10.2.0.3 on Solaris 10.
We have been observing a memory leak of 4M bytes in the C++ program every few minutes since last few days. On debugging through Purify, libumem, and Sun Studio 12, we finally managed to narrow down the problem to the Oracle client library OCI calls.
The Sun Studio leak check shows the following -
Leak #37, Instances = 157, Bytes Leaked = 655004
kpummapg + 0x00000098
kghgex + 0x00000648
kghfnd + 0x000005BC
kghalo + 0x00000A6C
kghgex + 0x000003BC
kghfnd + 0x000005BC
kghalo + 0x00000A6C
kghgex + 0x000003BC
kghfnd + 0x000005BC
kghalo + 0x00000A6C
kpuhhalo + 0x00000558
kpugdesc + 0x00000AD4
kpugparm + 0x00000374
COCIResultSet::InterpretData() + 0x000001B4
COCIResultSet::COCIResultSet(COCIStatement*,OCIStmt*,OCIError*) + 0x000000A4
COCIStatement::PrepareResult() + 0x00000190
A select is executed, a resultset is fetched and the resultset is immeidately closed. The same piece of code has been running at various production systems without any problems. Most of the other sites are either 10.2.0.4 or 9i.
On searching Metalink and various other forums, I found similar issues faced in 10.2.0.1.
Could someone advise if there are any bugs corresponding to this which have been closed. Would upgrading to 10.2.0.4 solve the problem?
Thanks.

Please ... one post and one post only in the group most appropriate to your inquiry. Please open an SR at metalink.

Possible memory leak in Oracle 12.1.0 C client

Dear Oracle Users and Professionals,
I want to report Oracle 12.1.0 C client memory leak when reconnect feature is on place. I have used Valgrind/massif tool to diagnostic our components and there was small memory leak in libclntsh.so.12.1 which is calling libc function getaddrinfo(). This seems to be not freed when connection is closed, but my application is still running and keep reconnect when needed.
I sought a bit on internet and Oracle Portals about this and did not find any information that some has detected this particular issue.
In the attachment is trace back from massif: comparison of two different time slots.
We are developers and use only free available Oracle client versions. Our customer which will operate the system has available whole Oracle Support.
If you can give me advice, to reach state where we will have no memory leak, it would be helpfull.
Thank you very much
Jan Kianicka
([email protected])

Hi Jan,
This forum is for questions about connecting to non-Oracle databases. For questions about the Oracle client connecting to Oracle databases then try either one of these forums - I am not sure which will be best -
ODBC
or
General Database Discussions
Regards,
Mike

Flash player 11.6 r602 memory leak and crash in FF 19.0

I have seen similar questions like this but have never witnessed it myself until today when Flash updated on FF 19.0. I'd like to see if this is Firefox or Adobe as the later is quick to say "this is normal".
I watch two streams (uStream and live.twit.tv) almost all the time that use flash on both sites. Usually it caps out at around 250MB and worked just fine this morning on uStream and is stable. Just got the Flash 11.6 update and neither currently work and will lock-up Firefox and eventually crash Adobe, which then frees up Firefox to allow me to use it again. It slowly creeps up to 1.9G before Adobe crashes.
I have tried, as suggested elsewhere on a very similar issue, to roll back to Adobe 10, add "ProtectedMode = 0" to the mms.cfg file in the macromed folders, and disabling hardware acceleration in Firefox options. This allowed Firefox to play flash media, but only after it as reached 2.8G of memory on an 8G physical memory machine (Adobe claims 10% is normal, which this is far beyond 10% of 8G)
I'd be quicker to blame Adobe on this, but I just got Firefox 19 the past 7 days, Adobe had always worked on Firefox before this update, but now even rolling back doesn't seem to work well at all. I'm not sure how to post my reports from about:crashes here, but...
bp-492ad7e0-2bf8-46cb-b558-596252130228 2/27/20134:01 PM
...is my latest (Eleven reports today). I have screenshots of both Adobe v10 and v11 leaking memory, but don't feel it's useful at this time.
Any help would be awesome and if it's not Firefox at all I guess I'll head back to Adobe with some more meat and potatoes for a more thorough support ticket over there. I just don't like having to use Chrome since it seems to work just fine on these pages ;)

Thanks for your prompt and helpful reply.....
When dealing with such a large problem with frequent FF lockups the temptation is to lump all information in an attempt to solve. LOL
Chasing multiple threads to help solve the problem may be helpful to the developers but it takes far too much time following and posting in each thread. As you can see it's taken a couple of days to get back to this post.
First thing we did is dump cache and cookies both through the interface and then manually in the profile. We changed the version of Flash installed manually and even changed the version of FF. There are many "flash" enabled pages we encountered which caused the lockup.....so MSN is not specifically the issue.
But when Flash is removed or disabled the browser no longer locks up.....suffice to say we get an error when visiting a website with flash content on it.
That is why I chose to post here as the problem is directly attributable to Flash in FF on all of our machines.
Paul

Memory leaks and multi threading issues in managed client.

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