You most likely have a deadlock problem ... Worker threads should
never hit 256. You should be able to stack dump your threads and see
that you're hanging on some locked resource -- objectstore, session,
something like that.
ms
On Oct 14, 2009, at 8:06 AM, Kristof Cossement wrote:
Hi all,
when deploying a webobjects app, we can see the min and max number
of WOWorkerThread specified by variables 'WOWorkerThreadCountMin'
and 'WOWorkerThreadCountMax'
root 43233 0.1 1,5 2612824 498428 ?? R Mi10am
160:15.03 /usr/bin/java -XX:NewSize=2m -Xmx64m -Xms32m -
DWORootDirectory=/System -DWOLocalRootDirectory= -DWOUserDirectory=/
System/Library/WebObjects/JavaApplications/wotaskd.woa -
DWOEnvClassPath= -DWOApplicationClass=Application -DWOPlatform=MacOS
-Dcom.webobjects.pid=43233 -Xms512m -Xmx2048m -DWOHost=192.168.11.8 -
DDatabasePoolSize=20 -classpath WOBootstrap.jar
com.webobjects._bootstrap.WOBootstrap -WOPort 12346 -
WOCachingEnabled YES -WODebuggingEnabled NO -WOOutputPath /Library/
WebObjects/Logs/AdvitServer-1 -WOAutoOpenInBrowser NO -
WOAutoOpenClientApplication NO -WOLifebeatInterval 30 -
WOLifebeatEnabled YES -WOLifebeatDestinationPort 1085 -WOAdaptor
WODefaultAdaptor -WOWorkerThreadCount 8 -WOListenQueueSize 128 -
WOWorkerThreadCountMin 16 -WOWorkerThreadCountMax 256 -
NSProjectSearchPath () -WOSessionTimeOut 3600 -WOApplicationName
AdvitServer -WOMonitorEnabled YES -WONoPause YES -
DWOHost=192.168.11.8 -DDatabasePoolSize=20
At some point, the number of threads in my application is 326, of
which 256 of them are WOWorkerThread's (dumped the threads with
jstack)
Even if load decreases, the 256 WOWorkerThread's do not disappear
anymore, it seems once created, they don't get released anymore.
Is there a mechanism in WebObjects that should release
WOWorkerThread's when not needed anymore ?
greetz
Kristof
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