From: David Skinner (dskinner_at_nersc.gov)
Date: 06/17/2003
Greetings NERSC User, A revision has been made to poe+ so that GFLOP/S numbers comply with the standard of using base 10 for FLOPs, 1 GFLOP = 1x10^9 FLOP The previous version had used a base 2 GFLOP definition similar to that used for memory, e.g., 1 Gbyte = 1024*1024*1024 Bytes GFLOP/S will now be reported using the base 10 definition while memory usage will still use the base 2 definition. For example a 32 task parallel program which executes 100000000 FLOPs per task in 3.64 seconds would have the following performance numbers: new version: ERCAP GFLOP/S : 0.871084 GFLOP/S ERCAP MEMORY : 0.042091 Gbytes for comparison the old version would have reported: old version: ERCAP GFLOP/S : 0.818745 GFLOP/S ERCAP MEMORY : 0.042091 Gbytes The definition of "ERCAP MEMORY" has not changed. If you have questions or feedback about poe+ or feel free to contact NERSC consultants at consult_at_nersc_dot_gov. This change in poe+ is effective Tue Jun 17 1:00 PM PST. Regards, David Skinner