Newsgroups: comp.parallel.mpi
From: Luc.Vereecken@chem.kuleuven.ac.be (Vereecken Luc)
Subject: Re: MPI_Bcast
Organization: KULeuvenNet
Date: Fri, 21 Nov 1997 17:48:56 GMT
Message-ID: <880129754.218383@marvin.kulnet.kuleuven.ac.be>

kokliang@nsrc.nus.sg (Heng Kok Liang) wrote:

>Hi,

>  Can we use MPI_Bcast for MPMD program? I have two files called 'master.f'
>and 'slave.f', and I call MPI_Bcast(x, 1, MPI_INTEGER, 0, comm, ierr) in the
>file 'master.f', but I can't refer x in my 'slave.f', how can I solve this
>problem?

>  Thanks in advance.

>Best Regards,
>Heng Kok Liang

The broadcast on the master will send 'x' to your slave. The broadcast
on the slave will accept the value of 'x' and store it in a variable
somewhere, which could be y or z. The fact that you are broadcasting
'x' probably means the slave needs the value of 'x', so store it in
the corresponding variable. If the slave does not need 'x' (e.g. when
you are broadcasting between two master) you can either create a more
limited communicator, or create a dummy variable on the slaves that
temporarely receives the value of 'x', but disregards it afterwards.

Luc Vereecken