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Subject: Re: [OMPI users] [Fwd: mpi alltoall memory requirement]
From: Ashley Pittman (ashley_at_[hidden])
Date: 2009-04-22 09:13:11


On Wed, 2009-04-22 at 12:40 +0530, vkm wrote:

> The same amount of memory required for recvbuf. So at the least each
> node should have 36GB of memory.
>
> Am I calculating right ? Please correct.

Your calculation looks correct, the conclusion is slightly wrong
however. The Application buffers will consume 36Gb of memory, the rest
of the application, any comms buffers and the usual OS overhead will be
on top of this so putting only 36Gb of ram in your nodes will still
leave you short.

Ashley,