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DTSTART:19700308T020000
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DTSTAMP:20210402T160556Z
LOCATION:Track 9
DTSTART;TZID=America/New_York:20201112T144000
DTEND;TZID=America/New_York:20201112T150500
UID:submissions.supercomputing.org_SC20_sess215_ws_canopie105@linklings.co
 m
SUMMARY:Containers for Massive Ensemble of I/O Bound Hierarchical Coupled 
 Simulations
DESCRIPTION:Workshop\n\nContainers for Massive Ensemble of I/O Bound Hiera
 rchical Coupled Simulations\n\nElwasif, Whitfield, Park, Cianciosa\n\nWe p
 resent our experience using containers to scale up a massive ensemble of c
 oupled I/O bound workloads on the NERSC Cori supercomputer. We describe th
 e design of a hierarchical simulation structure using the Integrated Plasm
 a Simulator (IPS) that enables the flexible execution of coupled simulatio
 ns at the system, node and core levels using the same coupling abstraction
  and API. The hierarchical design allows for the node-level execution to b
 e efficiently executed using containers while not impacting the structure 
 of the simulation at the system level. We demonstrate the viability of the
  approach by presenting experimental results from applications in coupled 
 fusion plasma simulations that illustrate the performance impact of using 
 containers to deploy the node-level workloads, in conjunction with the use
 r-mountable XFS file systems to ameliorate the load on the Lustre parallel
  file system. We also present results from production runs showing the abi
 lity of the ensemble simulations to scale to hundreds of Cori Haswell node
 s, with little or no overhead.\n\nRegistration Category: Workshop Reg Pass
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