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DTSTAMP:20230124T171524Z
LOCATION:D221
DTSTART;TZID=America/Chicago:20221113T143500
DTEND;TZID=America/Chicago:20221113T150000
UID:submissions.supercomputing.org_SC22_sess435_ws_ross106@linklings.com
SUMMARY:Toward Efficient Oversubscription: On the Cost and Benefit of Even
 t-Based Communication in MPI
DESCRIPTION:Workshop\n\nToward Efficient Oversubscription: On the Cost and
  Benefit of Event-Based Communication in MPI\n\nBierbaum, Planeta, Härtig\
 n\nContemporary HPC systems run compute jobs on exclusively assigned hardw
 are resources. During communication, polling for progress is used for mini
 mal latency. Previous work on oversubscription and event-based communicati
 on shows these techniques can improve overall system utilization and reduc
 e energy consumption. Despite these findings, neither of the techniques is
  commonly used in HPC systems today. We believe that the current lack of d
 etailed studies of the low-level effects of event-based communication, a k
 ey enabler of efficient oversubscription, is a major obstacle to a wider a
 doption.\n\nWe demonstrate that the sched_yield system call, often used fo
 r oversubscription, is not best suited for this purpose on modern Linux sy
 stems. Furthermore, we incorporate event-based communication into Open MPI
  and evaluate the effects on latency and energy consumption using an MPI m
 icro-benchmark. Our results indicate that event-base communication incurs 
 significant latency overhead but also saves energy. Both effects grow with
  the imbalance of the application.\n\nSession Format: Recorded\n\nTag: Run
 time Systems, System Software\n\nRegistration Category: Workshop Reg Pass
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