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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 45765] New: Heap size is growing
Date Mon, 08 Sep 2008 19:48:17 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=45765

           Summary: Heap size is growing
           Product: Tomcat 6
           Version: 6.0.16
          Platform: HP
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Catalina
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: barak@peer39.com


I'm running Tomcat 6.0.16 on CentoOS 5, linked with native library, with
-security flag. 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). Looks like a leak...


I will try to run without SecurityManager, and see whether this is impacting
the results. 

Barak.


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