Performance bottleneck in Service.poll

In running a performance evaluation of the Coherence software I'm seeing almost all threads blocked waiting in Service.poll as illustrated in the thread dump below. This particular thread dump is spawned from a call to NamedCache.put( org.apache.commons.collections.keyvalue.MultiKey, Object ). My app (deployed in WLS) is chugging at 150% CPU (on a 24CPU machine) and is giving me about 2.5tps.
     "ExecuteThread: '5' for queue: 'oms.xml'" daemon prio=5 tid=0x013bb138 nid=0x11 in Object.wait() [70c7e000..70c7
     fc28]
     at java.lang.Object.wait(Native Method)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.Service.poll(Service.CDB:26)
     - locked <0x82145d10> (a com.tangosol.coherence.component.net.message.requestMessage.DistributedCacheKey
     Request$Poll)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.Service.poll(Service.CDB:1)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.DistributedCache$BinaryMap.put(Di
     stributedCache.CDB:33)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.DistributedCache$BinaryMap.put(Di
     stributedCache.CDB:1)
     at com.tangosol.util.ConverterCollections$ConverterObservableMap.put(ConverterCollections.java:1878)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.DistributedCache$ViewMap.put(Dist
     ributedCache.CDB:1)
     at com.tangosol.coherence.component.util.SafeNamedCache.put(SafeNamedCache.CDB:1)
     at com.tangosol.net.cache.CachingMap.put(CachingMap.java:882)
     at com.tangosol.net.cache.CachingMap.put(CachingMap.java:805)
     at com.tangosol.net.cache.CachingMap.put(CachingMap.java:742)
     I have a near scheme configured with a local scheme fronting a distributed scheme.
     Any suggestions on how to alleviate this bottleneck?
     Regards, San

Ahh, it definitely looks like things are all blocking on a single daemon thread than:
     One of these before each of the following:
     "DistributedCache:EventDispatcher" daemon prio=5 tid=0x0152b068 nid=0x130 in Object.wait() [6347f000..6347fc28]
     at java.lang.Object.wait(Native Method)
     at com.tangosol.coherence.component.util.Daemon.onWait(Daemon.CDB:9)
     - locked <0xa34960f0> (a com.tangosol.coherence.component.util.daemon.queueProcessor.Service$EventDispat cher$Queue)
     at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:31)
     at java.lang.Thread.run(Thread.java:534)
     "DistributedCache" daemon prio=5 tid=0x0116f828 nid=0x12f runnable [6227e000..6227fc28]
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Class.java:219)
     at com.tangosol.net.ResolvingObjectInputStream.resolveClass(ResolvingObjectInputSt ream.java:57)
     at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1513)
     at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1435)
     at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1521)
     at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1435)
     at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1626)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
     at java.util.HashSet.readObject(HashSet.java:276)
     at sun.reflect.GeneratedMethodAccessor45.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.ja va:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:838)
     at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1746)
     at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
     at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
     at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
     at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
     at com.tangosol.util.ExternalizableHelper.readSerializable(ExternalizableHelper.ja va:1626)
     at com.tangosol.util.ExternalizableHelper.readObject(ExternalizableHelper.java:174 3)
     at com.tangosol.util.ExternalizableHelper.fromBinary(ExternalizableHelper.java:187 )
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache$ConverterFromBinary.convert(DistributedCache.CDB:4)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache$Storage$BinaryEntry.getValue(DistributedCache.CDB:9)
     at com.tangosol.util.filter.ExtractorFilter.evaluateEntry(ExtractorFilter.java:78)
     at com.tangosol.util.filter.AllFilter.evaluateEntry(AllFilter.java:75)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache$Storage.query(DistributedCache.CDB:107)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache.onQueryRequest(DistributedCache.CDB:25)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache$QueryRequest.run(DistributedCache.CDB:1)
     at com.tangosol.coherence.component.net.message.requestMessage.DistributedCacheReq uest.onReceived(DistributedCacheRequest.CDB:12)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.Service.onMessage(S ervice.CDB:9)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.Service.onNotify(Se rvice.CDB:103)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache.onNotify(DistributedCache.CDB:3)
     at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:34)
     at java.lang.Thread.run(Thread.java:534)
     "DistributedCache" daemon prio=5 tid=0x0116f828 nid=0x12f runnable [6227f000..6227fc28]
     at java.io.ObjectStreamClass.getReflector(ObjectStreamClass.java:1923)
     - waiting to lock <0xa02a04e0> (a sun.misc.SoftCache)
     at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:501)
     at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1521)
     at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1435)
     at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1626)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
     at java.util.HashSet.readObject(HashSet.java:276)
     at sun.reflect.GeneratedMethodAccessor45.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.ja va:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:838)
     at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1746)
     at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
     at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
     at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
     at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
     at com.tangosol.util.ExternalizableHelper.readSerializable(ExternalizableHelper.ja va:1626)
     at com.tangosol.util.ExternalizableHelper.readObject(ExternalizableHelper.java:174 3)
     at com.tangosol.util.ExternalizableHelper.fromBinary(ExternalizableHelper.java:187 )
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache$ConverterFromBinary.convert(DistributedCache.CDB:4)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache$Storage$BinaryEntry.getValue(DistributedCache.CDB:9)
     at com.tangosol.util.filter.ExtractorFilter.evaluateEntry(ExtractorFilter.java:78)
     at com.tangosol.util.filter.AllFilter.evaluateEntry(AllFilter.java:75)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache$Storage.query(DistributedCache.CDB:107)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache.onQueryRequest(DistributedCache.CDB:25)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache$QueryRequest.run(DistributedCache.CDB:1)
     at com.tangosol.coherence.component.net.message.requestMessage.DistributedCacheReq uest.onReceived(DistributedCacheRequest.CDB:12)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.Service.onMessage(S ervice.CDB:9)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.Service.onNotify(Se rvice.CDB:103)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache.onNotify(DistributedCache.CDB:3)
     at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:34)
     at java.lang.Thread.run(Thread.java:534)
     "DistributedCache" daemon prio=5 tid=0x0116f828 nid=0x12f runnable [6227f000..6227fc28]
     at java.lang.String.intern(Native Method)
     at java.io.ObjectStreamField.(ObjectStreamField.java:84)
     at java.io.ObjectStreamClass.readNonProxy(ObjectStreamClass.java:543)
     at java.io.ObjectInputStream.readClassDescriptor(ObjectInputStream.java:762)
     at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1503)
     at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1435)
     at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1626)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
     at com.tangosol.util.ExternalizableHelper.readSerializable(ExternalizableHelper.ja va:1626)
     at com.tangosol.util.ExternalizableHelper.readObject(ExternalizableHelper.java:174 3)
     at com.tangosol.util.ExternalizableHelper.fromBinary(ExternalizableHelper.java:187 )
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache$ConverterFromBinary.convert(DistributedCache.CDB:4)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache$Storage$BinaryEntry.getValue(DistributedCache.CDB:9)
     at com.tangosol.util.filter.ExtractorFilter.evaluateEntry(ExtractorFilter.java:78)
     at com.tangosol.util.filter.AllFilter.evaluateEntry(AllFilter.java:75)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache$Storage.query(DistributedCache.CDB:107)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache.onQueryRequest(DistributedCache.CDB:25)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache$QueryRequest.run(DistributedCache.CDB:1)
     at com.tangosol.coherence.component.net.message.requestMessage.DistributedCacheReq uest.onReceived(DistributedCacheRequest.CDB:12)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.Service.onMessage(S ervice.CDB:9)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.Service.onNotify(Se rvice.CDB:103)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Distributed Cache.onNotify(DistributedCache.CDB:3)
     at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:34)
     at java.lang.Thread.run(Thread.java:534)
     We'll try incrementing the thread-count.

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System + Parameters:
JVM-64bit JDK1.6.0_14
-Xmx3g
Why the executing of one thread is faster as executing of many threads?
As you can see I didn't use any synchronization.
Maybe I have to configure JVM in some way to gain wished performance (I expected the performance gain on i7 x8 times) ?

Hello,
I'm from [happy-guys|http://www.happy-guys.com] , and we developed new sorting-algorithm to sort an array on the multi-core machine.
But after the algorithm was implemented it was a little-bit slower as standard sorting-algorithm from JDK (Array.sort(...)). After searching for the reason, I created performance tests which shows that the arrays in Java don't allow to access them by many threads at the same time.
The bad news is: different threads slowdown each-other even if they use different array-objects.
I believe all array-objects are natively managed by a global manager in JVM, thus this manager builds a global-lock for all threads.
Only one thread can access any array at the same time!
I used:
Software:
1)Windows Vista 64bit,
2) java version "1.6.0_14"
Java(TM) SE Runtime Environment (build 1.6.0_14-b08)
Java HotSpot(TM) 64-Bit Server VM (build 14.0-b16, mixed mode)
Hardware:
Intel(R) Core(TM) i7 CPU 920 @ 2,67GHz 2,79 GHz, 6G RAM
Test1: initialization of array in a single thread
Test2: the array initialization in many threads on the single array
Test3: array initialization in many threads on many arrays
Results in ms:
Test1 = 5588
Test2 = 4976
Test3 = 5429
Test1:
package org.happy.concurrent.sort.forum;
* simulates the initialization of array in a single thread
* @author Andreas Hollmann
public class ArraySingleThread {
     public static void main(String[] args) throws InterruptedException {
          final int arrayLength = (int)2e7;
          long startTime;
                * init array in single thread
               Integer[] a1 = new Integer[arrayLength];
               startTime = System.currentTimeMillis();
               for(int i=0; i<arrayLength; i++){
                    a1[i] = i;
               System.out.println("single thread=" + (System.currentTimeMillis()-startTime));
}Test2:
package org.happy.concurrent.sort.forum;
import java.util.ArrayList;
import java.util.List;
* simulates the array initialization in many threads on the single array
* @author Andreas Hollmann
public class ArrayManyThreads {
     public static void main(String[] args) throws InterruptedException {
          final int arrayLength = (int)2e7;
          final int threadNumber = Runtime.getRuntime().availableProcessors();
          long startTime;
          final int offset = arrayLength/threadNumber;
                * init array in many threads
               final Integer[] a = new Integer[arrayLength];
               List<Thread> threadList = new ArrayList<Thread>();
               for(int i=0; i<threadNumber; i++){
                    final int iF = i;
                    Thread t = new Thread(new Runnable(){
                         @Override
                         public void run() {
                              int end = (iF+1)*offset;
                              if(iF==(threadNumber-1))
                                   end = a.length;
                              for(int i=iF*offset; i<end; i++){
                                   a[i] = i;
                    threadList.add(t);
               startTime = System.currentTimeMillis();
               for(Thread t:threadList)
                    t.start();
               for(Thread t:threadList)
                    t.join();
               System.out.println("many threads List=" + (System.currentTimeMillis()-startTime));
}Test3:
package org.happy.concurrent.sort.forum;
import java.util.ArrayList;
import java.util.List;
* simulates the array initialization in many threads on many arrays
* @author Andreas Hollmann
public class ArrayManyThreadsManyArrays {
     public static void main(String[] args) throws InterruptedException {
          final int arrayLength = (int)2e7;
          final int threadNumber = Runtime.getRuntime().availableProcessors();
          long startTime;
          final int offset = arrayLength/threadNumber;
                * init many arrays in many threads
               final ArrayList<Integer[]> list = new ArrayList<Integer[]>();
               for(int i=0; i<threadNumber; i++){
                    int size = offset;
                    if(i<(threadNumber-1))
                         size = offset + arrayLength%threadNumber;
                    list.add(new Integer[size]);
               List<Thread> threadList = new ArrayList<Thread>();
               for(int i=0; i<threadNumber; i++){
                    final int index = i;
                    Thread t = new Thread(new Runnable(){
                         @Override
                         public void run() {
                              Integer[] a = list.get(index);
                              int value = index*offset;
                              for(int i=0; i<a.length; i++){
                                   value++;
                                   a[i] = value;
                    threadList.add(t);
               startTime = System.currentTimeMillis();
               for(Thread t:threadList)
                    t.start();
               for(Thread t:threadList)
                    t.join();
               System.out.println("many threads - many List=" + (System.currentTimeMillis()-startTime));
}

Threadlock at daemon.queueProcessor.Service.poll

Hi,
We have a situation in a production environment where the Tangosol queue processor thread is waiting (locked) during a routine get call. This is happening with version 3.2.2.There is also a write through backing store configured for the distributed caches. Any insights would be helpful.The thread dump is shown below
Sincerely,
Pranab
TIBCO Software Inc.
State: WAITING on com.tangosol.coherence.component.util.daemon.queueProcessor.service.DistributedCache$GetRequest$Poll@43d589
Total blocked: 4,874 Total waited: 3,220,986
java.lang.Object.wait(Native Method)
com.tangosol.coherence.component.util.daemon.queueProcessor.Service.poll(Service.CDB:27)
com.tangosol.coherence.component.util.daemon.queueProcessor.Service.poll(Service.CDB:1)
com.tangosol.coherence.component.util.daemon.queueProcessor.service.DistributedCache$BinaryMap.get(DistributedCache.CDB:27)
com.tangosol.util.ConverterCollections$ConverterMap.get(ConverterCollections.java:1300)
com.tangosol.coherence.component.util.daemon.queueProcessor.service.DistributedCache$ViewMap.get(DistributedCache.CDB:1)
com.tangosol.coherence.component.util.SafeNamedCache.get(SafeNamedCache.CDB:1)
com.tangosol.net.cache.CachingMap.get(CachingMap.java:484)
com.xxx.ObjectCache.getObject(ObjectCache.java:64)

Hi Pranab,
The thread dump you posted is perfectly normal - that is how it always looks when a client thread awaits a response from a cache server.
If you believe that you encountered an abnormal Coherence behavior, please send the entire thread dump (preferably from both client and server tier) to Coherence support at Oracle Metalink (http://metalink.oracle.com)
Regards,
Gene

Performance bottleneck of hard drive: assets vs. cache vs. render-to drive?

so i'm beefing up my old mac pro tower (5,1) and was wondering which combination of use of hard drives is fastest, if anyone has any firsthand or theoretical suggestions...
if someone has all three of these hard drives:
A) PCIe SSD (OWC Mercury Accelsior_E2 PCI Express SSD)
B) internal drive bay SSD
C) external SSD connected via 600MB/s eSATA port of the above linked card
… which is best to use in combination for the following in After Effects CC/CC2014?
1) storage of assets files used in the AE project (ie. 1080/4k/RAW/etc footage, PSD files)
2) AE disk cache
3) the drive that AE is rendering to
… for example is 1A + 2C + 3B the fastest use for rendering? and is 1AC + 2B the fastest for while working in AE?
between assets, disk cache, and render location, which are more of a performance bottleneck?
and does the optimal combination vary if someone had 16 GB vs 64GB vs 128GB of RAM?
thanks in advance for any insight!

Well, the long and short answer is: It won't matter. All your system buses only have so much overall transfer bandwith and ultimately they all end up being in some way piped through your PCI bus, which in addition is shared by your graphics card, audio devices and what have you as well. There are going to be wait states and data collisions and whether or not you can make your machine fly to Mars is ultimately not relevant. There may be perhaps some tiny advantage in using a native PCI card SSD for Cache, but otherwise the overall combined data transfer rates will be way above and beyond what your system can handle, so it will put in the throttle one way or the other.
Mylenium

Not able to perform j1iex for service tax capturing

The service PO is similar to that of any other PO in terms of taxing.
In service tax we will have
Service tax          - 12 %
Education cess          - 2 %
Surcharge          - 1%
So for service tax code we will be maintaining three rates in the Tax code.
Follow the below process for Service Cycle :-
1. AC01 - Create Service master in AC01 and assign the Valuation Class for the Service Masters and do Account
                 Determination in OBYC for A/c Key GBB and Valuation Modifier VBR (to this Assign the Service Expense A/c) and
                 for A/c Key WRX, assign GR/IR Clearing A/c
2. ME21N - In PO (ME21N), use Item category as "D" (Services) along with Account Assignment Category "K" (Cost Center)
                    and In "Services" tab, specify the Service Master and pricing details
3. ML81N - Create Service Entry Sheet w.r.t. Service PO
Service Expense A/c - Dr
GR/IR Clearing A/c - Cr
4. MIRO - LIV for Service Entry Sheet or Service PO
Service Vendor A/c - Cr
GR/IR Clearing A/c - Dr
Service Tax A/c - Dr
Ed Cess on Service tax - Dr
Sec Ed Cess on Service tax - Dr
In normal purchase order having excise duty we would perform a t.code j1iex once for capturing excise and again for posting excise duty.
we want same step between step 3 and step 4 for service tax also. can anyone tell us how to achive that.

Hi
We dont have the provision to maintain registers for service tax.
so there is no question of capturing service tax thro J1IEX.
Service tax is posted to a G/L account at the time of MIRO.
We will utilize this service tax input credit at the time of monthly utilization (J2IUN) where in there is option for giving this G/L account.
then the amounts of input service tax will be populated in the screen.
regards
prasad

Performance bottleneck in Service.poll

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