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/?category=running#do-i-need-a-common-filesystemSay, we have a (diskless? equipped with very small disks?) cluster, on which only one node have access to a filesystem.
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?
Of course this would impacts the performance, because all data must be send over network, and the master may became a bottleneck. But is such scenario - IO of all processes bundled to one process - practicable at all?
Best wishes Paul -- Dipl.-Inform. Paul Kapinos - High Performance Computing, RWTH Aachen University, Center for Computing and Communication Seffenter Weg 23, D 52074 Aachen (Germany) Tel: +49 241/80-24915
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