Re: multi core os x machines

[Barry Smith <bsmith@xxxxxxxxxxx>]

  Not possible. The problem is that with one process it uses all the  
memory
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.

   Barry


   Barry

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