[Beowulf] Slection from processor choices; Requesting Giudence

[Geoff Jacobs]

Mark Hahn wrote:
>> GigE is not perfect. My point is that for many applications
>> it can work well.
> 
> for many apps of certain job sizes...
> 
>> desktop (32 bit PCI) cards. I managed to get 14.6 HPL GFLOPS
>> and 4.35 GROMACS GFLOPS out of 8 nodes consisting of hardware
> ...
>> As a point of reference, a quad opteron 270 (2GHz) reported
>> 4.31 GROMACS GFLOPS.
> 
> that's perplexing to me, since the first cluster has semp/2500's,
> right?  that's a 1.75 GHz K8 core with 128K L2 and 64b memory
> interface.  versus the same number of 2.0 GHz, 1M cores each with
> 4x 128b memory.  I really wouldn't expect them to be that close - 
> any speculation on why GROMACS runs so poorly on the much better
> SMP machine?

<googling for motherboard specs>
Aha, Socket 462. The Semprons he used are K7 based.

-- 
Geoffrey D. Jacobs

Go to the Chinese Restaurant,
Order the Special