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  1. JDK
  2. JDK-8028541

Native Memory Tracking enhancement

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Details

    • Enhancement
    • Status: Closed
    • P4
    • Resolution: Duplicate
    • 7u40, 8, 9
    • 9
    • hotspot
    • generic
    • generic

    Description

      Current Native Memory Tracking implementation does not scale well with large app, especially during class loading phase. There are two major issues:

      1. Book keeping records consume a lot of memory, especially when large app loads a lot of classes that generate a lot of symbols (each symbol is individually malloc'd)

      2. Worker thread may not be able to handle the workload. When that happens, unprocessed book keeping records can consume a large amount of additional memory.

      Due to above problems, Native Memory Tracking system trends to shut itself down when it is needed the most.

      This RFE is intended to fix the scalability issues in original NMT implementation.

      Attachments

        Issue Links

          blocks

          Enhancement - null JDK-8042469 Launcher changes for native memory tracking scalability enhancement

          • P3 - Major loss of function.
          • Closed
          duplicates

          Bug - A problem which impairs or prevents the functions of the product. JDK-8027713 psr:perf native memory tracking takes 40% of runtime for fusion apps

          • P2 - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. JDK-8046288 NMT tests failed with RuntimeException: '...' missing from stdout/stderr

          • P3 - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. JDK-8044026 runtime/NMT/JcmdScale.java failed with: java.lang.RuntimeException: 'KB, committed=' missing from stdout/stderr

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

          Enhancement - null JDK-7022526 Add additional info about native memory usage in hs_err report

          • P3 - Major loss of function.
          • Closed

          Enhancement - null JDK-7177408 Dump native memory tracking data to hs_err file

          • P3 - Major loss of function.
          • Closed

          Enhancement - null JDK-8042633 Remove "AutoShutdownNMT" command line flag

          • P3 - Major loss of function.
          • Closed

          Sub-task - The sub-task of the issue JDK-8046598 Scalable Native Memory Tracking development

          • P2 - Crashes, loss of data, severe memory leak.
          • Resolved
          relates to

          Enhancement - null JDK-8042469 Launcher changes for native memory tracking scalability enhancement

          • P3 - Major loss of function.
          • Closed

          Enhancement - null JDK-8042633 Remove "AutoShutdownNMT" command line flag

          • P3 - Major loss of function.
          • Closed

          Enhancement - null JDK-8044140 [TESTBUG] Create NMT (Native Memory Tracking) tests for NMT2

          • P3 - Major loss of function.
          • Closed

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              zgu Zhengyu Gu
              zgu Zhengyu Gu
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              Dates

                Created:
                Updated:
                Resolved: