From: "Lee, Bo-sung" Newsgroups: comp.parallel.mpi,comp.parallel.pvm Subject: Re: from PVM to MPI Date: Sat, 05 Dec 1998 00:51:18 +0900 Organization: Dept. of Aerospace Eng. Seoul National Univ. / ETRI Super Computer Center Sender: bslee6@210.113.160.180 Message-Id: <366804F6.84@pvmcube4.snu.ac.kr> References: Reply-To: bslee@pvmcube4.snu.ac.kr Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: d.pasechnik@twi.tudelft.nl Xref: ukc comp.parallel.mpi:4402 comp.parallel.pvm:7825 Dima Pasechnik wrote: > > Dear all, > > I wonder how straighforward it might be to port a > relatively simple PVM application to MPI. > I think you can convert from PVM apps. to MPI easily line by line except some commands. > The communication structure of the application is > rather simple master-slave. > All the slaves are started once, at the beginning of computation. Most MPI don't allow master-slave model. So, you need to convert master-slave apps to SPMD model. It's simple I think. > > One problem with PVM application lies with absense a > full PVM implementation on Unicos/mk (Cray T3E). In crayt3e, there are not ome PVM commands and different from standare pvm commands. I convert my master-slave pvm code to MPI code in CrayT3E like below. 1. Master-Slave mode PVM code -> SPMD model standard PVM code. 2. SPMD standard PVM code -> SPMD PVM code specific in CrayT3E 3. SPMD PVM code specific in CrayT3E -> MPI CODE line by line. > So I would have to do some porting, one way or another. > > I'd appreciate cc-ing replies to d.pasechnik@twi.tudelft.nl > > Thanks in advance. > Dmitrii In crayT3E, pvm and mpi is converted SHMEM library inside system. So, the performance of two message passing libraries are negligible. If you want to know how to convert standard PVM code to CrayT3E code, I send to my code. (This code is for CFD application) -- Lee, Bo-sung Ph.D Candidates in Aerospace Eng. Seoul National Univ. Invited Reseacher in ETRI/Supercomputing Center mailto:bslee@pvmcube4.snu.ac.kr mailto:bslee@bslee.ml.org http://www.bslee.home.ml.org