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DTSTART;TZID=America/Chicago:20181116T103000
DTEND;TZID=America/Chicago:20181116T105000
UID:submissions.supercomputing.org_SC18_sess146_ws_ftxs113@linklings.com
SUMMARY:Analyzing the Impact of System Reliability Events on Applications 
 in the Titan Supercomputer
DESCRIPTION:Rizwan A. Ashraf and Christian Engelmann (Oak Ridge National L
 aboratory)\n\nExtreme-scale computing systems employ Reliability, Availabi
 lity and Serviceability (RAS) mechanisms and infrastructure to log events 
 from multiple system components. In this paper, we analyze RAS logs in con
 junction with the application placement and scheduling database, in order 
 to understand the impact of common RAS events on application performance. 
 This study conducted on the records of about 2 million applications execut
 ed on Titan supercomputer provides important insights for system users, op
 erators and computer science researchers. We investigate the impact of RAS
  events on application performance and its variability by comparing cases 
 where events are recorded with corresponding cases where no events are rec
 orded. Such a statistical investigation is possible since we observed that
  system users tend to execute their applications multiple times. Our analy
 sis reveals that most RAS events do impact application performance, althou
 gh not always. We also find that different system components affect applic
 ation performance differently. In particular, our investigation includes t
 he following components: parallel file system, processor, memory, graphics
  processing units, system and user software issues. Our work establishes t
 he importance of providing feedback to system users for increasing operati
 onal efficiency of extreme-scale systems.\n\nTag: Resiliency, Scientific C
 omputing\n\nRegistration Category: Workshop Reg Pass\n\n
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