[GitHub] [lucene-solr] uschindler commented on a change in pull request #644: SOLR-13394: Change default GC from CMS to G1

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[GitHub] [lucene-solr] uschindler commented on a change in pull request #644: SOLR-13394: Change default GC from CMS to G1

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uschindler commented on a change in pull request #644: SOLR-13394: Change default GC from CMS to G1
URL: https://github.com/apache/lucene-solr/pull/644#discussion_r276282835
 
 

 ##########
 File path: solr/bin/solr.cmd
 ##########
 @@ -1167,20 +1167,14 @@ set SOLR_OPTS=%SOLR_JAVA_STACK_SIZE% %SOLR_OPTS%
 IF "%SOLR_TIMEZONE%"=="" set SOLR_TIMEZONE=UTC
 
 IF "%GC_TUNE%"=="" (
-  set GC_TUNE=-XX:NewRatio=3 ^
-   -XX:SurvivorRatio=4 ^
-   -XX:TargetSurvivorRatio=90 ^
-   -XX:MaxTenuringThreshold=8 ^
-   -XX:+UseConcMarkSweepGC ^
-   -XX:ConcGCThreads=4 -XX:ParallelGCThreads=4 ^
-   -XX:+CMSScavengeBeforeRemark ^
-   -XX:PretenureSizeThreshold=64m ^
-   -XX:+UseCMSInitiatingOccupancyOnly ^
-   -XX:CMSInitiatingOccupancyFraction=50 ^
-   -XX:CMSMaxAbortablePrecleanTime=6000 ^
-   -XX:+CMSParallelRemarkEnabled ^
-   -XX:+ParallelRefProcEnabled ^
-   -XX:-OmitStackTraceInFastThrow
+  set GC_TUNE=-XX:+UseG1GC ^
+    -XX:+PerfDisableSharedMem ^
+    -XX:+ParallelRefProcEnabled ^
+    -XX:G1HeapRegionSize=16m ^
+    -XX:MaxGCPauseMillis=250 ^
+    -XX:InitiatingHeapOccupancyPercent=45 ^
+    -XX:+UseLargePages ^
+    -XX:+AggressiveOpts
 
 Review comment:
   Don't enable aggressive opts!

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