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  1. JDK
  2. JDK-8024838

Significant slowdown due to transparent huge pages

    Details

    • Subcomponent:
      gc
    • Introduced In Version:
      8
    • Resolved In Build:
      b54
    • Verification:
      Not verified

      Backports

        Description

        This bug is a follow-up to this thread:

        http://mail.openjdk.java.net/pipermail/hotspot-dev/2013-September/010803.html

        The changes for JDK-8007074 are causing a significant slowdown in the execution of jdk_core and jdk_svc tests on a machine running Ubuntu 12.0.4.1 LTS (64-bit) on Intel Xeon E5345 hardware. See attached image for the test execution times to see the significant jump from 45mins to >1h to run the tests at concurrency=4. The jump from under 45 minutes to 70+ minutes corresponds to when jdk8/tl was updated from jdk8-b104 to jdk8-b106 (since up to hs25-b48).

        From what I can tell, the changes in JDK-8007074 mean that large pages are being used when they weren't previously. Running with -XX:-UseLargePages restores the performance.

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                • Assignee:
                  stefank Stefan Karlsson
                  Reporter:
                  alanb Alan Bateman
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                  • Created:
                    Updated:
                    Resolved: