From: David Skinner (dskinner_at_nersc_dot_gov)
Date: 06/14/2004
Greetings SP Users, The yearly process to make NERSC allocations requests (ERCAP) begins June 30. As part of the process PIs must report performance data for codes that are already running on Seaborg. Performance metrics must be quoted for the entire application, not just computational kernels, and must have been measured on Seaborg. NERSC provides a negligible overhead, easy-to-use, utility for this purpose. This utility, called "poe+", can be simply incorporated into batch scripts without recompiling your code. NERSC urges all users to include poe+ in their batch scripts. Please see the following web page for information about poe+: http://www.nersc.gov/nusers/resources/software/ibm/hpmcount/poe+.php The optional poe+ "-mpi" flag provides a report detailing MPI performance. This option introduces an small overhead, which for most applications will be negligible. NERSC recommends making a few runs with the the "-mpi" option in order to profile the communication in a parallel code. If you have questions please contact us at consult_at_nersc_dot_gov. Regards, David Skinner