AFAIK they're the defaults that come from the installation: java -server -Xmx1944m -XX:+UseG1GC -XX:+PerfDisableSharedMem -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=250 -XX:+UseLargePages -XX:+AlwaysPreTouch -XX:+ExplicitGCInvokesConcurrent -Xlog:gc*:file=/srv/solr/logs/solr_gc.log:time,uptime:filecount=9,filesize=20M -Dsolr.jetty.inetaccess.includes= -Dsolr.jetty.inetaccess.excludes= -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.local.only=false -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.port=18983 -Dcom.sun.management.jmxremote.rmi.port=18983 -Dsolr.log.dir=/srv/solr/logs -Djetty.port=8983 -DSTOP.PORT=7983 -DSTOP.KEY=solrrocks -Duser.timezone=UTC -XX:-OmitStackTraceInFastThrow -Djetty.home=/usr/local/solr/server -Dsolr.solr.home=/srv/solr/data -Dsolr.data.home= -Dsolr.install.dir=/usr/local/solr -Dsolr.default.confdir=/usr/local/solr/server/solr/configsets/_default/conf -Dlog4j.configurationFile=/srv/solr/log4j2.xml -Dsolr.disable.shardsWhitelist=true -Xss256k -jar start.jar --module=http
On Thu, 2 Sept 2021 at 17:35, Walter Underwood <[email protected]> wrote: > What are your JVM settings (heap and GC)? > > wunder > Walter Underwood > [email protected] > http://observer.wunderwood.org/ (my blog) > > > On Sep 2, 2021, at 8:28 AM, Dominic Humphries <[email protected]> > wrote: > > > > We're trying to upgrade from 8.3.1 to 8.8.1 but my pre-release testing > has > > shown us some performance issues. Examination of the GC log shows that > the > > possible cause may be here: > > > > 8.3.1 graphs: https://imgur.com/a/ZM9wdob > > 8.8.1 graphs: https://imgur.com/a/UzMinwJ > > > > The test cycle here is 2 mins with requests; 2 mins no requests; 2 mins > > requests. You can see the 8.3 gives what I'd expect - fairly consistent > > heap usage, fairly fast & consistent GC durations. > > 8.8 however shows steadily increasing heap usage in the first request > cycle > > and a big spike in one of the GC durations. > > > > This broad pattern repeats - with sometimes more than one slow GC > operation > > for 8.8 - reliably each time I test. Is there any setting that might have > > been configured badly that could cause this? Or is it a bug? > > > > Thanks > > > > Dominic > >
