[MITgcm-support] AMD quad core
dtpolzin at wisc.edu
Tue Jan 6 14:15:54 EST 2009
I see now if you go back far enough you can get a lot of responses
about this topic...
On Mon 14 Apr 2008, Michael A. Spall wrote:
> I have been told that the MITgcm does not scale well with
> multicore processors. I am thinking about say 16 processors on
> 2 or 4 nodes (2 processors per node, dual or quad processors) with
> infiniband. Does anyone have experience with this?
So far in our testing at least dual core scales OKish - ie. on both
AMD systems we're scaling great with 2 cores out of 4 running user
see less than 3 speedup going to all 4 cores. I have not tried to test
running on 3 out of 4 cores on a node yet but I doubt it would be
worth it because the problem is with insufficient memory bandwidth
streaming at the socket level for AMD architectures and at the FSB
level for the Intel architectures.
Given that, quad cores are unlikely to be worth it for Intel systems.
Barcelona might be a somewhat better option according to published
performance numbers but I have not run on it yet - Chris has. However
expect to see more than a speedup of 3 within each quad core
processor or 6
in a dual socket node.
On the other hand you'll soon probably be out of options as all
going to be quad core or more and dual core "HPC" systems may not
because of lack of volume.
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