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  1. Proceedings of the second workshop on Scalable algorithms for large-scale systems (ScalA '11)
  2. On non-blocking collectives in 3D FFTs
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On non-blocking collectives in 3D FFTs

Content Provider ACM Digital Library
Author Saksena, Radhika S.
Abstract With the inclusion of non-blocking global collective operations in the MPI 3.0 draft specification many fundamental algorithms such as those for performing 3-dimensional (3D) FFTs will be modified to take advantage of non-blocking collectives. Novel modifications to such fundamental algorithms will need to be suitable for incorporation in general-purpose FFT libraries to be routinely used by HPC application users. Here we present such a general-purpose algorithmic strategy to utilize non-blocking collective communications in the calculation of a single parallel 3D FFT. In this scheme, the global collective communication is partitioned into blocking and non-blocking components such that overlap between communication and computation is obtained in the 3D FFT calculation. We present benchmarks of our scheme for overlapping computation and communication in the calculation of single variable 3D FFTs on two different architectures (a) HECToR, a Cray XE6 machine and (b) a Fujitsu PRIMERGY Intel Westmere cluster with InfiniBand interconnect.
Starting Page 15
Ending Page 18
Page Count 4
File Format PDF
ISBN 9781450311809
DOI 10.1145/2133173.2133180
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2011-11-14
Publisher Place New York
Access Restriction Subscribed
Subject Keyword Non-blocking collectives Mpi Parallel algorithms Fast fourier transforms
Content Type Text
Resource Type Article
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