From owner-nwchem-users@emsl.pnl.gov Wed Jun 15 02:04:11 2005 Received: from odyssey.emsl.pnl.gov (localhost [127.0.0.1]) by odyssey.emsl.pnl.gov (8.12.10/8.12.10) with ESMTP id j5F94B9v002828 for ; Wed, 15 Jun 2005 02:04:11 -0700 (PDT) Received: (from majordom@localhost) by odyssey.emsl.pnl.gov (8.12.10/8.12.10/Submit) id j5F94B4x002827 for nwchem-users-outgoing; Wed, 15 Jun 2005 02:04:11 -0700 (PDT) Date: Wed, 15 Jun 2005 10:43:30 +0200 (CEST) From: Giacomo Mulas Subject: Re: NWChem 4.7 on a Gentoo cluster with Mosix (parallel?) In-reply-to: To: Edelmiro Moman Cc: NWChem users mailing list , David Toomey Reply-to: Giacomo Mulas Message-id: MIME-version: 1.0 Content-type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-OAC-capitanata-MailScanner: Found to be clean X-MailScanner-From: gmulas@ca.astro.it References: Sender: owner-nwchem-users@emsl.pnl.gov Precedence: bulk On Tue, 14 Jun 2005, Edelmiro Moman wrote: > Today we run the precompiled NWChem 4.7 binaries on a Gentoo linux cluster > with Mosix. The program seems to run fine on a single CPU but if we try to > use Parallel it does not work. "does not work" is a bit unspecific. Do you mean that it fails to run altogether, or that it fails to migrate among the CPUs in the cluster, or what? > Does anyone have a clue what the problem > might be? Should Parallel work in such a system? yes. I don't know whether it can migrate across nodes, since if I remember correctly it uses shared memory and this prevents migration. By the way, do you use Mosix or openMosix? They share the same heritage, but they became quite different beasts... > Should we get the source code and recompile it? That's a good idea. Actually, I remember that there are patches available to make MPICH openMosix-aware, so that MPI message passing is done in ways which do not prevent migration. Therefore it might be a good idea to also compile MPICH with such patches. > Can it be a network (password/privileges) problem? with respect to using parallel? yes, it can. Usually you have to arrange for passwordless login, using ssh keys or rsh host authentication (insecure over an untrusted network) or whatever else you prefer to that effect. Bye Giacomo -- _________________________________________________________________ Giacomo Mulas _________________________________________________________________ OSSERVATORIO ASTRONOMICO DI CAGLIARI Str. 54, Loc. Poggio dei Pini * 09012 Capoterra (CA) Tel. (OAC): +39 070 71180 248 Fax : +39 070 71180 222 Tel. (UNICA): +39 070 675 4916 _________________________________________________________________ "When the storms are raging around you, stay right where you are" (Freddy Mercury) _________________________________________________________________