On Jan 4, 2011, at 8:34 AM, Jeff Squyres wrote:
> 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.
DOH, sorry bad at math.
I will inform the user to check his datatype and count, thanks guys.
>> 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
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