[Beowulf] profiling memory bandwidth of a job
M.Arndt at science-computing.de
Fri Jan 9 04:54:51 EST 2004
Problem: to get the characteristics of a commercial numerical
CFD code on a Cluster with respect to memory bandwidth.
The Application is running single cpu jobs on SMP Nodes, no
The runtimes show symptomes of concurring about memory bandwith.
I.e., if two One-CPU Jobs run on the dual CPU Node, the total run
time is far more than twice the time of one job + e.g 30 % penalty for
ressource competition of both jobs on a SMP Node.
Question: Is it possible, to show with standard linux profiling commands
that really memory bandwidth is the issue ?
(Memory requirements and disk IO rate of the jobs are moderate, as far
as iostat / top shows)
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