PSTSWM SP2-66 Algorithm Comparison

Performance Studies using

PSTSWM

IBM SP2-66 Algorithm Comparison

(distributed LT experiment II-A1 )

Date/Person: July 29, 1996 / P. Worley
Platform: IBM SP2 at NASA Ames Research Center (babbage.nas.nasa.gov):
   160 RS6000/590 nodes ("wide", 66.7 MHz POWER2 RISC chip set)
Environment: AIX 4.1.3.3;   POE 2.1.0.8
Code Version: 6.1
Compilation Options: mpxlf -O3 -qarch=pwr2
Math Library: ESSL
Communication Library: MPI
MPL
Number of Timesteps: 12
Results:

Distributed LT (2) (mpi)
Algorithm Comparison
  T21L2     T42L2     T85L1     T85L4  
  P=16     P=8     P=16     P=8  
  optimal algorithm   halfsum  halfsum  halfsum  halfsum 
  (generic-min)/min     0.464    0.456    0.212    0.055 

Distributed LT (2) (mpl)
Algorithm Comparison
  T21L2     T85L1  
  P=16     P=16  
  optimal algorithm   halfsum  halfsum 
  (generic-min)/min     0.668    0.642 

Distributed LT (2) (combined)
Communication Library Comparisons
  T21L2     T42L2     T85L1     T85L4  
  P=16     P=8     P=16     P=8  
  optimal library   mpl  mpi  mpl  mpi 
  (mpi-min)/min     0.068    0.000    0.018    0.000 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:13:06 EDT.