Newsgroups: comp.parallel.mpi
From: Stephen Barnard <steve@megafauna.com>
Reply-To: steve@megafauna.com
Subject: Re: Explain Error Message
Organization: InterNex Information Services 1-800-595-3333
Date: Mon, 18 Nov 1996 16:40:38 -0800
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Message-ID: <32910203.7410@megafauna.com>

Thanalapati Thyagaraj wrote:
> 
> Hi,
> 
> Could anyone please explain the following error message? Any possible
> solutions are also greatly appreciated!
> 
> > MPI_Isend: internal MPI error: GER overflow (rank 7, comm 0)
> 
> In addition, is there any source where I can check such error messages
> and corresponding descriptions?
> 
> Thanks for everything in advance...
> 
> --tk
> -----------------------------------------------------------------------
> T.K. Thyagaraj                    Tel : Off  - (613) 520-2600 X 8757
> Parallel and Distributed                Home - (613) 235-0297
> Systems Group (PARADISE)
> School of Computer Science        Fax : (613) 520-4334
> Carleton University
> Ottawa, ON K1S 5B6                thyag@scs.carleton.ca
> CANADA

I can't say for sure about that specific message, but I've encountered
"memory error" messages from Isend on the T3D and SP2 when lots of Isend
messages are outstanding.  Isend must do some buffering.  Either avoid
it (if possible) or code a "throttle" that delays Isends when lots of
messages (which you can count) have been posted.

I've also had a lot of problems with Irsend, and now I avoid it like the
plague. 

	Steve Barnard

