IV29473: TEST FAILURES WITH LARGE OPENMP THREAD COUNTS.

November 2012 PTF for XL C for AIX, V12.1
November 2012 PTF for XL C/C++ for AIX, V12.1
November 2012 PTF for XL Fortran for AIX, V14.1
November 2012 PTF for XL Fortran Runtime for AIX, V14.1
March 2013 PTF for XL C for AIX, V12.1
March 2013 PTF for XL C/C++ for AIX, V12.1
March 2013 PTF for XL Fortran for AIX, V14.1
March 2013 PTF for XL Fortran Runtime for AIX, V14.1

APAR status

• Closed as program error.

Error description

• When running test cases in 32 bit mode that make use of large
  OpenMP thread counts, the resulting binary produces one of the
  following issues:
  
  * Illegal instructions
  * Segmentation violations
  * Internal errors reported by MPI
     (e.g. ERROR: 0032-117 User pack or receive buffer is too
  small  (22960) in MPI_Recv )
  * Internal errors reported by the application.
  

Local fix

• n/a
  

Problem summary

• Users Affected:
  Users who have test cases that make use of large OpenMP thread
  counts are potentially affected by this issue.
  
  Problem Description:
  The internal implementation of certain OpenMP tasks were missing
  a lock and was optimized incorrectly.
  

Problem conclusion

• The OpemMP has been fixed.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  LI77164

Fix information

• Fixed component name

  XL SMP AIX

• Fixed component ID

  5725C7401

Applicable component levels

• R310 PSY U856059

     UP C