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  1. JDK
  2. JDK-8005792

Long GC Pause Times When Opening Large Flight Recording in JMC

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Details

    • Enhancement
    • Resolution: Unresolved
    • P4
    • tbd
    • 7u40
    • hotspot
    • gc
    • Cause Known

    Description

      Opening a large (~150MB unzipped) flight recording in JMC causes inordinately long pause times when using the standard GC (Parallel Scavenge), with maximum pause times around 6-7 seconds during a 40 second timespan.

      In total this means that the time it takes to open that flight recording is around 40 seconds with parallel scavenge. Using CMS the equivalent time is around 14 seconds.

      Attachments

        1. webrev.zip
          457 kB
        2. jfr-profile.zip
          16.29 MB
        3. DenseParOld.java
          0.7 kB
        4. 1363360661906.log
          42 kB

        Issue Links

          relates to

          Enhancement - null JDK-8146987 Improve Parallel GC Full GC by caching results of live_words_in_range()

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-6949933 SerialGC outperforms ParallelGC on a server class machine for a Tomcat/Xythos/webdav application

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Activity

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              Unassigned Unassigned
              hdafgard Henrik Dafgård
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              Dates

                Created:
                Updated: