LI77164: TEST FAILURES WITH LARGE OPENMP THREAD COUNTS.

December 2012 Update for XL Fortran for Linux, V14.1
April 2013 Update for XL Fortran for Linux, V14.1
XL Fortran for Linux Fix Pack 4 (October 2013 Update) for 14.1
XL Fortran for Linux Fix Pack 5 (December 2013 Update) for 14.1
XL Fortran for Linux Fix Pack 6 (February 2014 Update) for 14.1
XL Fortran for Linux Fix Pack 7 (May 2014 Update) for 14.1

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:

  IV29473

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

Fix information

• Fixed component name

  XL FORTRAN LINU

• Fixed component ID

  5725C7500

Applicable component levels

• RE10 PSN IV29473

     UP06/09/13