[Beowulf] AMD Opteron Linpack Benchmark
ctierney at hypermall.net
Fri Sep 22 10:51:49 EDT 2006
Lai Dragonfly wrote:
> There is a rank 367 which achieve 79.97% efficiency.
> i'm using Infiniband to connect 2 nodes. each node has 8G memory and
> dual AMD opteron 250.
> i just tried Intel Compiler + GOTO, it just got a 60% efficiency which
> have a large difference with my target.
> maybe i need to try Pathscale or PGI compiler.
> any suggestion?
> thanks a lot.
It isn't the compiler. Use gcc and Goto and you will get the same
result. The biggest determiner of performance for HPL is the
configuration of HPL.dat. Also, run HPL on a single node to make
sure you are getting around 90% efficiency, then run across the IB
and see how things change.
> 2006/9/22, Craig Tierney <ctierney at hypermall.net
> <mailto:ctierney at hypermall.net>>:
> Lai Dragonfly wrote:
> > Dear all,
> > I'm doing the HPL benchmark on several nodes of AMD opteron
> platform but
> > may expand to hundred of nodes later.
> > i hope to get around 80% efficiency.
> What is your interconnect? 80% may be a bit high. You should look
> at the Top500 list to see what the efficiencies of other systems
> similar to yours.
> > Anyone has good suggestions of combination of compiler (appreciate if
> > includes compiler flags) + math lib on AMD platforms?
> > thanks a lot.
> Compiler and flags don't matter. HPL spends about 99.999% of its
> time in BLAS. Use GotoBLAS, it is very fast.
> What is most important is settings in the HPL.dat file. Use google to
> find some good settings or someone else can provide one. I don't have
> access to one right now.
> on the list may be able
> > PN
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