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From: Tim Mattox (timattox_at_[hidden])
Date: 2007-03-13 14:07:01

Can you upgrade to a newer version of Open MPI? There have been several
bugfix releases of the 1.1 series, and we are on the verge of releasing v1.2.
So, please try either 1.1.4 (or 1.1.5rc1), and/or try v1.2rc3.

On 3/12/07, Michael Epitropakis <mikeagn_at_[hidden]> wrote:
> Dear ompi users,
> I am using OpenMPI in order to parallelize an evolutionary algorithm.
> During the execution of the algorithm I have to send many same messages to
> some nodes. So, in order to generate and use these messages i use MPI_Pack
> and MPI_Unpack Each message has the following structure:
> {int, int, int[size], double[size2], double}
> In the beginning of the Algorithm everything is going well... but suddenly
> something is going wrong and i get the following messages::
> [compute-0-1.local:32461] *** An error occurred in MPI_Unpack
> [compute-0-1.local:32461] *** on communicator MPI_COMM_WORLD
> [compute-0-1.local:32461] *** MPI_ERR_TRUNCATE: message truncated
> [compute-0-1.local:32461] *** MPI_ERRORS_ARE_FATAL (goodbye)
> With a lot of debugging I found out that the first two integers, let me
> call them x, y, were not the values that i was expecting (the values that
> i have packed!!!). They were very strange: either big positive integers or
> big negative integers. I checked the buffer that I am using for these
> messages and it is much bigger than the required message storage. I can;t
> think of something else that could probably caused that problem
> Can you please help me with this?? What could have probably caused this
> problem?
> I am using OpenMPI version: Open MPI: 1.1 Open MPI SVN revision: r10477
> Thank you in advance
> Michael.
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Tim Mattox -
 tmattox_at_[hidden] || timattox_at_[hidden]
    I'm a bright...