[
https://jira.terracotta.org/jira//browse/CDV-410?page=comments#action_22816 ]
Erh-Yuan Tsai commented on CDV-410:
-----------------------------------
Committed 5463 to enable using IBM jdk memory management.
A simple test program showed that ibm jdk using "Java heap" as name for old
generation, Sun uses "PS Old Gen".
Test code:
List<GarbageCollectorMXBean> gcmbeans =
ManagementFactory.getGarbageCollectorMXBeans();
for( GarbageCollectorMXBean gcmbean : gcmbeans )
{ System.out.println( "\nName: " + gcmbean.getName() );
System.out.println( "Collection count: " + gcmbean.getCollectionCount()
);
System.out.println( "Collection time: " + gcmbean.getCollectionTime() );
System.out.println( "Memory Pools: " );
String[] memoryPoolNames = gcmbean.getMemoryPoolNames();
for( int i=0; i<memoryPoolNames.length; i++ )
{ System.out.println( "\t" + memoryPoolNames[ i ] );
}
}
Sun:
-----
Name: PS Scavenge
Collection count: 21
Collection time: 5
Memory Pools: PS Eden Space
PS Survivor Space
Name: PS MarkSweep
Collection count: 0
Collection time: 0
Memory Pools: PS Eden Space
PS Survivor Space
PS Old Gen
PS Perm Gen
-----
IBM:
Name: J9 GC
Collection count: 2
Collection time: 7
Memory Pools: Java heap
------
1) IBM-jdk, for ManagementFactory.getGarbageCollectorMXBeans(), it returns only
one pool.
I guess, returns only one interested ( behaving different from Sun).
If test with ManagementFactory.getMemoryPoolMXBeans(); It lists all.
Name: class storage
Usage: init = 0(0K) used = 1625032(1586K) committed = 1968416(1922K) max =
-1(undefined)
Collection Usage: null
Peak Usage: init = 0(0K) used = 1625032(1586K) committed = 1968416(1922K) max =
-1(undefined)
Type: Non-heap memory
Memory Manager Names: J9 non-heap manager
Name: JIT code cache
Usage: init = 0(0K) used = 0(0K) committed = 524288(512K) max = -1(undefined)
Collection Usage: null
Peak Usage: init = 0(0K) used = 0(0K) committed = 0(0K) max = -1(undefined)
Type: Non-heap memory
Memory Manager Names: J9 non-heap manager
Name: JIT data cache
Usage: init = 0(0K) used = 24140(23K) committed = 524288(512K) max =
-1(undefined)
Collection Usage: null
Peak Usage: init = 0(0K) used = 24140(23K) committed = 524288(512K) max =
-1(undefined)
Type: Non-heap memory
Memory Manager Names: J9 non-heap manager
Name: miscellaneous non-heap storage
Usage: init = 0(0K) used = 326036(318K) committed = 458752(448K) max =
-1(undefined)
Collection Usage: null
Peak Usage: init = 0(0K) used = 346764(338K) committed = 458752(448K) max =
-1(undefined)
Type: Non-heap memory
Memory Manager Names: J9 non-heap manager
Name: Java heap
Usage: init = 67108864(65536K) used = 42254416(41264K) committed =
67108864(65536K) max = 67108864(65536K)
Collection Usage: init = 67108864(65536K) used = 470568(459K) committed =
67108864(65536K) max = 67108864(65536K)
Peak Usage: init = 67108864(65536K) used = 63753728(62259K) committed =
67108864(65536K) max = 67108864(65536K)
Type: Heap memory
Memory Manager Names: J9 GC
2) Tried different options, -server, -XX:+AggressiveOpts, -XX:+AggressiveOpts,
-XX:-UseParallelGC.
All returns "Java heap".
> Investigate how to improve the IBM JDK memory manager
> ------------------------------------------------------
>
> Key: CDV-410
> URL: https://jira.terracotta.org/jira//browse/CDV-410
> Project: Community Development
> Issue Type: New Feature
> Components: DSO:L1
> Affects Versions: 2.4-stable0, 2.4-stable1, 2.4.0, 2.4.1, 2.4.2
> Reporter: Geert Bevin
> Assigned To: Geert Bevin
>
> Verify if we can't use the IBM JDK platform management beans to create a
> version of the memory manager pool monitor for the IBM JDK. More info here:
> http://www-128.ibm.com/developerworks/java/library/j-mxbeans/
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
https://jira.terracotta.org/jira//secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira
_______________________________________________
tc-dev mailing list
[email protected]
http://lists.terracotta.org/mailman/listinfo/tc-dev
