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  1. JDK
  2. JDK-8293499

Provide jmod --compress option

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Details

    • Enhancement
    • Resolution: Fixed
    • P4
    • 20
    • 20
    • tools
    • b16

    Description

      I have been looking into `make clean-images images` performance, and realized jmod keeps compressing files with default compression level. Tuning that toward lighter compression levels improves build performance considerably, without a heavy loss in *.jmod sizes.

      Example after JDK-8293532:

      # ----- Baseline

      real 0m10.346s
      user 1m5.007s
      sys 0m10.424s

      81476 build/linux-x86_64-server-release/images/jdk/jmods/

      # ----- Patched, level 0 (good for interim JMODs)
      real 0m6.419s
      user 0m57.435s
      sys 0m10.991s

      184008 build/linux-x86_64-server-release/images/jdk/jmods/

      # ----- Patched, level 1 (good for final JMODs)
      real 0m9.237s
      user 1m0.818s
      sys 0m10.530s

      85760 build/linux-x86_64-server-release/images/jdk/jmods/

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              shade Aleksey Shipilev
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                Updated:
                Resolved: