JDK-6937160 : G1: should observe GCTimeRatio
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: hs18
  • Priority: P4
  • Status: Closed
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2010-03-22
  • Updated: 2013-09-18
  • Resolved: 2011-03-08
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JDK 6 JDK 7 Other
6u21Fixed 7Fixed hs17Fixed
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Description
Currently, G1 uses the G1GCPercent flag to determine what should be its target GC overhead. The flag is non-product. We recently made changes to the G1 flags to use existing ones where possible (see 6928059 for example).  So G1 should instead observe the existing GCTimeRatio flag instead of introducing a new one.

Comments
EVALUATION http://hg.openjdk.java.net/hsx/hsx17/master/rev/a71b16365b3b
09-04-2010

EVALUATION http://hg.openjdk.java.net/hsx/hsx17/baseline/rev/a71b16365b3b
08-04-2010

EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/56507bcd639e
03-04-2010

SUGGESTED FIX See Public Comments.
26-03-2010

EVALUATION See Public Comments.
26-03-2010

PUBLIC COMMENTS This is straightforward to implement. I will remove the G1GCPercent parameter and use GCTimeRatio to define the desired GC overhead for G1.
26-03-2010