Newsgroups: comp.parallel.mpi From: David Espadas Valladares Subject: Re: MPI_RECV Organization: Dpto. Arquitectura de Computadores. Universidad Complutense Date: Wed, 08 Jul 1998 11:46:05 +0200 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <35A33FDD.394F220B@eucmos.sim.ucm.es> As I have understood from the MPI standard definition, the MPI_Recv (I work in C, and I hope it doesn't make any important difference to this problem, although I can't be sure) is not strictly defined, so you don't know in advance if it buffers messages or not (although, as I said previously, every modern machine I know does it by means of a hardware buffer). In my opinion, and as you say, the best thing to try is to define a buffer and use buffered communications so avoiding the buffer problem. Knowing the size of message he is sending would help too, I think. -- _____________________________________________________________________________________ David Espadas Valladares Dpto. de Arquitectura de Computadores y Automatica Facultad de CC. Fisicas Phone: +34 91 394 43 64 Universidad Complutense Fax : +34 91 394 46 87 Ciudad Universitaria S/N E-mail: despadas@eucmos.sim.ucm.es 28040 Madrid - SPAIN d.espadas@computer.org _____________________________________________________________________________________