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From Felipe Jaekel <fkjae...@gmail.com>
Subject Re: Recommended Java 8 settings
Date Thu, 25 Aug 2016 18:54:37 GMT
Thanks for the replies,

I made some sampling on VisualVM with
-XX:+UseG1GC -XX:+UseStringDeduplication and Java 8 default.

Results were pretty much the same, so I kept the Java 8 default.

2016-07-28 13:29 GMT-03:00 Howard W. Smith, Jr. <smithh032772@gmail.com>:

> My responses below/inline,
>
> On Thu, Jul 28, 2016 at 10:23 AM, Felipe Jaekel <fkjaekel@gmail.com>
> wrote:
>
> > I used to run TomEE 1.7.2 with java 7 and the following config:
> > -Xms1G
> > -Xmx3G (server has 4G)
> > -XX:MaxPermSize=1G
> > -XX:+UseTLAB
> > -XX:+UseConcMarkSweepGC
> > -XX:+CMSIncrementalMode
> > -XX:+CMSClassUnloadingEnabled
> >
>
> I used the options similar to these above for years. With these settings
> (and throughout the years), I have seen memory required-and-used between
> 500M and 4G, depending on certain database queries/operations executed
> during runtime.
>
>
> >
> > I upgraded to Java 8 to use TomEE 7.0.x, so I decided to try different
> > settings:
> > -Xmx3G (server has 4G)
> > -XX:+UseG1GC
> > -XX:+UseStringDeduplication
> >
>
> Recently, I changed to these options above after seeing others speak about
> this in ActiveMQ (or tomcat) user mail list, and I am impressed with what I
> see whenever I check memory at runtime via Java Visual VM (via JMX). Now,
> quite consistently, I see memory required-and-used <= 500M (sometimes 700M,
> but not really over 700M).
>

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