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  1. JDK
  2. JDK-6488532

Support allocate prefetching of several sequential cache lines

    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 7
    • Fix Version/s: hs10
    • Component/s: hotspot
    • Labels:
      None
    • Subcomponent:
    • Resolved In Build:
      b03
    • CPU:
      x86
    • OS:
      solaris_10

      Backports

        Description

        I see about 3% improvement of jbb2005 score on Core2Duo with
        -XX:AllocatePrefetchLines=3 vs -XX:AllocatePrefetchLines=1 (default).

        The time spent in arraycopy dropped from 96 sec to 26 sec:

        -XX:AllocatePrefetchLines=1 :
        96.508 100.00 96.508 4.67 96.508 4.67 *arrayof_jshort_disjoint_arraycopy

        -XX:AllocatePrefetchLines=3 :
        25.868 100.00 25.868 1.25 25.868 1.25 *arrayof_jshort_disjoint_arraycopy

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                • Assignee:
                  kvn Vladimir Kozlov
                  Reporter:
                  kvn Vladimir Kozlov
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                  • Created:
                    Updated:
                    Resolved:
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