Vortrag Marianne Winslett, 12.10.98, 17.15 Uhr

[Peter Brezany]

                          UNIVERSITAET WIEN 
          INSTITUT FUER SOFTWARETECHNIK UND PARALLELE SYSTEME
                            gemeinsam mit 
                                VCPC 
           EUROPEAN CENTRE FOR PARALLEL COMPUTING AT VIENNA 


      EINLADUNG ZU EINEM VORTRAG IM RAHMEN DES INSTITUTS-KOLLOQUIUMS:
                

         
                  The Panda Library for Parallel I/O
                  ----------------------------------
                   
		      Prof. Dr. Marianne Winslett
		         University of Illinois
			Urbana-Champaign, IL USA	
		       
      
 		               
                ZEIT: Montag, 12. 10. 1998, 17:15 s.t 
                                             
                                             
        ORT: Institut fuer Softwaretechnik und Parallele Systeme
                  1090 Wien, Liechtensteinstrasse 22, 
                         Seminarraum, Mezzanin


Abstract

High-performance  scientific  applications  often  spend a large 
fraction  of  their run time waiting  for I/O.  However, in  the 
Panda  project, we have  found  that  a  careful analysis of I/O 
bottlenecks,  plus  a  willingness to "think  outside  the  box", 
can lead  to  parallel  I/O  performance   very close to the peak 
limits  imposed  by a  platform's  system hardware  and  software. 
In this  talk,  we describe  the basic approach we  have  taken to 
parallel I/O, known as server-directed I/O. We present performance 
results for reading  and  writing large multidimensional arrays on 
traditional and cluster supercomputers,  and  discuss  the factors 
that affect I/O performance in those environments. As time permits, 
we will also  present an  overview  of our  approach  to  automated 
tuning of our parallel I/O library, Panda, and  discuss the  impact 
on parallel I/O of the need to migrate data to and from a supercom-
puter.