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  1. JDK
  2. JDK-6417150

Performance regression in NCAR microbenchmark from Jre 1.5.0_06

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    Details

    • Subcomponent:
    • Introduced In Build:
      b80
    • Introduced In Version:
      6
    • Resolved In Build:
      b90
    • CPU:
      x86
    • OS:
      windows_2003, windows_xp

      Description

      FULL PRODUCT VERSION :
      Java HotSpot(TM) Server VM (build 1.6.0-beta2-b81, mixed mode)

      ADDITIONAL OS VERSION INFORMATION :
      CPU : Intel(R) Pentium(R) 4 CPU 2.80GHz Northwood 130nm
      cache : 512kB ECC Sync., ATC, 8-way set, 64 byte
      Memory : 2GB DDR-SDRAM (2700)
      Motherboard : Intel Corporation D865GBF
      OS: (Win32 x86) 5.01.2600 (Service Pack 2)

      A DESCRIPTION OF THE PROBLEM :
      Performance Regression from Jre 1.5.0_06 running code
      listed for Bug ID 4755752 "Slow and erratic behaviour of hotspot server VM".

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -

      PSUM: 3.276800000000021E9
       MFLOPS: 219.5793749667873
      PSUM: 3.276800000000021E9
       MFLOPS: 340.7872 <<<<<<<<<<<<<< OK
      ACTUAL -
      PSUM: 3.276800000000021E9
       MFLOPS: 161.15410184917212
      PSUM: 3.276800000000021E9
       MFLOPS: 257.65161711408 <<<<<<<<< slower



      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      See Shallow class for Bug ID 4755752
      ---------- END SOURCE ----------

      Release Regression From : 5.0u6
      The above release value was the last known release where this
      bug was known to work. Since then there has been a regression.

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              Assignee:
              rasbold Chuck Rasbold
              Reporter:
              rmandalasunw Ranjith Mandala (Inactive)
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