Hi Thanks for your response. However, I am running mpiexec .... -ppn 24 -n 192 /opt/IMB-MPI1 alltaoll -msglen /root/temp
And file /root/temp contains entry upto 65535 size only. That means alltoall test will run upto 65K size only
So, in that case I will require very less memory but then in that case also test is running out-of-memory. Please help someone to understand the scenario. Or do I need to switch to some algorithm or do I need to set some other environment variables ? or anything like that ?
On Apr 22, 2009 6:43pm, Ashley Pittman <ash...@pittman.co.uk> wrote:
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,
