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Subject: Re: [OMPI users] Sending large boradcasts
From: Brock Palen (brockp_at_[hidden])
Date: 2011-01-04 09:29:26


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.

Brock

>
>> 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
>>> www.umich.edu/~brockp
>>> Center for Advanced Computing
>>> brockp_at_[hidden]
>>> (734)936-1985
>>>
>>>
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>
> --
> Jeff Squyres
> jsquyres_at_[hidden]
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