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SUMMARY:A role of spectral turbulence simulations in developing HPC system
 s - Yokokawa\, M (RIKEN)
DTSTART:20080926T142000Z
DTEND:20080926T150500Z
UID:TALK13667@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Since the advent of supercomputers\, numerical simulations for
  complicated phenomena have been made possible by applying their powerful 
 computational capability. They gave it outstanding contributions to reveal
  the unknown in the wide variety of science and engineering fields\, espec
 ially in turbulence.\n\nThe spectral method has a large number of floating
  point operations in kernel loops and therefore requires high\nmemory band
 width between CPU and memory\, as well as CPU performance. Moreover\, sinc
 e data transposition of 3-dimensional data array among parallel elements a
 ppears in parallel computation of the method\, high bi-sectional bandwidth
  of inter-element network is also required.  Therefore\, it is the essenti
 al and important method to consider the HPC systems\n\nThe recent trend of
  HPC systems which have more than ten thousand of parallel computational e
 lements with low peak performance and low electricity\, however\, brings u
 s some difficulties such as fine-grain parallelisation and low efficiency 
 of computation in using HPC systems for the turbulence simulations. Longer
  simulation time will be requested if the systems have great peak performa
 nce like PFLOPS class. The trade-off between high performance capability a
 nd low electric power is essential issue in designing the HPC systems.\n\n
 We will discuss a possibility of higher resolution turbulence simulations 
 by referring a recent trend of HPC\nsystems and a development project of H
 PC system in Japan.
LOCATION:Seminar Room 1\, Newton Institute
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