This sounds like garbage collection by the JVM. I know there is a way to
control when the JVM garbage collects, but I amnot sure how. Anybody
else know how to do that?
Ben Ricker
Senior System Administrator
US-Rx, Inc.
On 15 Feb 2001 15:43:22 -0500, Kelly Kleinfelder wrote:
> We are running Tomcat 3.2.1 and Solaris 7 on a Sun e250 with 4 400Mhz processors.
>The problem we're having is that one thread is chewing up the majority of the cpu
>cycles and sometimes causes tomcat to hang.
>
> I have included sample mpstat data and the output from ps -L -p PID:
>
> ps -L -p 26361
> PID LWP TTY LTIME CMD
> 26361 1 ? 0:03 java
> 26361 22 ? 1:02 java
> 26361 23 ? 40:57 java
> 26361 24 ? 1:43 java
> 26361 26 ? 0:09 java
> 26361 67 ? 0:03 java
> (24 entries deleted for brevity. All were at 0:00 LTIME)
>
> mpstat 30
> CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl
> 0 12 0 12 6 4 17 0 1 0 0 75 0 3 1 96
> 1 6 0 6 4 1 14 3 0 0 0 52 59 1 1 39
> 2 0 0 0 64 62 12 2 0 0 0 20 41 1 1 57
> 3 4 0 14 203 3 27 0 1 0 0 26 0 0 0 100
> CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl
> 0 0 0 1 3 2 16 0 1 1 0 51 1 3 1 95
> 1 0 0 0 5 1 6 4 0 0 0 3 81 0 0 19
> 2 0 0 2 19 19 17 0 1 0 0 16 0 0 0 100
> 3 4 0 13 202 2 15 1 1 0 0 41 19 2 0 78
> CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl
> 0 4 0 5 5 5 17 0 1 1 0 70 1 2 1 96
> 1 4 0 0 5 1 11 4 0 0 0 36 84 0 0 15
> 2 2 0 4 26 26 28 0 1 0 0 81 2 0 0 98
> 3 0 0 20 204 4 19 1 0 0 0 24 14 0 0 86
>
> Before today, this was happening about every 3 days. Today it happened 5 hours
>apart. By going through our logs, we have determined that this is not caused by any
>specific user action. It is also not caused by server load, as it mostly happens with
>less than 5 users accessing the application. It is also not a gradual thing. Our sar
>statistics show that our processor idle time is 98% and then 5 minutes later it's
>down to 83% and in another 5 minutes, it's at 49%.
>
> Is there any way that I can tell exactly what is happening in the offending thread?
>
> Any other ideas on what's causing this problem?
>
> Thanks,
> Kelly
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