[gmx-developers] itanium2 assembly kernel probs

Höfling Martin martin.hoefling at gmx.de
Fri Apr 24 16:29:58 CEST 2009

Am 24.04.2009 um 14:52 schrieb Alexander Herz:

Hey Alex,

> I guess this has popped up before, but just in case.

Yes - I asked the same question a year ago or so :-)

> The LRZ HPC cluster is running gromacs 4 without the assembly kernels
> because they
> apparently crash (Intel Itanium2 Montecito Dual Core and Intel  
> Itanium2
> Madison 9M machines).
> Is there a way to fix this?

In principle yes...
... but from what I remember it's not worth to put much effort in  
there.  The fortran loops give roughly 80% performance of assembly  
loops on Itanium, which is quite OK, and as an architecture Itanium is  
more or less dead. There will be a new prototype system in Munich this  
summer and from what I remember the HLRB2 replacement should be there  
in 2011. If you aren't simulating a real big system - performance of  
the HLRB2 is not a big advantage anymore compared to the usual  
Infiniband equipment.


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