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23Oct Pooma Meeting Notes
From: |
Jeffrey Oldham |
Subject: |
23Oct Pooma Meeting Notes |
Date: |
Tue, 23 Oct 2001 10:19:45 -0700 |
Participants in this week's Pooma meeting:
Jim Crotinger, Scott Haney, Mark Mitchell, Jeffrey D. Oldham, Stephen Smith
LANL decision on Pooma released Thursday. Scott Haney is optimistic.
Proximation people will minimize Pooma work this week.
Measurements:
Scheduling takes much more time than expected, but the measurements
are too gross to determine the exact area of waste.
Pooma::blockAndEvaluate() is taking a lot of time.
Jeffrey also worries about excessive variability in execution times
but does not know whether this is Pooma or the underlying machine.
Scott suggested asking the Blanca people to run some tests on a
reserved section of Bluemountain.
Both Scott and Mark want Pooma classes to profile the code using
Tau. The classes should compile away when not used. Contact John
Hall (via Jean Marshall 505.665.4486) for the classes developed by
Blanca. See also the r1 profiling. The profiling should be
semantically based in fine enough granularity to differentiate
different portions of code while coarse enough to avoid profiling
skew.
(In subsequent conversation between Mark and Jeffrey, Mark explained
that 1) the profiling code can remain in Pooma at all times and 2)
the profiling code can be added to and maintained by hand. Jeffrey
did not realize either of these were permissible.)
Optimizations:
Ensure all fields are turned into arrays.
STEPHEN, will send email with details.
Clues:
o Compressed fields on the left-hand side already have this
implemented, but regular fields do not yet.
o Use a zero-based field view to turn into an array.
Deferred: Cache guard cell fills.
Clues:
o Look for fillGuard() or fillGuardCells().
o Store in multipatch engines.
o Need a mechanism to save and retrieve iterates.
Thanks,
Jeffrey D. Oldham
address@hidden
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