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Subject: |
poe+ update |
Author: |
David Skinner <dskinner_at_nersc.gov> |
Date: |
2003-06-17 13:06:43 |
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@nersc.gov. This change in poe+ is effective Tue Jun 17 1:00 PM PST.
Regards,
David Skinner
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