Long mixed pauses when using G1

Solution Unverified - Updated

Environment

  • JBoss Enterprise Application Platform (EAP)
  • Java 8
    • G1

Issue

  • We use G1 gc and sometimes see long mixed collection pauses (10+ seconds). How can we reduce these mixed pause times?

Resolution

  • Increase G1MixedGCCountTarget so that eligible old gen regions are collected across a larger amount of mixed collections, reducing individual mixed pauses.
-XX:G1MixedGCCountTarget=16
  • Reduce G1OldCSetRegionThresholdPercent so fewer regions are collected in a mixed collection:
-XX:G1OldCSetRegionThresholdPercent=5
  • Increase G1MixedGCLiveThresholdPercent to limit and focus collections to old regions containing less live objects:
-XX:+UnlockExperimentalVMOptions -XX:G1MixedGCLiveThresholdPercent=85
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