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From Mark Thomas <ma...@apache.org>
Subject Re: Tomcat 9 under Debian 10 - GC issues - 100% CPU
Date Wed, 15 Apr 2020 09:52:54 GMT
On 15/04/2020 10:39, Yves Berquin wrote:
> Hello,
> 
> Our typical platform for running our app is a dedicated server with 32GB of
> RAM running Tomcat 8.50 under Debian9 and Java 8. We run +- 20 .war
> programs on these platforms. It's running fine. The app is not very
> demanding - it gets its data from a postgresql server.
> 
> When we tried moving to the next versions: Debian10 , Tomcat 9 , Java 11 on
> the same machines we observe some 3+ seconds 100% CPU on all cores every
> other minute.
> It doesn't seem to be very dependent on the load.
> If we switch to a bigger server (128GB RAM) it's worse: > 7 seconds locks
> on all 32 CPU cores.
> 
> We tried all possible types of garbage collection, nothing makes a
> difference. Switching to the Java 8 GC (-XX:+UseParallelGC) - also no
> improvement.
> Reducing the RAM allocated to Tomcat with -Xms8g -Xmx8g doesn't make a
> difference.
> 
> Is there anywhere a set of typical settings for this particular environment?
> 
> Thanks for any help you can shine on this - feel free to contact me
> directly if you think you can help

I'd recommend getting a profiler (I use YourKit because they give free
licenses to OSS committers for OSS projects but other profilers are
available) and seeing what is generating that garbage. I don't think it
will be Tomcat related but if it is, we should be able to do something
about it.

Mark

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