JDK6 core observed

[Sharang Patil]

Hi,

 

I had a query regarding the GC tuning and JVM crashing and need your help in
understanding the scenarios better. Following are the details. Let me know
if you need any additional details.

 

java version "1.6.0_26"

Java(TM) SE Runtime Environment (build 1.6.0_26-b03)

Java HotSpot(TM) Server VM (build 20.1-b02, mixed mode)

 

Platform - SunOS 5.10 Generic_142909-17 sun4v sparc SUNW,Sun-Fire-T200

Primary Memory - 8GB

No of Processors - 32

 

Following are the JVM args we tried for the concurrent 350 users for 2 hours
Jmeter run and it worked fine.

 

For 350 threads

[-J-server -J-d64 -Xms6g -Xmx6g -Xss1m -J-noclassgc -J-verbose:gc
-XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+DisableExplicitGC
-XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:NewSize=1280m
-XX:MaxNewSize=1280m -XX:+CMSClassUnloadingEnabled
-XX:+PrintTenuringDistribution  -Xloggc:log/details.pipe -XX:+PrintHeapAtGC
-Dmail.smtp.auth=true -XX:TargetSurvivorRatio=60
-XX:CMSInitiatingOccupancyFraction=30 -XX:SurvivorRatio=8
-XX:MaxGCPauseMillis=5000 -XX:GCTimeRatio=19]

 

 

When we tried with 400 threads for 2 hours run, there is a core generated
with the JVM log file as 

# Problematic frame:

# V  [libjvm.so+0x84bc2c]  int
objArrayKlass::oop_oop_iterate_nv(oopDesc*,ParScanWithoutBarrierClosure*)+0x
1fc

 

I have attached the JVM log file and GC log file for this case.

 

 

Thanks,

Sharang



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