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2008
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Accurately measuring collective operations at massive scale

10 years 10 months ago
Accurately measuring collective operations at massive scale
Accurate, reproducible and comparable measurement of collective operations is a complicated task. Although Different measurement schemes are implemented in wellknown benchmarks, many of these schemes introduce different systematic errors in their measurements. We characterize these errors and select a window-based approach as the most accurate method. However, this approach complicates measurements significantly and introduces a clock synchronization as a new source of systematic errors. We analyze approaches to avoid or correct those errors and develop a scalable synchronization scheme to conduct benchmarks on massively parallel systems. Our results are compared to the window-based scheme implemented in the SKaMPI benchmarks and show a reduction of the synchronization overhead by a factor of 16 on 128 processes.
Torsten Hoefler, Timo Schneider, Andrew Lumsdaine
Added 31 May 2010
Updated 31 May 2010
Type Conference
Year 2008
Where IPPS
Authors Torsten Hoefler, Timo Schneider, Andrew Lumsdaine
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