From: Joachim Worringen <joachim@lfbs.rwth-aachen.de>
Newsgroups: comp.parallel.mpi
Subject: Re: MPI_Barrier - how about argument checking ?
Date: Tue, 15 Sep 1998 09:37:33 +0200
Organization: Chair for Operating Systems, RWTH Aachen
Message-Id: <35FE193D.44BD5EAF@lfbs.rwth-aachen.de>
References: <35FD350E.41C6@malaga.math.uni-augsburg.de>
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Peter Schaefer wrote:
> 
> How about checking that the argument comm to MPI_Barrier(comm)
> is a legal communicator ?
> 
> I have rewritten my communication routines about 9! times
> before I realized that MPI_Barrier wasn't taking the number
> of processes as an argument. Wrong numbers cause MPI to
> happily play core wars with your segment, till it nukes
> vital data.

It seems to me that you are using Communicators and Barriers in a wrong
way. You need to show your code and name the MPI implementation you are
using.

  Joachim

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