[Beowulf] hpl - large problems fail

Craig Tierney ctierney at hpti.com
Thu Mar 10 17:29:07 EST 2005


On Thu, 2005-03-10 at 13:00, Paul Johnson wrote:
> All:
> 
> I have a 4 node cluster(dont snicker :) ) and Im trying to do some 
> benchmarking with HPL.  I want to test 2 of the nodes with 1Gb of
> ram each.  I calculated the maximum problem size that can fit in 2Gb
> and still allow for memory for the operating system.  That came out to
> be around 14500x14500.  When I run that size of a test it always fails.
> The largest problem that I can test and not have it fail on me is 
> 12500x12500. 
> What is the reason behind this?  Im confused on what is going on here. 
> Thanks for any help.

Run hpl on each node by itself, using all of the memory.
You probably have a bad stick of memory somewhere.

Craig

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