multi core os x machines

[Gideon Simpson]

This is also true for a multi-processor machine, or its unique to  
multi-core machines?
-gideon

On Nov 13, 2007, at 11:14 AM, Barry Smith wrote:

>
>   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
>>
>>
>

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