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Lehrstuhl fr Informatik Zeit: Donnerstag, 14.04.2011, 16.30 Uhr

Summary: Lehrstuhl für Informatik
Zeit: Donnerstag, 14.04.2011, 16.30 Uhr
Ort: AH I, Ahornstr. 55
Referent: Dr. Torsten Höfler
Blue Waters Directorate, NCSA
Titel: Characterizing the Influence of System Noise on
Large-Scale Parallel Applications
System noise is increasingly a concern as HPC systems continue to grow in sca-
le. Good operating systems can minimize noise, however, some sources of
asynchronous slowdowns, such as recoverable hardware error remain. Existing
studies with artificial noise models provide only limited insight into application be-
havior under the influence of noise. This paper presents an in-depth analysis of
the impact of system noise on large-scale parallel application performance in rea-
listic settings. Our analytical model shows the particular circumstances under
which noise is propagated or absorbed. The model shows that not only collective
operations but also point-to-point communications influence the application's sen-
sitivity to noise. We present a simulation toolchain that injects noise delays from
traces gathered on four common large-scale architectures into a LogGPS simula-


Source: Ábrahám, Erika - Fachgruppe Informatik, Rheinisch Westfälische Technische Hochschule Aachen (RWTH)


Collections: Computer Technologies and Information Sciences