PSTSWM Origin2000 Algorithm Comparison

Performance Studies using

PSTSWM

SGI/Cray Research Origin2000 Algorithm Comparison

(distributed FFT experiment A)

Date/Person: April 22, 1999 / P. Worley
Platform: SGI Origin2000 at Los Alamos National Laboratory (n12):
   128 250-MHz MIPS R10000 processors
Environment: IRIX 6.5
mpt_1.3.0.0
MIPSpro Compilers: Version 7.2.1
setenv MPI_DSM_MUSTRUN 1
Code Version: 6.4.3
Compilation Options: f77 -64 -i4 -O3
Math Library: SCSL
Communication Library: MPI
SHMEM
Number of Timesteps: 12
Results:

Distributed FFT (mpi)
Algorithm Comparison
  T42L1     T21L2     T42L2     T85L2     T85L1     T85L4  
  P=32     P=16     P=8     P=32     P=16     P=8  
  optimal algorithm   dfft  dfft  dfft  dfft  dfft  dfft 
  (generic-min)/min     0.000    0.000    0.033    0.098    0.008    0.085 

Distributed FFT (shmem)
Algorithm Comparison
  T42L1     T21L2     T42L2     T85L2     T85L1     T85L4  
  P=32     P=16     P=8     P=32     P=16     P=8  
  optimal algorithm   dfft  dfft  dfft  dfft  dfft  dfft 
  (generic-min)/min     0.378    0.174    0.103    0.231    0.132    0.074 

Distributed FFT (combined)
Communication Library Comparisons
  T42L1     T21L2     T42L2     T85L2     T85L1     T85L4  
  P=32     P=16     P=8     P=32     P=16     P=8  
  optimal library   shmem  shmem  shmem  mpi  shmem  shmem 
  (mpi-min)/min     0.080    0.010    0.093    0.000    0.095    0.087 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:07:56 EDT.