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LOCATION:507
DTSTART;TZID=America/Denver:20191117T144000
DTEND;TZID=America/Denver:20191117T150000
UID:submissions.supercomputing.org_SC19_sess108_ws_pawatm106@linklings.com
SUMMARY:Efficient Active Message RMA in GASNet Using a Target-Side Reassem
 bly Protocol
DESCRIPTION:Workshop\n\nEfficient Active Message RMA in GASNet Using a Tar
 get-Side Reassembly Protocol\n\nHargrove, Bonachea\n\nGASNet is a portable
 , open-source, high-performance communication library designed to efficien
 tly support the networking requirements of PGAS runtime systems and other 
 alternative models on future exascale machines. This paper investigates st
 rategies for efficient implementation of GASNet’s “AM Long” API that coupl
 es an RMA transfer with an Active Message (AM) delivery.\n\nWe discuss sev
 eral network-level protocols for AM Long and propose a new target-side rea
 ssembly protocol. We present a microbenchmark evaluation on the Cray XC Ar
 ies network hardware. The target-side reassembly protocol on this network 
 improves AM Long end-to-end latency by up to 33%, and the effective bandwi
 dth by up to 49%, while also enabling asynchronous source completion that 
 drastically reduces injection overheads.\n\nThe improved AM Long implement
 ation for Aries is available in GASNet-EX release v2019.9.0 and later.\n\n
 Tag: Workshop Reg Pass, MPI, Parallel Application Frameworks, Parallel Pro
 gramming Languages, Libraries, and Models, Scalable Computing\n\nRegistrat
 ion Category: Workshop Reg Pass, MPI, Parallel Application Frameworks, Par
 allel Programming Languages, Libraries, and Models, Scalable Computing
URL:https://sc19.supercomputing.org/presentation/?id=ws_pawatm106&sess=ses
 s108
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