Newsgroups: comp.parallel.mpi
From: thakur@abacus.mcs.anl.gov (Rajeev Thakur)
Subject: Re: Q: MPI datatypes
Keywords: MPI datatype
Organization: MCS, Argonne National Laboratory
Date: Fri, 4 Apr 1997 18:59:24 GMT
Message-ID: <86018036413518@abacus.mcs.anl.gov>

In article <5i1j0f$b4e@flamingo.cs.ucla.edu>,
Andy Kahn <kahn@flamingo.cs.ucla.edu> wrote:
>
>Hi all,
>
>In MPI, if only one process creates a datatype using any of the
>MPI type constructors (ie: MPI_Type_contiguous), is that new
>datatype available to all other processes automatically?
>
>In a more general case, say I have four processes.  Each creates
>a different datatype.  Then are all four datatypes "known" to
>all four processes?
>
>Thanks,
>--Andy
>kahn@cs.ucla.edu
>

No, datatypes are purely local.