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  1. JDK
  2. JDK-8152261

Cannot run child processes on more than once CPU socket

    Details

    • CPU:
      x86
    • OS:
      windows_2012

      Description

      FULL PRODUCT VERSION :
      This happens on 8u71 or 8u72

      Problem was resolved by downgrading to 8U25

      ADDITIONAL OS VERSION INFORMATION :
      6.3 9600 Server 2012 R2

      EXTRA RELEVANT SYSTEM CONFIGURATION :
      This is a G9 with two sockets each of 18 cores - set up for Hyperthreading

      A DESCRIPTION OF THE PROBLEM :
      We have a Java process launching many executables.
      These "engines" happen to be written in C++ with one main working thread each. They are designed to perform CPU and data intensive workloads.

      The hava process that launches this process is simply a broker that hands off contol to other process running on the same or different boxes. The problem
      happens irrespective of this.


      On the latest Java it is only possible ot max out one physical processor.
      on 8u25 the workload is spread evenly across both CPUs allowing the box to
      be maxed out.

      Checked all the bios settings - NUMA etc - no difference.



      REGRESSION. Last worked in version 8u60

      ADDITIONAL REGRESSION INFORMATION:
      Actually 8U25. It may work in intermediate versions - I have not tested

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Use java to launch CPU intensive executables on a multi core box with more than one processor

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      . See if all child processes run on one side or not
      ACTUAL -
      Can ony max out one CPU on the box.

      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      No crash

      REPRODUCIBILITY :
      This bug can be reproduced always.

      CUSTOMER SUBMITTED WORKAROUND :
      Downgrate to 25 which is now quite an old version.



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            • Assignee:
              fmatte Fairoz Matte
              Reporter:
              webbuggrp Webbug Group
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              Dates

              • Created:
                Updated:
                Resolved: