From: Pascal Proulx Newsgroups: comp.parallel.mpi Subject: Communicators and groups Date: Wed, 14 Apr 1999 15:19:24 -0400 Organization: Computing Devices Canada Message-Id: <3714EA3C.3A0D986C@cdott.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="------------CDEDC3E6CCD8D804F722F1B4" Xref: ukc comp.parallel.mpi:4920 This is a multi-part message in MIME format. --------------CDEDC3E6CCD8D804F722F1B4 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Hi, I need to create some communicators. I've found most of the documentation for that. But there is still one thing that is not obvious. Nowhere in the doc I have found if we can free the MPI_Group after the communicator has been created. Ex. int newRanks[2]; MPI_Group worldGroup, newGroup; MPI_Comm newComm; //Allocation of group, then communicator MPI_Comm_group(MPI_COMM_WORLD, &worldGroup); newRanks[0] = 1; newRanks[1] = = 2; MPI_Group_incl(worldGroup, newSize, newRanks, &newGroup); MPIComm_create(MPI_COMM_WORLD, newGroup, &newComm); //Done with the group: we created the communicator MPI_Group_free(&newGroup); //Could I do that before MPI_Comm_free? MPI_Group_free(&worldGroup);//Could I do that before MPI_Comm_free? //Do some stuff //... //Deallocation of communicator if (newComm != MPI_COMM_NULL) MPI_Comm_free(&newComm); If I can free the group before the communicators, that means that I can use local-scope variables for the MPI_Group variables. Thx, Pascal ======================================== Pascal Proulx Software Engineer, Maritime Systems Computing Devices Canada A General Dynamic Company Voice:(613) 596-7354 3785 Richmond Rd Fax: (613) 596-7125 MS-3165 Nepean, Ontario Canada, K2H 5B7 pascal.proulx@cdott.com ======================================== --------------CDEDC3E6CCD8D804F722F1B4 Content-Type: text/x-vcard; charset=us-ascii; name="vcard.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for Pascal Proulx Content-Disposition: attachment; filename="vcard.vcf" begin: vcard fn: Pascal Proulx n: Proulx;Pascal org: Computing Devices Canada, a General Dynamic Company email;internet: pascal.proulx@cdott.com title: Software Engineer x-mozilla-cpt: ;0 x-mozilla-html: FALSE version: 2.1 end: vcard --------------CDEDC3E6CCD8D804F722F1B4--