VM Abort using concurrent GC

We have been experimenting with the concurrent GC options in 1.4.2. We enjoy very high throughput until the VM aborts in either 1.4.2-b28 and 1.4.2_04-b05. Any suggetions would be appreciated.
Thanks
Mike
These are the options we invoke:
java -server \
-Xloggc: -noclassgc \
-Xms1500m -Xmx1500m
-XX:CMSInitiatingOccupancyFraction=60 \
-XX:+UseConcMarkSweepGC \
-XX:+UseParNewGC \
-XX:NewSize=400m \
-XX:MaxNewSize=400m
The crash appears to occur during the remark phase:
15445.361: [ParNew 1082643K->678658K(1535616K), 0.0447870 secs]
15445.411: [GC 678740K(1535616K), 0.0040590 secs]
Unexpected Signal : 11 occurred at PC=0x40290D18
Function=(null)+0x40290D18
Library=/usr/j2sdk1.4.2_04/jre/lib/i386/server/libjvm.so
=============================================================
52506.880: [ParNew 1078264K->676847K(1535616K), 0.0605050 secs]
52507.089: [GC 676878K(1535616K), 0.0037910 secs]
52509.867: [GC
Unexpected Signal : 11 occurred at PC=0x404AE7E9
Function=(null)+0x404AE7E9
Library=/usr/j2sdk1.4.2/jre/lib/i386/server/libjvm.so
==============================================================
304513.751: [ParNew 1084489K->681556K(1535616K), 0.0507580 secs]
304513.813: [GC 681645K(1535616K), 0.0039850 secs]
Unexpected Signal : 11 occurred at PC=0x402910B1
Function=(null)+0x402910B1
Library=/usr/j2sdk1.4.2/jre/lib/i386/server/libjvm.so

I missed another crash that occured during a full GC.
48227.451: [ParNew 682032K->577818K(1535616K), 0.0290600 secs]
48227.481: [Full GC
Unexpected Signal : 11 occurred at PC=0x403D2BED
Function=(null)+0x403D2BED
Library=/usr/j2sdk1.4.2/jre/lib/i386/server/libjvm.so

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##########BEGIN PYTHON CODE##################
"""TestCases for multi-threaded access to a DB.
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    records = 100000
def test_suite():
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    #print "\nGARBAGE OBJECTS:"
    #for x in gc.garbage:
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##########END PYTHON CODE##################Using the linux command 'top' prior to and during the execution of
the python script above, I noticed that a considerable amount of memory
is used up and never reclaimed when it ends.If you delete the db_home,
however, the memory is reclaimed.
Am I conjuring up the bsddb concurrent db store incorrectly somehow?
I'm using python 2.5.1 and the builtin bsddb module.
Thanks,
Gerald
Message was edited by:
user590005
Message was edited by:
user590005

I think I am seeing what you are reporing, but I need to check further into
the reason for this.
Running your program and monitoring with Top/vmstat before/after the test, and
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BEFORE RUNNING PYTHON TEST:
++++++++++++++++++++++++++
top - 17:00:17 up 7:00, 6 users, load average: 0.07, 0.38, 0.45
Tasks: 111 total, 1 running, 109 sleeping, 0 stopped, 1 zombie
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Swap: 2040212k total, 168k used, 2040044k free, 935936k cached
[swhitman@swhitman-lnx python]$ vmstat
procs -----------memory---------- ---swap-- -----io---- system ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
1 0 160 247096 20860 833604 0 0 31 22 527 675 7 1 91 1
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++++++++++++++++++++++++++
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Cpu(s): 3.7% us, 0.5% sy, 0.0% ni, 95.8% id, 0.0% wa, 0.0% hi, 0.0% si
Mem: 1545196k total, 1508156k used, 37040k free, 20948k buffers
Swap: 2040212k total, 168k used, 2040044k free, 1035788k cached
[swhitman@swhitman-lnx python]$ vmstat
procs -----------memory---------- ---swap-- -----io---- system ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 160 143312 21120 935784 0 0 31 25 527 719 7 1 91 1
AFTER RUNNING PYTHON TEST & DB_HOME IS DELETED:
++++++++++++++++++++++++++++++++++++++++++++++
But I think DB_ENV->close
top - 17:02:48 up 7:02, 6 users, load average: 1.22, 1.17, 0.76
Tasks: 111 total, 1 running, 109 sleeping, 0 stopped, 1 zombie
Cpu(s): 8.8% us, 0.5% sy, 0.0% ni, 90.5% id, 0.0% wa, 0.2% hi, 0.0% si
Mem: 1545196k total, 1405236k used, 139960k free, 21044k buffers
Swap: 2040212k total, 168k used, 2040044k free, 934032k cached
[swhitman@swhitman-lnx python]$ vmstat
procs -----------memory---------- ---swap-- -----io---- system ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
1 0 160 246208 21132 833852 0 0 31 25 527 719 7 1 91 1
So the Top/vmstat Memory Usage Summary is:
before test after test after rm db_home/*
Top 1407100k 1508156k 1405236k
mem used
vmstat
free/cache 247096/833604 143312/935784 246208/833852

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Regards
Albin Abraham

Are you using the same browser for the two sessions? I have seen instances where the user opens, say, IE, connects to Disco, and runs a worksheet. They then open another IE window, start another session, and run a different worksheet. What I believe was happening (and I'm not sure because we told the users to stop doing this) was the second browser may have tried to "reuse" the java session started by the first browser. When you went back to the first browser, it no longer had a valid session because the second browser had taken it.
To have to independent sessions, I'll start one in IE, and another in Firefox, or Netscape. This keeps the sessions from getting mixed up.
Then again, I could be wrong...

VM Abort using concurrent GC

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