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  1. JDK
  2. JDK-6865703

G1: parallelize cache clean up

    Details

    • Subcomponent:
      gc
    • Resolved In Build:
      b08
    • CPU:
      generic
    • OS:
      generic
    • Verification:
      Not verified

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        Description

        When running performance tests with large heaps (24G or so) I noticed that GC worker 0 was taking longer in the RS updating phase than the rest. Here's an example:

              [Update RS (ms): 4.6 2.3 2.4 2.6 2.3 2.4 2.5 2.7 2.2 2.6 2.6 2.4 2.3
               Avg: 2.6, Min: 2.2, Max: 4.6]

        When the pause times were short, this resulted in long termination times for all but worker 0:

              [Termination (ms): 0.0 2.0 1.9 1.9 2.0 1.9 1.9 1.9 1.9 1.9 2.0 1.9 1.9
               Avg: 1.8, Min: 0.0, Max: 2.0]

        which added unnecessary time to the collection pause.

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                • Assignee:
                  johnc John Cuthbertson
                  Reporter:
                  tonyp Tony Printezis
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