The home page of the Solr admin UI shows all of the options to the JVM. That will include the choice of garbage collector.
You can also see the options with “ps -ef | grep solr”. wunder Walter Underwood wun...@wunderwood.org http://observer.wunderwood.org/ (my blog) > On Oct 13, 2020, at 1:19 PM, Ryan W <rya...@gmail.com> wrote: > > I think I have it sorted. At this point I'm using GCG1, I take it, because > most recently I started Solr as a service... > > service solr start > > And that is running solr by way of /etc/init.d/solr because I don't have > any systemd unit for solr, as explained here... > https://askubuntu.com/questions/903354/difference-between-systemctl-and-service-commands > > And I can see in the System V script for solr that /etc/default/solr.in.sh > is the relevant config file. > > > On Tue, Oct 13, 2020 at 11:23 AM Ryan W <rya...@gmail.com> wrote: > >> Or, perhaps if I start solr like so.... >> >> service solr start >> >> ...it will use the solr.in.sh at /etc/default/solr.in.sh ? >> >> >> >> On Tue, Oct 13, 2020 at 11:19 AM Ryan W <rya...@gmail.com> wrote: >> >>> 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 >>>> >>>
