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  1. Hadoop Common
  2. HADOOP-10674

Rewrite the PureJavaCrc32 loop for performance improvement

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 2.5.0
    • performance, util
    • None
    • Reviewed

    Description

      Below are some performance improvement opportunities performance improvement in PureJavaCrc32.

      • eliminate "off += 8; len -= 8;"
      • replace T8_x_start with hard coded constants
      • eliminate c0 - c7 local variables

      In my machine, there are 30% to 50% improvement for most of the cases.

      Attachments

        1. c10674_20140609.patch
          36 kB
          Tsz-wo Sze
        2. c10674_20140609b.patch
          35 kB
          Tsz-wo Sze
        3. c10674_20140610.patch
          46 kB
          Tsz-wo Sze
        4. c10674_20140612.patch
          50 kB
          Tsz-wo Sze
        5. c10674_20140619.patch
          23 kB
          Tsz-wo Sze
        6. c10674_20140624.patch
          23 kB
          Tsz-wo Sze

        Issue Links

          relates to

          Improvement - An improvement or enhancement to an existing feature or task. HADOOP-15033 Use java.util.zip.CRC32C for Java 9 and above

          • Major - Major loss of function.
          • Resolved

          Activity

            People

              szetszwo Tsz-wo Sze
              szetszwo Tsz-wo Sze
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              Dates

                Created:
                Updated:
                Resolved: