Data management and transfer in high-performance computational grid environments
Parallel Computing - Parallel data-intensive algorithms and applications
Adaptive MPI multirail tuning for non-uniform input/output access
EuroMPI'10 Proceedings of the 17th European MPI users' group meeting conference on Recent advances in the message passing interface
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We perform a set of communication experiments spanning multiple sites on the heterogeneous Grid'5000 infrastructure in France. The backbone widely employs high-band width optical fiber. Experiments with point-to-point MPI communications across sites show much lower band width than expected for the optical fiber connections. This work proposes and tests an alternative implementation of cross-site point-to-point communication, exploiting the observation that a higher band width can be reached when transferring TCP messages in parallel. It spawns additional MPI processes for point-to-point communication and significantly improves the band width for large messages. The approach comes closer to the maximum band width measured without using MPI.