Run-to-Run Variability on Xeon Phi Based Cray XC Systems
SessionPerformance Analysis
Authors
Event Type
Paper
Performance
TimeThursday, November 16th11:30am -
12pm
Location402-403-404
DescriptionThe increasing complexity of HPC systems has introduced
new sources of variability, which can contribute to
significant differences in run-to-run performance of
applications. With components at various levels of the
system contributing variability, application developers
and system users are now faced with the difficult task
of running and tuning their applications in an
environment where run-to-run performance measurements
can vary by as much as a factor of two to three. In this
study, we classify, quantify, and present ways to
mitigate the sources of run-to-run variability on Cray
XC systems with Intel Xeon Phi processors and a
dragonfly interconnect. We further demonstrate that the
code-tuning performance observed in a
variability-mitigating environment correlates with the
performance observed in production running
conditions.
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