Performance Variations using MPI/Myrico
lindahl at conservativecomputer.com
Thu Apr 26 23:47:38 EDT 2001
On Wed, Apr 25, 2001 at 10:26:27AM -0700, Thomas Davis wrote:
> We are looking for sites that run Intel Linux/SMP(dual)/MPI/Myricom 2k,
> and have experienced performance variations. IE, you've ran the NAS/FT
> parallel benchmark, densely packed (using all CPU's on the nodes), and
> noted that the runs come up different each time - and the difference is
> not minor (as much as 80%).
There are several sites with exactly that setup, such as the new Maui
machine, and the new NCSA machine.
I can say that with dual Alpha/MPI/Lanai 7 cards, performance
variations on a reasonable variety of benchmark codes (bonus points
for naming the bid this was for) were small, on order of 2%. I am
currently running dual Alphas with Myrinet2000 and haven't formally
measured variability, but it isn't large.
Come to think of it, I think HPTi's bid for the last NERSC cluster RFP
(which you have access to, yes?) has numbers for the NAS benchmarks on
dual Intel/MPI/Lanai 7 cards. These times were not highly variable and
we got the "right answer" compared to similar systems.
Beowulf mailing list, Beowulf at beowulf.org
To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
More information about the Beowulf