multi core os x machines

Barry Smith bsmith at
Tue Nov 13 10:14:17 CST 2007

   Not possible. The problem is that with one process it uses all the  
bandwidth, when you change to use 2 processes (2 cores) each core
now gets only half the memory bandwidth and hence essentially half
the speed.



On Nov 13, 2007, at 10:06 AM, Gideon Simpson wrote:

> Has anyone had any success in getting good performance on multi-core  
> intel os x machines with petsc?  What's the right way to get MPICH  
> up and running for such a thing?
> -Gideon Simpson
>  Department of Applied Physics and Applied Mathematics
>  Columbia University

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