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I am having a 4 nodes cluster of IBM Power5 with 4procs/node.When I
try to run HPL through LAM/MPI on this cluster,I notice that the
processes are sleeping for a very long time and the performance
achieved is very less.
I am not able to understand why this is happening whereas everything
is fine for ch_p4mpd device of mpich and I am getting good
performance.
::> If I give only one process per node means only 4 processes on the
cluster then also everything is fine and for 4 processes(only one
node occupied) on a single node everything is fine too.
::> My hostfile also has the lines like
cnode21 cpu=4
Please let me know the reason
Thanks in Advance
Dhruva
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