Hi,
The prefetching hardware is pretty good at hiding latencies, but
obviously you'll get better performance when everything fits in cache.
However, the largest data structures by far are the neighborlists,
and their _total_ size for the simulation is independent of whether
you are using multiple processes or multithreading.
Cheers,
Erik
On Apr 10, 2007, at 10:46 PM, vipin sachdeva wrote:
Thanks. Do you see L2 cache overflowing effects by putting multiple
MPI processes on the same chip with the recent multi-core processors
(Intel Woodcrest for instance)?
Regards
vipin
On Tue, 10 Apr 2007, Erik Lindahl wrote:
Hi,
On Apr 10, 2007, at 10:15 PM, vipin sachdeva wrote:
This thread on Feb 8 2006 mentions that threads are not yet
functional.
http://www.gromacs.org/pipermail/gmx-users/2006-February/019760.html
Is the threads still not functional considering I still get the
same error ?
We are only using threads for experimental development of the
nonbonded interaction loop. The multi-level-cache-locality
features on modern CPUs (even NUMA on Opterons) means that you
normally get better performance by partitioning the problem into
separate MPI processes, where each process resides on a separate
core.
Cheers,
Erik
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