[Beowulf] Performance characterising a HPC application

Kozin, I (Igor) i.kozin at dl.ac.uk
Fri Mar 23 08:15:58 PDT 2007

> real codes that computes a minimum. However, an alltoall on many 
> cores/nodes would exercise the same metric (many sends/recvs on the same 
> NIC at the same time), but would be harder to cheat and be much more 
> meaningful IMHO.

Could not agree more. We are certainly seeing that Alltoall 
is probably the third (after Stream Triad and PingPong) metric 
you want to know about your system in order to predict/assess real 
application performance.

> Patrick
> -- 
> Patrick Geoffray
> Myricom, Inc.
> http://www.myri.com

I. Kozin  (i.kozin at dl.ac.uk)
CCLRC Daresbury Laboratory, WA4 4AD, UK
skype: in_kozin
tel: +44 (0) 1925 603308

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