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DTSTART;TZID=America/Chicago:20181116T103000
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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:Paul H. Hargrove and Dan Bonachea (Lawrence Berkeley National 
 Laboratory)\n\nGASNet-EX is a portable, open-source, high-performance comm
 unication library designed to efficiently support the networking requireme
 nts of PGAS runtime systems and other alternative models in future exascal
 e machines. This paper reports on the improvements in performance observed
  on Cray XC-series systems due to enhancements made to the GASNet-EX softw
 are.  These enhancements, known as "specializations", primarily consist of
  replacing network-independent implementations of several recently added f
 eatures with implementations tailored to the Cray Aries network.  Performa
 nce gains from specialization include (1) Negotiated-Payload Active Messag
 es improve bandwidth of a ping-pong test by up to 14%, (2) Immediate Opera
 tions reduce running time of a synthetic benchmark by up to 93%, (3) non-b
 ulk RMA Put bandwidth is increased by up to 32%, (4) Remote Atomic perform
 ance 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 s
 ee 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.\n\nT
 ag: Parallel Programming Languages, Libraries, and Models, Productivity\n\
 nRegistration Category: Workshop Reg Pass\n\n
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