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Subject: Re: [OMPI users] Sending large boradcasts
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2011-01-04 08:34:41

On Jan 3, 2011, at 5:14 PM, David Singleton wrote:

> That message should only be 2MB. Are you sure its not a mismatch of
> message lengths in MPI_Bcast calls?

+1 -- this is MB, not GB. The error message implies that one (or more?) MPI processes provided a size that was too small to receive. Or, more specifically, that not all MPI processes in the broadcast specified the same (count,datatype) tuple.

> David
> On 01/04/2011 03:47 AM, Brock Palen wrote:
>> I have a user who reports that sending a broadcast of
>> 540*1080 of reals (just over 2GB) fails with this:
>> *** An error occurred in MPI_Bcast
>> *** on communicator MPI_COMM_WORLD
>> *** MPI_ERR_TRUNCATE: message truncated
>> *** MPI_ERRORS_ARE_FATAL (your MPI job will now abort)
>> I was reading the archives and there appears to be an issue with large messages. I was a little confused, is there a way to send messages larger than 2GB?
>> The user has access to some IB machines, per a note in the archives there was an issue with writev() would this issue only be related to messages over ethernet?
>> Thanks just trying to get some clarification.
>> Brock Palen
>> Center for Advanced Computing
>> brockp_at_[hidden]
>> (734)936-1985
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Jeff Squyres
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