SMP performance on Scyld

Miguel Costa mcosta at
Mon Dec 3 04:34:38 PST 2001

Hello all,

Wonder if you can help me again.
I'm testing Scyld on a cluster of dual athlon workstations and when I 
spawn MPI processes on all nodes there's always one process per node 
that is a lot faster than the other, so that most of the time only one 
process is running (this doesn't happen on RedHat 7.2 + LAM).

it's funny because running a single process is faster that with Redhat.

Isn't beompi configured to use shared memory on smp's, could this be 
because of bad smp support on 2.2.x kernels, or what?

Using the mpirun flags -arch smp etc. doesn't change a thing.

I'm guessing this must be a common problem, with a simple solution...

Miguel Costa

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