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DTSTAMP:20181221T160731Z
LOCATION:D168
DTSTART;TZID=America/Chicago:20181116T103000
DTEND;TZID=America/Chicago:20181116T104500
UID:submissions.supercomputing.org_SC18_sess144_ws_pawatm107@linklings.com
SUMMARY:GASNet-EX Performance Improvements Due to Specialization for the C
 ray Aries Network
DESCRIPTION:Workshop\nParallel Programming Languages, Libraries, and Model
 s, Productivity, Workshop Reg Pass\n\nGASNet-EX Performance Improvements D
 ue to Specialization for the Cray Aries Network\n\nHargrove, Bonachea\n\nG
 ASNet-EX is a portable, open-source, high-performance communication librar
 y designed to efficiently support the networking requirements of PGAS runt
 ime systems and other alternative models in future exascale machines. This
  paper reports on the improvements in performance observed on Cray XC-seri
 es systems due to enhancements made to the GASNet-EX software.  These enha
 ncements, known as "specializations", primarily consist of replacing netwo
 rk-independent implementations of several recently added features with imp
 lementations tailored to the Cray Aries network.  Performance gains from s
 pecialization include (1) Negotiated-Payload Active Messages improve bandw
 idth of a ping-pong test by up to 14%, (2) Immediate Operations reduce run
 ning time of a synthetic benchmark by up to 93%, (3) non-bulk RMA Put band
 width is increased by up to 32%, (4) Remote Atomic performance is 70% fast
 er 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 sp
 eedups for an intra-node benchmark and 26% for inter-node.  These improvem
 ents are available in the GASNet-EX 2018.3.0 release.
URL:https://sc18.supercomputing.org/presentation/?id=ws_pawatm107&sess=ses
 s144
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