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Subject: Re: [OMPI users] v1.3: mca_common_sm_mmap_init error
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2009-02-03 13:25:36


By peers I mean the number of MPI processes on the same host. So if
you run with 4 processes on a single host, OMPI sets up shared memory
for those 4 processes during MPI_INIT, regardless of whether you call
MPI send/receive functions or not.

On Feb 3, 2009, at 1:15 PM, Prentice Bisbal wrote:

> Jeff Squyres wrote:
>> On Feb 2, 2009, at 4:48 PM, Prentice Bisbal wrote:
>>
>>> No. I was running just a simple "Hello, world" program to test
>>> v1.3 when
>>> these errors occured. And as soon as I reverted to 1.2.8, the errors
>>> disappeared.
>>
>> FWIW, OMPI allocates shared memory based on the number of peers on
>> the
>> host. This allocation is during MPI_INIT, not during the first
>> MPI_SEND/MPI_RECV call. So even if you're running "hello world", you
>> could still be running out of shared memory space.
>
> Thanks for the info. Can you define peers for me?
>
> --
> Prentice
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-- 
Jeff Squyres
Cisco Systems