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Re^9: Limit on number of cores


there is new interesting problem: OS refuses to install the 32-bit version of MS MPI library! We could not force to do it. The system demands 64-bit version by all means.


On Thu Feb 16 '12 12:29pm, Alex Granovsky wrote
>Hi Vyacheslav,

>I searched through mpich-smp.dll and did not find any string
>resembling "PROCESSOR_COUNT". Most likely, you will not be able
>to use more than 32 cores with nt-mpich-smp. I'd suggest you to
>switch to MS MPI for this purpose. It is free and can be found here:


>Alex Granovsky
>On Thu Feb 16 '12 11:17am, Vyacheslav wrote
>>thanks very much!  I set variable value MPI_GLOBMEMSIZE=536870912  forever :-)
>>Now FF works up to 32 cores. I found the following text:

>>"By default, mpich limits the number of processes for the ch_shmem device to 32, unless it determines at configure time that the machine has more processors.
>>You can override this limit by setting the environment variable PROCESSOR_COUNT to the maximum number of processes that you will want to run, and then reconfigure and remake mpich."

>>Does it concern the given restriction? If yes, what to do? I am far from such things.


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