Evaluating Algorithms for Shared File Pointer Operations in MPI I/O

  • Authors:
  • Ketan Kulkarni;Edgar Gabriel

  • Affiliations:
  • Parallel Software Technologies Laboratory, Department of Computer Science, University of Houston,;Parallel Software Technologies Laboratory, Department of Computer Science, University of Houston,

  • Venue:
  • ICCS '09 Proceedings of the 9th International Conference on Computational Science: Part I
  • Year:
  • 2009

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Abstract

MPI-I/O is a part of the MPI-2 specification defining file I/O operations for parallel MPI applications. Compared to regular POSIX style I/O functions, MPI I/O offers features like the distinction between individual file pointers on a per-process basis and a shared file pointer across a group of processes. The objective of this study is the evaluation of various algorithms of shared file pointer operations for MPI-I/O. We present three algorithms to provide shared file pointer operations on file systems that do not support file locking. The evaluation of the algorithms is carried out utilizing a parallel PVFS2 file system on an InfiniBand cluster and a local ext3 file system using a 8-core SMP.