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  1. JDK
  2. JDK-8058564

Tiered compilation performance drop in PIT

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        In latest PIT of hs25.40 several jtreg tests failed due to exceeded timeout.
        Performed analysis showed that execution time of following tests increased significantly comparing to jdk8u40-b04:

        compiler/5091921/Test6905845.java
        compiler/5091921/Test6992759.java
        compiler/5091921/Test7020614.java
        compiler/7088419/CRCTest.java
        java/util/regex/RegExTest.java

        For example, java/util/regex/RegExTest.java take ~ 2minutes to finish with jdk8u40-b04 and ~ 15 minutes with PIT build.

        Issue could be reproduced with Xcomp and +TieredCompilation. It seems like only compilation on tier 3 is affected: with -TieredCompilation and -XX:TieredStopAtLevel=2 execution time is the same as with 8u40-b04.



          1. 8u40_b04.er.zip
            1.65 MB
          2. 8u40_pit.er.zip
            3.35 MB

              iveresov Igor Veresov
              fzhinkin Filipp Zhinkin
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                Created:
                Updated:
                Resolved: