can mpi_mandel show the performance of scyld beowulf?

Sean Dilda agrajag at scyld.com
Tue Aug 28 07:25:59 PDT 2001


On Tue, 28 Aug 2001, ×Þ ¹âÏÈ wrote:

>   from the web,i know mpi_mandel  can *TEST* cluster.also ,there are a 
> program LINPACK to benchmark the cluster..so i want to know that whether 
> the result the mpi_mandel got is suit to show the performance of 
> cluster?can it compare with LINPACK's result?

mpi-mandel and linpack use two different methods to calculate
performance.  mpi-mandel uses the intel performance counters, which
looks at exactly what the processor is doing for that job.
Unfortunately this only works for intell processors (ie it won't work
for athlons or crusoe's), and it is harder to get mpi-mandel to push
your processors as hard as they'll go.

linpack on the other hand, knows how much processing power it takes to
run the job, and gives you a number based on that.   As for your other
questions about the HPL.dat, linpack is a script that dynamically
creates an HPL.dat file for you.  You can look at the script to see what
it does, then create your own HPL.dat file (its really just a text file)
and call the xhpl binary by hand to use your own HPL.dat file.
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