[Wikidata-bugs] [Maniphest] [Commented On] T175919: investigate GC times on wikidata query service

[Gehel]

Gehel added a comment.

New GC configuration deployed, all servers restarted. I'll wait a few hours and I'll have a look at GC logs to find out if we see improvements.

For reference, the JVM options before:

-XX:+UseG1GC
-Xms12g
-Xmx12g
-Xloggc:/var/log/wdqs/wdqs-blazegraph_jvm_gc.%p.log
-XX:+PrintGCDetails
-XX:+PrintGCDateStamps
-XX:+PrintGCTimeStamps
-XX:+PrintTenuringDistribution
-XX:+PrintGCCause
-XX:+PrintGCApplicationStoppedTime
-XX:+UseGCLogFileRotation
-XX:NumberOfGCLogFiles=10
-XX:GCLogFileSize=20M
-XX:+ExitOnOutOfMemoryError

and after the change:

-XX:+UseG1GC
-Xms12g
-Xmx12g
-Xloggc:/var/log/wdqs/wdqs-blazegraph_jvm_gc.%p.log
-XX:+PrintGCDetails
-XX:+PrintGCDateStamps
-XX:+PrintGCTimeStamps
-XX:+PrintAdaptiveSizePolicy
-XX:+PrintReferenceGC
-XX:+PrintGCCause
-XX:+PrintGCApplicationStoppedTime
-XX:+UseGCLogFileRotation
-XX:NumberOfGCLogFiles=10
-XX:GCLogFileSize=20M
-XX:+ParallelRefProcEnabled
-XX:+UnlockExperimentalVMOptions
-XX:G1MaxNewSizePercent=25
-XX:+ExitOnOutOfMemoryError

TASK DETAIL

https://phabricator.wikimedia.org/T175919

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To: Gehel
Cc: Stashbot, gerritbot, Smalyshev, Gehel, Aklapper, Gq86, Lordiis, Lucas_Werkmeister_WMDE, GoranSMilovanovic, Adik2382, Th3d3v1ls, Ramalepe, Liugev6, QZanden, EBjune, merbst, Avner, Lewizho99, Maathavan, debt, Jonas, FloNight, Xmlizer, Izno, jkroll, Wikidata-bugs, Jdouglas, aude, Tobias1984, Manybubbles, Mbch331

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