Home	About	News & Publications	HPC Users	Projects
Systems	Services	Analytics	Status & Statistics	Help

HPC Users

Announcements

Subject:	[mpp-users] Franklin: Changes in OpenMP run time behavior.
Author:	Mike Stewart <pmstewart_at_lbl.gov>
Date:	2008-12-10 14:29:54
We have discovered that the upgraded version of the Cray Programming Environment that has been installed on Franklin requires some additional PBS and aprun parameters to run OpenMP jobs successfully. Now the "#PBS -l mppdepth=4" and "-d 4" argument to aprun are mandatory. The web documentation at https://www.nersc.gov/nusers/systems/franklin/programming/interlanguage.php#ftnmpiopenmp has been updated to reflect this, and you can see a sample script there. In addition, for OpenMP programs compiled with the pathscale compiler, there is a bug that requires the Pathscale PSC_OMP_AFFINITY environment variable tobe set to FALSE before the aprun command in order for the job to run successfully: bash: export PSC_OMP_AFFINITY=FALSE aprun .... csh: setenv PSC_OMP_AFFINITY FALSE aprun ... This bug has been reported to Cray. -- ===================================== Michael Stewart High Performance Computing Consultant NERSC User Services Group 510-486-6648 pmstewart@lbl.gov ===================================== _______________________________________________ mpp-users mailing list mpp-users@nersc.gov

	National Energy Research Scientific Computing Center
	A DOE Office of Science User Facility at Lawrence Berkeley National Laboratory	Site Map \| Help \| Search Login