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  1. Harmony
  2. HARMONY-5920

[classlib][pack200][performance] ArrayList usage optimization

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 5.0M7
    • None
    • None
    • Latest pack200
    • Patch Available
    • Novice

    Description

      1. Microbenchmark on Sun 1.6.0_05 shows that iterating ArrayList via iterators is 3x slower than iterating via get(). This issue eliminates iterator() in favor of get().
      2. ArrayList-s are frequently instantiated with default capacity, even when the storage size is known. This issue sets the default capacities where applicable.

      Attachments

        1. pack200-arraylist-v3.patch
          40 kB
          Aleksey Shipilev

        Issue Links

          incorporates

          Improvement - An improvement or enhancement to an existing feature or task. HARMONY-5919 [classlib][pack200] getRelevantIcTuple minor change

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

          Activity

            People

              sjanuary Sian January
              aleksey.shipilev Aleksey Shipilev
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              Dates

                Created:
                Updated:
                Resolved: