[mpich-discuss] Mixing different CPU architectures

[Saurav Pathak]

Pavan,

Thank you for your reply.  By ISA, do you mean the bus architecture?  I 
am not sure what it means.  I shall be buying from the same vendor and 
the same model, but different CPU choices.

This link compares the two CPUs.
http://ark.intel.com/Compare.aspx?ids=47922,37103,

I am not sure what I should be looking at to see if they are compatible 
within MPICH2 restrictions.

Thanks,
Saurav



On 11/17/2010 11:57 AM, Pavan Balaji wrote:
>
> MPICH2 has a restriction on mixing different ISA's. Otherwise, 
> different processor speeds, etc., should not matter much (apart from 
> one of them being idle for longer during synchronization, as you 
> pointed out). Of course, this is not a tested configuration, though.
>
>  -- Pavan
>
> On 11/17/2010 10:49 AM, Saurav Pathak wrote:
>> Hi All,
>>
>> This is not specifically a MPICH question, but related.
>>
>> Is it OK to mix different CPU architectures in a set of nodes?  For
>> instance, I have dual quad code (Intel E5530, 2.4 MHz, 8MB L3) system.
>> Can I add a dual six core (Intel X5650, 2.66MHz, 12M L3) node to the mix
>> and still use MPICH?  Would I have to compile MPICH separately for
>> different architectures?  For tasks that are equally divided, the faster
>> system will obviously be idle for longer.
>>
>> I would like to hear your experience and comments.
>>
>> Thanks,
>> Saurav
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>