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From Barak Yaish <ba...@peer39.com>
Subject Tomcat 6 Memory problem
Date Sun, 07 Sep 2008 10:46:27 GMT
Hello all,

 

I'm reposting here a question I posted before at the Users list, and someone
there suggested that maybe people who aware the source may be more useful.

 

So.

 

I'm running Tomcat 6.0.16 on CentoOS 5, linked with native library, 32 bit.
I deployed a Servelt, which on invocation executes an RMI call to a remote
RMI server. Tomcat configured with max heap size of 2G

 

After short time of running under heavy load, the memory consumption
reported by top is close to 2G. jmap output is:

 

 

 

Attaching to process ID 20248, please wait...

 

Debugger attached successfully.

 

Server compiler detected.

 

JVM version is 1.6.0-b105

 

 

 

using thread-local object allocation.

 

Parallel GC with 4 thread(s)

 

 

 

Heap Configuration:

 

   MinHeapFreeRatio = 40

 

   MaxHeapFreeRatio = 70

 

   MaxHeapSize      = 2147483648 (2048.0MB)

 

   NewSize          = 1048576 (1.0MB)

 

   MaxNewSize       = 4294901760 (4095.9375MB)

 

   OldSize          = 4194304 (4.0MB)

 

   NewRatio         = 2

 

   SurvivorRatio    = 8

 

   PermSize         = 16777216 (16.0MB)

 

   MaxPermSize      = 268435456 (256.0MB)

 

 

 

Heap Usage:

 

PS Young Generation

 

Eden Space:

 

   capacity = 582221824 (555.25MB)

 

   used     = 0 (0.0MB)

 

   free     = 582221824 (555.25MB)

 

   0.0% used

 

>From Space:

 

   capacity = 48103424 (45.875MB)

 

   used     = 48079216 (45.85191345214844MB)

 

   free     = 24208 (0.0230865478515625MB)

 

   99.9496751000511% used

 

To Space:

 

   capacity = 69402624 (66.1875MB)

 

   used     = 0 (0.0MB)

 

   free     = 69402624 (66.1875MB)

 

   0.0% used

 

PS Old Generation

 

   capacity = 1431699456 (1365.375MB)

 

   used     = 1424597528 (1358.6020736694336MB)

 

   free     = 7101928 (6.772926330566406MB)

 

   99.50395119798104% used

 

PS Perm Generation

 

   capacity = 35782656 (34.125MB)

 

   used     = 28493056 (27.173095703125MB)

 

   free     = 7289600 (6.951904296875MB)

 

   79.62811927655677% used

 

 

 

I've dump a file using jmap, and asked MemoryAnalyzer (www.eclipse.org/mat)
to take a look. This tool reported that an instance of java.security.Policy
retained 77.7% of the heap (552,569,816 bytes).

 

 

I would like to ask whether this behavior seems normal?

 

 

Thanks,

 

 

Barak.


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