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DTSTAMP:20181221T160727Z
LOCATION:D163
DTSTART;TZID=America/Chicago:20181112T103000
DTEND;TZID=America/Chicago:20181112T105500
UID:submissions.supercomputing.org_SC18_sess142_ws_pdsw103@linklings.com
SUMMARY:Integration of Burst Buffer in High-Level Parallel I/O Library for
  Exascale Computing Era
DESCRIPTION:Workshop\nI/O, Storage, Workshop Reg Pass\n\nIntegration of Bu
 rst Buffer in High-Level Parallel I/O Library for Exascale Computing Era\n
 \nHou, Al-Bahrani, Rangel, Agrawal, Latham...\n\nWhile the computing power
  of supercomputers continues to improve at an astonishing rate, companion 
 I/O systems are struggling to keep up in performance. To mitigate the perf
 ormance gap, several supercomputing systems have been configured to incorp
 orate burst buffers into their I/O stack; the exact role of which, however
 , still remains unclear. In this paper, we examine the features of burst b
 uffers and study their impact on application I/O performance. Our goal is 
 to demonstrate that burst buffers can be utilized by parallel I/O librarie
 s to significantly improve performance. To this end, we developed an I/O d
 river in PnetCDF that uses a log-based format to store individual I/O requ
 ests on the burst buffer – later to be flushed to the parallel file system
  as one request. We evaluated our implementation by running standard I/O b
 enchmarks on Cori, a Cray XC40 supercomputer at NERSC with a centralized b
 urst buffer system, and Theta, a Cray XC40 supercomputer at ALCF with loca
 lly available SSDs. Our results show that IO aggregation is a promising ro
 le for burst buffers in high-level I/O libraries.
URL:https://sc18.supercomputing.org/presentation/?id=ws_pdsw103&sess=sess1
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