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  1. JDK
  2. JDK-8059241

C2: Excessive RemoveUseless passes during incremental inlining

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Details

    • Enhancement
    • Resolution: Fixed
    • P4
    • 13
    • 9, 10, 11, 12, 13
    • hotspot
    • b07

    Backports

      Description

        If you build the VM with JDK-8058968 included, and run the full suite of Nashorn/Octane with:

        ~/trunks/jdk9-dev/build/linux-x86_64-normal-server-release/images/j2sdk-image/bin/java -XX:+CITime -jar ~/trunks/jdk9-dev/build/linux-x86_64-normal-server-release/images/j2sdk-image/jre/lib/ext/nashorn.jar -Dnashorn.typeInfo.disabled=false --class-cache-size=0 --persistent-code-cache=false -scripting --log=time test/script/basic/run-octane.js -- --iterations 1

        Then you will see this output:
         http://cr.openjdk.java.net/~shade/8058968/new-output-2.txt

        Notice how much time Incremental Inlining consumes:

          Total compilation time : 480.712 s
            C2 Compile Time: 376.791 s
                 Incremental Inline: 84.199 s
                   IdealLoop: 1.061 s
                   IGVN: 10.713 s
                   Inline: 28.659 s
                   Prune Useless: 43.611 s
                   Other: 0.155 s

        This arguably has an effect on Nashorn warmup, and basically on how fast MH-heavy workloads ramp up.

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8078643 C2: Excessive RemoveUseless passes during incremental inlining

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

            Enhancement - null JDK-8059760 VM/JDK fixes for Nashorn performance (warmup/footprint, indy)

            • P3 - Major loss of function.
            • Open
            is blocked by

            Bug - A problem which impairs or prevents the functions of the product. JDK-8217782 Spill detection broken after JDK-8217716

            • P1 - Blocks development and/or testing work, production could not run.
            • Resolved
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-8221592 C2 compilation failed with assert(!q->is_MergeMem())

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8223581 C2 compilation failed with assert(!q->is_MergeMem())

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

            Enhancement - null JDK-8143321 Reduce the C2 compiler's memory usage

            • P3 - Major loss of function.
            • Closed

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                vlivanov Vladimir Ivanov
                shade Aleksey Shipilev
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                Dates

                  Created:
                  Updated:
                  Resolved: