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Supporting efficient noncontiguous access in PVFS over Infiniband

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3 Author(s)
Wu, J. ; Dept. of Comput. & Inf. Sci., Ohio State Univ., Columbus, OH, USA ; Wyckoff, P. ; Dhabaleswar Panda

Noncontiguous I/O access is the main access pattern in many scientific applications. Noncontiguity exists both in access to files and in access to target memory regions on the client. This characteristic imposes a requirement of native noncontiguous I/O access support in cluster file systems for high performance. In this paper, we address noncontiguous data transmission between the client and the I/O server in cluster file systems over a high performance network. We propose a novel approach, RDMA Gather/Scatter, to transfer noncontiguous data for such I/O accesses. We also propose a new scheme, optimistic group registration, to reduce memory registration costs associated with this approach. We have designed and incorporated this approach in a version of PVFS over InfiniBand. Through a range of PVFS and MPI-IO micro-benchmarks, and the NAS BTIO benchmark, we demonstrate that our approach attains significant performance gains compared to other existing approaches.

Published in:

Cluster Computing, 2003. Proceedings. 2003 IEEE International Conference on

Date of Conference:

1-4 Dec. 2003

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