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  1. JDK
  2. JDK-8145564

8036003: startup regression on linux fastdebug builds

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Details

    • Bug
    • Resolution: Fixed
    • P3
    • 9
    • None
    • infrastructure
    • None
    • b103
    • generic
    • linux

    Description

      Quoting Dmitry Dmitriev:

      ---

      Today I noticed regression in java start-up time on my Linux-x64 system. Especially on fastdebug version. It seems that it happened after sync hs-rt repo with main.
      I compare two versions with following JPRT id: 2015-12-14-130534.david.8145301 (push before sync with main) and 2015-12-14-225311.jprovino.hsrt-sync (sync with main).

      Here a small results:
      1) Bundle from 2015-12-14-130534.david.8145301 job

      Running "time ./java -version" give following average time:
      java version "9-internal"
      Java(TM) SE Runtime Environment (fastdebug build 9-internal+0-2015-12-14-130534.david.8145301)
      Java HotSpot(TM) 64-Bit Server VM (fastdebug build 9-internal+0-2015-12-14-130534.david.8145301, mixed mode)

      real 0m0.248s
      user 0m0.180s
      sys 0m0.036s

      Running "time ./java" give following average time:
      ...<some output>...
      real 0m0.457s
      user 0m0.488s
      sys 0m0.104s

      2) Bundle from 2015-12-14-225311.jprovino.hsrt-sync job

      Running "time ./java -version" give following average time:
      java version "9-internal"
      Java(TM) SE Runtime Environment (fastdebug build 9-internal+0-2015-12-14-225311.jprovino.hsrt-sync)
      Java HotSpot(TM) 64-Bit Server VM (fastdebug build 9-internal+0-2015-12-14-225311.jprovino.hsrt-sync, mixed mode)

      real 0m0.734s
      user 0m0.732s
      sys 0m0.048s

      Running "time ./java" give following average time:
      real 0m1.572s
      user 0m1.980s
      sys 0m0.180s

      Small update: I checked Windows-x64 system and not found regression in start-up time on it.

      ---

      I reproduced and ruled out the JDK changes integrated, and with the added information about Windows not regressing JDK-8036003 stood out.

      Building with --with-native-debug-symbols=none and backing out the changes in JDK-8036003 both get rid of the regression.

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              erikj Erik Joelsson
              redestad Claes Redestad
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                Created:
                Updated:
                Resolved: