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JVM Mutex enter event

965834Oct 3 2012 — edited Oct 9 2012

Does anybody know more details about "JVM mutex enter" events recorded by jrockit flight_recorder?
We see peaks of these events during our load tests, the duration is sometimes up to 12 seconds. During the peak nearly all threads are waiting on this event. The CPU is nearly 100% but only 1-2 http requests are processed, no garbage collector is active.

Start Time Duration Thread Event Type
1.349. 12.344.185.000 [ACTIVE] ExecuteThread: '16' for queue: 'weblogic.kernel.Default (self-tuning)' JVM Mutex Enter
1.349. org.springframework.jms.listener.DefaultMessageListenerContainer#0-1 JVM Mutex Enter
1.349.100.265.821.415.000 [ACTIVE] ExecuteThread: '14' for queue: 'weblogic.kernel.Default (self-tuning)' JVM Mutex Enter

We are using this software on a VMware virtualized machine.

java version "1.6.0_29"
Java(TM) SE Runtime Environment (build 1.6.0_29-b11)
Oracle JRockit(R) (build R28.1.5-20-146757-1.6.0_29-20111004-1750-linux-x86_64, compiled mode)

Linux version 2.6.18-308.1.1.el5 ( (gcc version 4.1.2 20080704 (Red Hat 4.1.2-52)) #1 SMP Fri Feb 17 16:51:01 EST 2012

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Locked due to inactivity on Nov 6 2012
Added on Oct 3 2012
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