GASNet-EX Performance Improvements Due to Specialization for the Cray Aries Network

GASNet-EX is a portable, open-source, high-performance communication library designed to efficiently support the networking requirements of PGAS runtime systems and other alternative models on future exascale machines. This paper reports on the improvements in performance observed on Cray XC-series...

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Bibliographic Details
Published in2018 IEEE/ACM Parallel Applications Workshop, Alternatives To MPI (PAW-ATM) pp. 23 - 33
Main Authors Hargrove, Paul H., Bonachea, Dan
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.11.2018
Subjects
Active-Messages
Bandwidth
Benchmark testing
HPC
Lenses
Networking
Payloads
PGAS
Remote-Atomics
RMA
Runtime
Schedules
Software
Supercomputing
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Summary:GASNet-EX is a portable, open-source, high-performance communication library designed to efficiently support the networking requirements of PGAS runtime systems and other alternative models on future exascale machines. This paper reports on the improvements in performance observed on Cray XC-series systems due to enhancements made to the GASNet-EX software. These enhancements, known as "specializations", primarily consist of replacing network-independent implementations of several recently added features with implementations tailored to the Cray Aries network. Performance gains from specialization include (1) Negotiated-Payload Active Messages improve bandwidth of a ping-pong test by up to 14%, (2) Immediate Operations reduce running time of a synthetic benchmark by up to 93%, (3) non-bulk RMA Put bandwidth is increased by up to 32%, (4) Remote Atomic performance is 70% faster than the reference on a point-to-point test and allows a hot-spot test to scale robustly, and (5) non-contiguous RMA interfaces see up to 8.6x speedups for an intra-node benchmark and 26% for inter-node. These improvements are all available in GASNet-EX version 2018.3.0 and later.
DOI:10.1109/PAW-ATM.2018.00008