[petsc-users] testing scalability for ksp/ex22.c (now ex45.c)

[Barry Smith]

On Feb 24, 2012, at 3:22 PM, Francis Poulin wrote:

> Thanks for the link.  I did the tests on an SGI SMP machine that, if I understand correctly, shares the memory much better than most other systems.  I will read about these different components and see what I can figure out.

   Yes, you could be right. Unlike traditional linux that machine is more likely to do the right thing by default.

   Barry

> 
> Thanks,
> Francis
> 
>> 
>>   You need to understand the issues of memory bandwidth shared between cores and between processors, memory affinity and thread affinity ("binding") see http://www.mcs.anl.gov/petsc/documentation/faq.html#computers
>> 
>>   Barry
>> 
>