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From Bradley Wagner <bradley.wag...@hannonhill.com>
Subject Re: 100% usage and hanging on startup of Spring/Hibernate app in Tomcat 5.5 on Ubuntu 7
Date Thu, 10 Sep 2009 20:31:04 GMT
I've tried each of the aforementioned GC options individually with the
following other parameters:
JAVA_OPTS="<GC Param> -Xms368m -Xmx512m -XX:MaxPermSize=128m -XX:+PrintGC
-XX:+PrintGCDetails -Djava.awt.headless=true -Dfile.encoding=UTF-8"

The *only option* that did not cause the startup process to halt
indefinitely on startup was the Serial GC option. I tried this one on 4 or 5
successive attempts and the server started up in under 30s. The others
halted indefinitely (i.e. at least 5-10m before I finally killed the
process) during GC as an incomplete GC log statement was the last thing in
the catalina.out file.

- Does this indicate some kind of threading problem in this Java env?
- Does the option "DoEscapeAnalysis" still use a parallel gc?
- Is the experimental more similar to the parallel or the serial?

Thanks,
Bradley

On Thu, Sep 3, 2009 at 4:24 PM, Caldarale, Charles R <
Chuck.Caldarale@unisys.com> wrote:

> > From: Bradley Wagner [mailto:bradley.wagner@hannonhill.com]
> > Subject: Re: 100% usage and hanging on startup of Spring/Hibernate app
> > in Tomcat 5.5 on Ubuntu 7
> >
> > And again in a new place on subsequent attempt.
>
> There's nothing unusual that I can see in the traces, so it looks like you
> will have to try random GC settings until something works (as Mark suggested
> some time ago).  Try turning these tags on, one at a time:
>
> -XX:+UseParallelGC
> -XX:+UseParallelOldGC
> -XX:+UseSerialGC
> -XX:+DoEscapeAnalysis
> -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC
>
> The last one is somewhat experimental, as the parameter implies.
>
>  - Chuck
>
>
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