Re: [OMPI users] a question about [MPI]IO on systems without network filesystem

2010-10-19 Thread Richard Treumann
Subject: Re: [OMPI users] a question about [MPI]IO on systems without network filesystem Sent by: users-boun...@open-mpi.org On Thu, Sep 30, 2010 at 09:00:31AM -0400, Richard Treumann wrote: > It is possible for MPI-IO to be implemented in a way that lets a single > process or the set

Re: [OMPI users] a question about [MPI]IO on systems without network filesystem

2010-10-19 Thread Rob Latham
On Thu, Sep 30, 2010 at 09:00:31AM -0400, Richard Treumann wrote: > It is possible for MPI-IO to be implemented in a way that lets a single > process or the set of process on a node act as the disk i/O agents for the > entire job but someone else will need to tell you if OpenMPI can do this, > I

Re: [OMPI users] a question about [MPI]IO on systems without network filesystem

2010-09-30 Thread Richard Treumann
Open MPI Users List-Post: users@lists.open-mpi.org Date: 09/29/2010 09:50 PM Subject: Re: [OMPI users] a question about [MPI]IO on systemswithout network filesystem Sent by: users-boun...@open-mpi.org Hi Paul I think you should clarify whether you mean you want you application to send all

Re: [OMPI users] a question about [MPI]IO on systems without network filesystem

2010-09-29 Thread Terry Frankcombe
Hi Paul I think you should clarify whether you mean you want you application to send all it's data back to a particular rank, which then does all IO (in which case the answer is any MPI implementation can do this... it's a matter of how you code the app), or if you want the application to know not

Re: [OMPI users] a question about [MPI]IO on systems without network filesystem

2010-09-29 Thread jody
Hi Paul > Is it possible to configure/run OpenMPI in a such way, that only _one_ > process (e.g. master) performs real disk I/O, and other processes sends the > data to the master which works as an agent? It is possible to run OpenMPI this way, but it is not a matter of configuration, but of impl

[OMPI users] a question about [MPI]IO on systems without network filesystem

2010-09-29 Thread Paul Kapinos
Dear OpenMPI developer, We have a question about the possibility to use MPI IO (and possible regular I/O) on clusters which does *not* have a common filesystem (network filesystem) on all nodes. A common filesystem is mainly NOT a hard precondition to use OpenMPI: http://www.open-mpi.org/faq/