NDLI: Overlapping Methods of All-to-All Communication and FFT Algorithms for Torus-Connected Massively Parallel Supercomputers

Content Provider	IEEE Xplore Digital Library
Author	Jun Doi Negishi, Y.
Copyright Year	2010
Abstract	Torus networks are commonly used for massively parallel computers, its performance often becomes the constraint on total application performance. Especially in an asymmetric torus network, network traffic along the longest axis is the performance bottleneck for all-to-all communication, so that it is important to schedule the longest-axis traffic smoothly. In this paper, we propose a new algorithm based on an indirect method for pipelining the all-to-all procedures using shared memory parallel threads, which (1) isolates the longest-axis traffic from other traffic, (2) schedules it smoothly and (3) overlaps all of the other traffic and overhead for the all-to-all communication behind the longest-axis traffic. The proposed method achieves up to 95% of the theoretical peak. We integrated the overlapped all-to-all method with parallel FFT algorithms. And local FFT calculations are also overlapped behind the longest-axis traffic. The FFT performance achieves up to 90% of the theoretical peak for the parallel 1D FFT.
Starting Page	1
Ending Page	9
File Size	739682
Page Count	9
File Format	PDF
ISBN	9781424475575
e-ISBN	9781424475599
e-ISBN	9781424475582
DOI	10.1109/SC.2010.38
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-11-13
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Arrays Bandwidth Message systems Instruction sets Three dimensional displays Pipeline processing Equations
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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