From: Lars Rzymianowicz Newsgroups: comp.parallel.mpi Subject: Re: Using both share and distributed memory Date: Wed, 12 May 1999 08:45:26 +0200 Organization: Dept. of Computer Engineering, University of Mannheim, Germany Message-Id: <37392386.3EA70D5F@ti.uni-mannheim.de> References: <3738415E.FDD427E@numeca.be> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Xref: ukc comp.parallel.mpi:5078 Jim Tuccillo wrote: > You can use shared and distributed memory simultaneously in a slightly > different context. On SPs with SMP nodes, you can assign a single MPI > task to each node and also have pthreads within each MPI task to use the > multiple CPUs of each node. In other words, message passing is between > nodes only. Thats one way. But MPICH offers also multiprotocol communication. With the -comm=shared option compiled, intranode comm. is done via SM, internode comm. via the network. No need to recode your app and mix MPI with MT... Lars -- Homepage: http://mufasa.informatik.uni-mannheim.de/lsra/persons/lars/