PSTSWM SP2-66 Algorithm Comparison

Performance Studies using

PSTSWM

IBM SP2-66 Algorithm Comparison

(transpose FFT experiment A2 )

Date/Person: March 22, 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: 6.0
Compilation Options: mpxlf -O3 -qarch=pwr2
Math Library: none
Communication Library: MPI
MPL
Number of Timesteps: 12
Results:

Transpose FFT (mpi)
Algorithm Comparison
  T10L16    T21L8     T21L16    T42L16 
  P=16     P=8     P=16     P=8  
  optimal algorithm   swtrans  srtrans  srtrans  swtrans 
  (generic-min)/min     0.167    0.136    0.133    0.009 

Transpose FFT (mpl)
Algorithm Comparison
  T10L16    T21L8     T21L16    T42L16 
  P=16     P=8     P=16     P=8  
  optimal algorithm   srtrans  srtrans  srtrans  swtrans 
  (generic-min)/min     0.316    0.085    0.098    0.015 

Transpose FFT (combined)
Communication Library Comparisons
  T10L16    T21L8     T21L16    T42L16 
  P=16     P=8     P=16     P=8  
  optimal library   mpi  mpi  mpl  mpl 
  (mpi-min)/min     0.000    0.000    0.006    0.024 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:14:06 EDT.