[Beowulf] Re: Beowulf Digest, Vol 9, Issue 12

[Patrick Geoffray]

Håkon Bugge wrote:
> I know of systems on previous lists which are listed as Myrinet systems, 
> but are actually only running Gbe. This might stem from the fact that 
> some vendors would like to get as many system listed as possible. When 
> they have benchmarked and submitted an N-node cluster with Myrinet, it 
> is very tempting to submit another N-node cluster using the same node 
> hardware;-).

Can you see such systems on the last list ?

The Top500 team asked us before the official release to check the 
Myrinet entries and we can confirm that we shipped hardware for all of 
them.

We have found a few mistakes in the past (Ethernet cluster with the same 
Rmax than similar Myrinet cluster for example). Sometimes, results are 
abnormal (Myrinet clusters benchmarked with Ethernet or very bad 
efficiency because of bad HPL parameters), sometimes people are too busy 
to even run Linpack and their machines are not on the list, but vendors 
tricks are usually easy to spot.

Patrick
-- 

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