Heap Memory Increases to Maximum

Hi,
I am new to weblogic Server.
My problem is the used heap size keeps increasing till the maximum(1GB) and then Garbage collection happens, once GC happens the used heap comes down to 250MB
and it continuously goes though this cycle, even if no application is actively running on the server.
Is this normal, this is the way it would work?
current Setup
-Xms1024m
-Xmx1024m
-XX:MaxPermSize=256m
Weblogic 10.0
No maintenance pack installed
AIX and IBM Java 5
I got Out of memory when I Had the application running, but the same application running in local system (Tomcat winxp 512MB, where I simulate the load also) did not throw OOM error.
So the possibility of memory leak by application is very less(I will investigate that also later) but I need to confirm if any fine tuning is required for the above setup
Please help me to identify the problem.
Thanks
Edited by: Kannan Mugundan on Jan 28, 2010 9:38 PM

You need to do a stress test with the current JVM, as each JVM behaves differently over stress test and based on the values we can tune the JVM for optimal settings
The below settings may be used as a starting point in debugging this issue.
-XX:NewSize=256m -XX:MaxNewSize=256m -XX:SurvivorRatio=8 -Xmn256m -Xms1024m -Xmx1024m
I hope it works for you.

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can I increase heap memory without specify any class or jar file??
thx

chiara wrote:
Hi,
I tried to increase my heap memory in this way :
java -Xms256m -Xmx256m
but I got an error ... it's seem that I must specify a class java or a .jar file ...
This is the error :
Usage: java [-options] class [args...]
(to execute a class)
or java [-options] -jar jarfile [args...]
(to execute a jar file)
can I increase heap memory without specify any class or jar file??The job of java.exe is to execute java bytecode.
What is it supposed to do with your request to use 256m of memory for heap
when you are not giving it a class or a jar to run?

How do I increase the maximum number of images I can acquire in a sequence using the IMAQ 1424 with 80 MB of onboard memory and a Duncan Tech camera?

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It sounds like you are already bypassing the onboard memory. If you weren't, you would only be able to acquire about 20 images.
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Bruce Ammons
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Memory Increase - MacBook Pro mid-2012...?

Hello to all who reads this post…
I’m wondering if it's possible to upgrade the memory in my mid-2012 MacBook Pro...?
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http://support.apple.com/en-us/HT1270
Do any of the guru's here know how much, (if any), memory I can add to the 8 gigs of RAM currently installed?
If so, what brand of memory and how much of a memory expansion would be best to boost the speed of my MacBk?
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OS X Yosemite Version 10.10.2
MacBook Pro (13-inch, Mid 2012)
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Graphics Intel HD Graphics 4000 1024 MB
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Manufacturer: 0x80AD
Part Number: 0x484D54333531533643465238432D50422020
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Manufacturer: 0x80AD
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AND of course the specs page on Apple: http://support.apple.com/en-us/HT1270
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MacBook Pro (13-inch, mid 2012)
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Hello to all who read this post…
I’m wondering if it's possible to upgrade the memory in my mid-2012 MacBook Pro...?
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& reviewing my systems specs pages here and there, I've become less sure of the possibility to increase the RAM.
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http://support.apple.com/en-us/HT1270
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MB-Pro details:
OS X Yosemite Version 10.10.2     MacBook Pro (13-inch, Mid 2012)
Processor 2.9 GHz Intel Core i7      Memory 8 GB 1600 MHz DDR3
Graphics Intel HD Graphics 4000    1024 MB
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SMC Version (system): 2.2f44
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Size: 4 GB                          Type: DDR3          Speed: 1600 MHz               Status: OK
Manufacturer: 0x80AD        Part Number: 0x484D54333531533643465238432D50422020
BANK 1/DIMM0:
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Memory Slots:                  ECC: Disabled                       Upgradeable Memory: Yes
Intel 7 Series Chipset:     Product: 7 Series Chipset      Link Speed: 6 Gigabit        Negotiated Link Speed: 3 Gigabit
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BSD Name: disk0                                                       Rotational Rate: 5400                    Medium Type: Rotational
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MacBook Pro (13-inch, mid 2012)
Number of memory slots
2
Base memory
4 GB
Maximum memory
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Memory card specifications
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A mid 2012 MBP will accept up to 16 GB RAM (even though Apple says 8 GB). The specifications are:204-pin PC3-12800 (1600 MHz) DDR3 SO-DIMM. The best sources of Mac compatible RAM are OWC and Crucial.
Look at this video for installation instructions:
http://eshop.macsales.com/installvideos/macbookpro_13_unibody_mid12_mem/
You will need a #00 Phillips driver to take off the bottom panel.
Ciao.

Find heap memory Size for Web Intelligence processing server in BO 4.0

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Hi Abhinav,
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OAS Heap memory issue: An error "java.lang.OutOfMemoryError: GC overhead

OAS - 10.1.3.4.0
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below is an example of what we see in a file created in the OPMN log folder on the JAS server then this occurs. I think this is the log created when Verbose GC is turned on. I can send you the full log or anything else you need. Thanks
1194751K->1187561K(1365376K), 4.6044738 secs]
java.lang.OutOfMemoryError: GC overhead limit exceeded
Dumping heap to java_pid10644.hprof ...
[Full GC 1194751K->1188321K(1365376K), 4.7488200 secs]
Heap dump file created [1326230812 bytes in 47.602 secs]
[Full GC 1194751K->1177641K(1365376K), 5.6128944 secs]
[Full GC 1194751K->986239K(1365376K), 4.6376179 secs]
[Full GC 1156991K->991906K(1365376K), 4.5989155 secs]
[Full GC 1162658K->1008331K(1365376K), 4.1139016 secs]
[Full GC 1179083K->970476K(1365376K), 4.9670050 secs]
[GC 1141228K->990237K(1365376K), 0.0561096 secs]
[GC 1160989K->1012405K(1365376K), 0.0920553 secs]
[Full GC 1012405K->1012274K(1365376K), 4.1170216 secs]
[Full GC 1183026K->1032000K(1365376K), 4.4166454 secs]
[Full GC 1194739K->1061736K(1365376K), 4.4009954 secs]
[Full GC 1194739K->1056175K(1365376K), 5.1124431 secs]
[Full GC 1194752K->1079807K(1365376K), 4.5160851 secs]
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[Full GC 1194751K->1194751K(1365376K), 4.6785776 secs]
[Full GC 1194751K->1188062K(1365376K), 5.4413659 secs]
[Full GC 1194751K->1194751K(1365376K), 4.5800033 secs]
[Full GC 1194751K->1194751K(1365376K), 4.4951213 secs]
[Full GC 1194751K->1194751K(1365376K), 4.5227857 secs]
[Full GC 1194751K->1171773K(1365376K), 5.5696274 secs]
11/07/25 11:07:04 java.lang.OutOfMemoryError: Java heap space
[Full GC 1194751K->1183306K(1365376K), 4.5841678 secs]
[Full GC 1194751K->1184329K(1365376K), 4.5469164 secs]
[Full GC 1194751K->1184831K(1365376K), 4.6415273 secs]
[Full GC 1194751K->1174738K(1365376K), 5.3647290 secs]
[Full GC 1194751K->1183878K(1365376K), 4.5660217 secs]
[Full GC 1194751K->1184651K(1365376K), 4.5619460 secs]
[Full GC 1194751K->1185795K(1365376K), 4.4341158 secs]

There's an Oracle support note with a very similar MO :
WebLogic Server: Getting "java.lang.OutOfMemoryError: GC overhead limit exceeded" exception with Sun JDK 1.6 [ID 1242994.1]
If I search for "java.lang.OutOfMemoryError: GC overhead" on Oracle Support it returns at least 12 documents
Might be bug 6065704. Search Oracle support for this bug number.
Best Regards
mseberg

Allocated heap memory goes up even when there is enough free memory

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Our Java application's memory usage keep growing. Further analysis of the heap memory using JProbe shows that the allocated heap memory goes up even when there is enough free memory available in the heap.
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Hi Eric,
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anush_tv wrote:
1) Can we run 32bit JVM on Windows 64? Even if we run, can i allocate more than 2 GB for heap memory?Yes, but you're limited to 2GB like any other 32-bit process.
2) I dont see the rational why we cannot run on 64bit JVM - because, JAVA programs are supposed to be 'platform-independent' and the application in form of byte code should be running no matter if it is a 32bit or 64-bit JVM?It's probably related to JBoss itself, which is likely using native code. I don't have experience with JBoss though.
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Hi Ramesh,
You would have posted this question in Netweaver Administrator forum...
Well here are the answers.
Login to Configtool.
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Hello all,
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JDK 1.6 update 37 64-bit
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2). Increase the Java heap size for WLS_FORMS
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John,
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As for 11.1.2.1, this can be installed fresh or as a patch over 11.1.2.0. So for machines that don't currently have anything installed, you can go directly to 11.1.2.1 without having to install 11.1.2.0 first.</blockquote>
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This is discussed in MOS note 989118.1</blockquote>
3). HA is important to us, so we are implementing a cluster of Forms/Reports servers with an LBR in front of it. I have read in the docs on clustering, cloning a managed server, and via Support, how to increase the heap memory for the WLS_FORMS server. My thought process was "if Oracle gives me instructions on how to increase heap memory and how to clone managed servers, there must be a scenario in which doing so provides benefit." I'm trying to understand the scenarios in which we would do either of those activities. <blockquote>Refer to the note I mentioned above. Generally, if you limit the number of concurrent sessions to less than around 300-400, I would think the default settings should be fine. If you think you would like to go beyond 300 or 400 per managed server then likely you will need to increase the max heap for the managed server. Again, refer to the note I mentioned previously.
Also see MOS note 1260074.1</blockquote>
I am aware of the JVM pooling (yes we do call out to Reports) - I've yet to implement this, but it's on my to-do list.
<blockquote>This is discussed in the [url http://docs.oracle.com/cd/E38115_01/doc.111210/e24477/jvm.htm]Forms Deployment Guide</blockquote>
Hope that helps ;)
.

Threaded inner classes & heap memory exhaustion

(_) how can i maximize my threading without running out of
heap memory?
push it to the limit, but throttle back before an
java.lang.OutOfMemoryError.
(_) within 1 threaded class ThreadClass, i have two threaded inner classes. for each instance of ThreadClass i only
start one instance of each inner class.
and, i start hundreds of ThreadClass, but not until the previously running ThreadClass object exits, so only one should be running at any given time.
so, what about threaded inner classes?
are they good? bad? cause "OutOfMemoryErrors"?
are those inner threads not dying?
what are common causes of:
java.lang.OutOfMemoryError: java heap space?
my program runs for about 5-minutes, then
bails with the memory error.
how can i drill down and see what
is eating-up all my memory?
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A Thread class is not the same as a thread of
execution. Those inner class based threads of
execution are not dying.maybe. but this is the way i test a thread's life:
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System.out.println("thread start");
System.out.println("thread dies and release memory");
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testing thread life reveals that they die.
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>
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note:
the outer thread is running on a remote host, and the inner threads
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public class BB implements Runnable, FinInterface {
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private void startResultsHandler(OisXoos oisX) {
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                while(moreData) {
                    .... // sql queries
                    oos.writeObject(data);
             StartResultsHandler(oisX);
        } // _____ class :: _ DataProxy _ :: class _____
}now, the BB class is not started locally.
the inner threads are started locally to both service data requests
by the BB thread as well as wait for its results.
(_) so, maybe the inner threads cannot exit (but they sure look
like they exit) until their parent BB thread exits.
(_) yet, those inner threads have no knowledge that the BB
thread is running.
externalizing those inner thread classes will put 2-weeks of work
in the dust bin. i want to keep them internal.
thanks.
here this piece of code that controls everything:
while(moreData) {
FinObjects finObj = new BB();
String symb = (String) data_ois.readObject();
OisXoos oisX = RSAdmin.getServer();
oisX.xoos.writeObject(finObj);
finObj.startDataProxy(finObj, oisX, symb);
}

How can i increase the maximum size of a text column in Access

hello,
i am inserting data in the MS-Access database through my servlet and am getting the exception whenever the length of the text data is more than 255 characters as in Access the maximum size for character data column is 255 can anyone tell me if there is any way by which i can increase the maximum limit of the column size in Access ,i.e. to make it more than 255.

A text field in Access has a maximum size of 255 characters. If you want to store text information in Access larger than 255, you need to use the memo rather than text data type. There are special considerations for using an Access memo data type and accessing it through JDBC. Specifically, I believe it must be accessed as a binary object (BLOB), rather than text when using the JDBC-ODBC bridge. There are lots of discussions within these forums regarding how to manage, and the issues with using the Access memo data type.
Good luck!

How can we increase the maximum number of records which we export from UME

Hi All,
Is there any way to increase the maximum number of records which we can export from the UME.
Please give your valuable suggestions as soon as possible.
Thanks in Advance
Regards,
Ramalakshmi.S

I didn’t find any configuration you can set to increase the number. I think it is related UI. The number is designed programmatically.
Lisa Zheng
TechNet Community Support

HT1338 Hi, Is there a way to increase the maximum size of a download? I'm trying to download Adobe premiere pro (1GB) and I'm getting an error message that says my maximum download is 10 MG

Hi, Is there a way to increase the maximum size of a download? I'm trying to download Adobe premiere pro (1GB) and I'm getting an error message that says my maximum download is 10 MG

That's between you and your internet service provider. By the way, you posted to the 10.3 forum. 10.3 can't run on your MacBook Pro. Don't forget the following facts:
b= bit
B = Byte
8 bits in a byte
A typical DSL connection has 1 Mbps speed or 128 kBps speed.
At that speed
1 minute gives you 7.5 MB
10 minutes gives you 75 MB
100 minutes gives you 750 MB
A typical cable connection can be 5 times faster although some are 30 times faster.
A typical fiber connection is 15 times faster and some are 50 times faster.
Ask what your speed is rated at.

Memory increase problem on Solaris

We need your help in understanding and solving a memory problem in one of our products running on Soalris. The server memory keeps growing and there is a fear of a server crash.
We've run our product with Purify and libumem to identify memory leaks. Both of these products didn't report any leak. So, we are very much confident that there are no memory leaks in the product. Still the memory increase is seen on Unix systems. We've done extensive analysis on this subject and absorbed some key points regarding memory management in Unix.
1) Memory doesn't shrink on Unix systems. This is for the libc to retain the released memory and reuse it for further memory requirements.
2) Based on the memory requirements to our application there can be a stabilization point where in the application can serve all memory requests.
After reaching this point the Server memory doesn't increase.But the fear is that it may exceed the hardware resources constraint.
3) Rapid increase in memory can be because of Memory Fragmentation problem. There are environmental variables like Small Block Allocator (_M_SBA_OPTS) and Arena (_M_ARENA_OPTS) on HP-Unix machines which can be used to address Fragmentation issues. We've performed some tests using these variables and found significant improvement in the usage of memory. This confirms that there are no memory leaks. These variables are specific to HP-Unix machines and we are unaware of similar variables/mechanism on Sun Solaris Platform. Please recommend some environmental variables/mechanism on Sun Solaris platform to solve fragmentation problem.
We are performing some tests to observe memory stabilization over a period of time .
The memory bloat is following a pattern. Memory is increasing in chunks of (MB) 2,4,8,16,32,64,128,256,512,1024 MB pattern.
For example if Memory increase is 64 MB, then it stabilizes for some time and the next increase would be 128 MB at a time.
Then it stabilizes for double the time consumed earlier for 64 MB and after that only increases by 256 MB.
So the memory increase and stabilization time are getting doubled each time. Please validate our analysis and kindly suggest what can be done on Unix platforms for solving this memory increase problem.

Thanks MaximKartashev for your inputs.
Ours is a Multithreading application. We are testing it with Hoard for the last three days. The observation so far has been that the performance of Hoard is high but the bloat pattern is not avoided.
Even with Hoard, memory bloat is following a pattern. Memory is increasing in chunks of (MB) 2,4,8,16,32,64,128,256,512,1024 MB pattern.
We are searching for other ways to control this pattern and stabilize the application by making it to reuse the fragmented memory completely.
We have also tried Solaris libgc memory allocator (http://developers.sun.com/solaris/articles/libgc.html). It worked well initially and memory drop was seen. But on heavy load, it crashed the application with 'Can't allocate header' error. So this can't be used for heavy load.
We are trying to use Boehm-Demers-Weiser Garbage Collector (http://www.hpl.hp.com/personal/Hans_Boehm/gc/). Do any one have idea, if it controls memory fragmentation ?

Heap Memory Increases to Maximum

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