Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8204951

Investigate to use WorkGang for Parallel GC

    XMLWordPrintable

Details

    • Enhancement
    • Status: Resolved
    • P4
    • Resolution: Fixed
    • 11
    • 14
    • hotspot
    • gc

    Description

      All collectors but parallel gc use WorkGang to implement parallelism.

      This again and again causes us to add an additional abstraction layer above any code that tries to use parallel threads for all collectors (evacuation failure, dynamic thread sizing, reference processing, ...).

      Further the parallel gc task queue mechanism has disadvantages:
      - the work (tasks) must be known beforehand
      - getting work from the task queue incurs taking a global lock which is actually known for being inefficient in literature already

      Investigate to replace the parallel gc task queue mechanism with a work gang.

      proposed solution:
      JDK-8224659
      JDK-8224660
      JDK-8224661
      JDK-8224662
      JDK-8224663
      JDK-8224664
      JDK-8224665
      JDK-8224666

      Attachments

        Issue Links

          blocks

          Enhancement - null JDK-8210100 ParallelGC should use parallel WeakProcessor

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

          Enhancement - null JDK-8224660 Parallel GC: Use WorkGang (2: MarksFromRootsTask)

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

          Enhancement - null JDK-8224661 Parallel GC: Use WorkGang (3: UpdateDensePrefixAndCompactionTask)

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

          Enhancement - null JDK-8224662 Parallel GC: Use WorkGang (4: SharedRestorePreservedMarksTaskExecutor)

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

          Enhancement - null JDK-8224663 Parallel GC: Use WorkGang (5: ScavengeRootsTask)

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

          Enhancement - null JDK-8224664 Parallel GC: Use WorkGang (6: PSRefProcTaskProxy)

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

          Enhancement - null JDK-8224665 Parallel GC: Use WorkGang (7: remove task manager)

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

          Enhancement - null JDK-8224666 Parallel GC: Use WorkGang (8: obsolete and remove flags)

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

          Enhancement - null JDK-8231670 Remove TaskExecutor abstraction used in preserved marks processing

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

          Enhancement - null JDK-8231672 Simplify the reference processing parallelization framework

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

          Enhancement - null JDK-4996670 RFE: ParallelScavenge needs NoResourceMarkVerifier guards

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

          Enhancement - null JDK-8231669 Remove WorkerManager abstraction to support multiple work gang implementations

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8267214 assert(cm->region_stack()->is_empty()) failed: Region stack 0 is not empty

          • P3 - Major loss of function.
          • Closed

          Enhancement - null JDK-8204686 Dynamic parallel reference processing support for Parallel GC

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

          Enhancement - null JDK-8224659 Parallel GC: Use WorkGang (1: PCRefProcTask)

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

          Activity

            People

              lkorinth Leo Korinth
              tschatzl Thomas Schatzl
              Votes:
              0 Vote for this issue
              Watchers:
              2 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved: