mpich and cpi

andreas at andreas at
Thu Feb 28 04:04:50 EST 2002

I've just set up my first 8 node AMD cluster using Red Hat 7.2 and mpich. When I
run the sample program cpi the cluster scales fine up to a certain number of
intervals around 2.14*10e9, which takes rougly 8 secs for the entire cluster to
calculate. If I raise the number of intervals to 2.2*10e9 it suddenly takes
"forever" to calculate. I havent checked how long it would actually take but I
aborted it after 70 minutes. 
I've checked the memory (vmstat and top) for possible leaks or a lot of swapping
but that doesn't occur at all. What's going on?
Does anyone know of a good sample program to test scaling on (as cpi doesn't
involve much communication)?


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