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

Technical Report · Tue Mar 27 04:00:00 EDT 2018

DOI:https://doi.org/10.2172/1430690· OSTI ID:1430690

Hargrove, Paul H. ^[1]; Bonachea, Dan ^[1]

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1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

This document is a deliverable for milestone STPM17-6 of the Exascale Computing Project, delivered by WBS 2.3.1.14. It 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 available in the GASNet-EX 2018.3.0 release.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21); USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC02-05CH11231; AC02-06CH11357
• OSTI ID: 1430690
• Country of Publication: United States
• Language: English

Related Subjects

97 MATHEMATICS AND COMPUTING