This is how I start solr:
/opt/solr/bin/solr start
In my /etc/default/solr.in.sh, I have this...
GC_TUNE=" \
-XX:+UseG1GC \
-XX:+ParallelRefProcEnabled \
-XX:G1HeapRegionSize=8m \
-XX:MaxGCPauseMillis=200 \
-XX:+UseLargePages \
-XX:+AggressiveOpts \
"
But I don't know how to tell if Solr is using that file.
In my /opt/solr/bin there is no solr.in.sh, but there is a solr.in.sh.orig
-- perhaps I should copy my /etc/default/solr.in.sh to /opt/solr/bin ?
I am running Linux (RHEL). The Solr version is 7.7.2. Solr 8.x is not
compatible with my application.
Thank you.
On Mon, Oct 12, 2020 at 9:46 PM Shawn Heisey <elyog...@elyograg.org> wrote:
> On 10/12/2020 5:11 PM, Ryan W wrote:
> > Thanks. How do I activate the G1GC collector? Do I do this by editing a
> > config file, or by adding a parameter when I start solr?
> >
> > Oracle's docs are pointing me to a file that supposedly is at
> > instance-dir/OUD/config/java.properties, but I don't have that path. I
> am
> > not sure what is meant by instance-dir here, but perhaps it means my JRE
> > install, which is at
> > /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64/jre -- but
> > there is no "OUD" directory in this location.
>
> The collector is chosen by the startup options given to Java, in this
> case by the start script for Solr. I've never heard of it being set by
> a config in the JRE.
>
> In Solr 7, the start script defaults to the CMS collector. We have
> updated that to G1 in the latest Solr 8.x versions, because CMS has been
> deprecated by Oracle.
>
> Adding the following lines to the correct solr.in.sh would change the
> garbage collector to G1. I got this from the "bin/solr" script in Solr
> 8.5.1:
>
> GC_TUNE=('-XX:+UseG1GC' \
> '-XX:+PerfDisableSharedMem' \
> '-XX:+ParallelRefProcEnabled' \
> '-XX:MaxGCPauseMillis=250' \
> '-XX:+UseLargePages' \
> '-XX:+AlwaysPreTouch')
>
> If you used the service installer script to install Solr, then the
> correct file to add this to is usually /etc/default/solr.in.sh ... but
> if you did the install manually, it may be in the same bin directory
> that contains the solr script itself. Your initial message says the
> solr home is /opt/solr/server/solr so I am assuming it's not running on
> Windows.
>
> Thanks,
> Shawn
>
