|
I asked the original question, and I have a follow up. Like it or not, multi-core CPUs have been thrust upon us by the manufacturers and many of us are more likely to have access to a shared memory, multi core/multi processor machine, than a properly built cluster with MPI in mind.
So, two questions in this direction:
1. How feasible would it be to implement OpenMP in PETSc so that multi core CPUs could be properly used?
2. Even if we are building a cluster, it looks like AMD/Intel are thrusting multi core up on is. To that end, what is the feasibility of merging MPI and OpenMP so that between nodes, we use MPI, but within each node, OpenMP is used to take advantage of the multiple cores. On Nov 18, 2007, at 3:53 PM, Aron Ahmadia wrote: Hi Ben,
You're asking a question that is very specific to the program you're running. I think the general consensus on this list has been that for the more common uses of PETSc, getting dual-cores will not speed up your performance as much as dual-processors. For OS X, dual-cores are pretty much the baseline now, so I wouldn't worry too much about it.
~A
Hi,
someone was talking abt core 2 duo performance on os x in some previous email. it seems that due to memory issues, it's not possible to get 2x the performance. there's also some mention of amd vs intel dual core.
for computation using PETSc, is there any reason to buy one instead of the other? Also, supposed I use winxp + mpich2 + PETSc on a dual core, what sort of performance increase can we expect as compared to PETSc + nompi on the same machine?
or is that too difficult an answer to give since there are too many factors?
thank you
regards
|