System.gc() still resulting in garbage collections with -XX:+DisableExplicitGC

[James Nichols]

Hello,

I'm running with the following JVM arguments:

 -server -Xms4096m -Xmx4096m -XX:NewSize=1228M -XX:MaxNewSize=1228M
-XX:MaxTenuringThreshold=4 -XX:SurvivorRatio=6 -XX:+ScavengeBeforeFullGC
-XX:PermSize=256M -XX:MaxPermSize=256M -XX:-UseConcMarkSweepGC
-XX:+UseParNewGC -XX:ParallelGCThreads=3 -XX:+CMSParallelRemarkEnabled
-XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled -verbosegc
-XX:+DisableExplicitGC -XX:+PrintTenuringDistribution -XX:+PrintGCDetails
-XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC
-XX:+PrintGCApplicationConcurrentTime -XX:+PrintGCApplicationStoppedTime
-XX:+PrintClassHistogram -Xloggc:/var/log/jboss/gc.dat
-Dsun.net.client.defaultConnectTimeout=10000

Using Jstat, I see a bunch of System.gc() calls showing up:

Timestamp         S0     S1     E      O      P     YGC     YGCT    FGC
FGCT     GCT    LGCC                 GCC
       189869.1   0.00   0.00   1.80  21.36  89.74   3109   15.401  3012
288.886  304.288 System.gc()          No GC


Any ideas as to why I'm still getting these even though I have
-XX:+DisableExplicitGC set?

Jim
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