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Subject: Re: [OMPI users] MPI_ERR_TRUNCATE
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2008-10-18 08:51:43


On Oct 17, 2008, at 6:03 PM, Nick Collier wrote:

> And under some conditions, I get the error:
>
> [3] [belafonte.home:04938] *** An error occurred in MPI_Wait
> [3] [belafonte.home:04938] *** on communicator MPI_COMM_WORLD
> [3] [belafonte.home:04938] *** MPI_ERR_TRUNCATE: message truncated
> [3] [belafonte.home:04938] *** MPI_ERRORS_ARE_FATAL (goodbye)
>
> When I do get the error, tracking the send and receive counts shows
> them as equal. And what I don't understand is that the
> receive_complete function in the above executes and the recv Struct
> actually contains the data that was sent. So, I'm confused about the
> error and what its trying to tell me as it looks like everything
> worked OK.

Perhaps it's a race condition? Remember that MPI_Wait triggers OMPI's
general progression engine -- so it may not be *this* receive that is
the problem; it could be some other pending receive that has a
mismatched send/receive length.

-- 
Jeff Squyres
Cisco Systems