application threads were stopped for a long time
Hi, We have got the following problem.
application threads were stopped for a long time after Minor GC hava finished. Minor GC takes usally less than 1sec but a time application threads were stopped tekes often 100 sec.
What's jvm doing then? alternatively we want to get more information when Minor GC occured.
gc.log
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
33919.643: [GC 33919.643: [ParNew: 376030K->102916K(546176K), 0.1462336 secs] 1953320K->1680371K(4642176K), 0.1465861 secs]
Total time for which application threads were stopped: 0.1557298 seconds
Application time: 1.3021807 seconds
34020.827: [GC 34020.827: [ParNew: 376068K->103166K(546176K), 0.3350141 secs] 1953523K->1681429K(4642176K), 0.3353194 secs]
Total time for which application threads were stopped: 100.0714587 seconds
Application time: 1.0932169 seconds
34121.180: [GC 34121.180: [ParNew: 376318K->100333K(546176K), 0.3740967 secs] 1954581K->1680438K(4642176K), 0.3744228 secs]
Total time for which application threads were stopped: 99.2983213 seconds
Application time: 0.7258378 seconds
34122.304: [GC 34122.305: [ParNew: 373485K->115425K(546176K), 0.9584334 secs] 1953590K->1696193K(4642176K), 0.9587701 secs]
Total time for which application threads were stopped: 0.9823952 seconds
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machine spec and jvm option
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T2000 Solaris10 Sparc
1cpu 8core 32thread 1GHz, 8GB Memory
jvm 1.4.2_14
-d64 -server
-XX:NewSize=800m -XX:MaxNewSize=800m
-XX:SurvivorRatio=1
-XX:+DisableExplicitGC
-XX:+UseConcMarkSweepGC
-XX:+UseParNewGC
-XX:+CMSParallelRemarkEnabled
-XX:MaxPermSize=256m -XX:PermSize=256m
-XX:+UsePerfData
-verbose:gc
-XX:+PrintGCDetails -XX:+PrintGCTimeStamps
-XX:+PrintTenuringDistribution
-XX:+PrintGCApplicationStoppedTime
-XX:+PrintGCApplicationConcurrentTime
-Xloggc:/opt/local/jj/jboss/server/fujiyama/log/gc.log
-Xmx4800M -Xms4800M
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
we attempt single thread GC or set 2400M for heap memory
or -XX:UseParallelGC or set the following param
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-XX:NewSize=1000m -XX:MaxNewSize=1000m
-XX:SurvivorRatio=6
-XX:TargetSurvivorRatio=80
-XX:MaxTenuringThreshold=20
-Xmx4000M -Xms4000M
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
but the situation wasn't improved.
