PSTSWM Origin2000 Algorithm Comparison

Performance Studies using

PSTSWM

SGI/Cray Research Origin2000 Algorithm Comparison

(transpose FFT experiment C)

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:

Transpose FFT (mpi) / Column Major Processor Ordering
Algorithm Comparison
  T21L16    T42L16    T42L32    T42L16    T85L32 
  P=16x4     P=8x8     P=32x2     P=16x4     P=8x8  
  optimal algorithm   logtrans  srtrans  srtrans  swtrans  swtrans 
  (alltoallv-min)/min     0.139    0.026    1.429    0.619    0.072 
  (generic-min)/min     0.143    0.033    0.040    0.033    0.008 

Transpose FFT (shmem) / Column Major Processor Ordering
Algorithm Comparison
  T21L16    T42L16    T42L32    T42L16    T85L32 
  P=16x4     P=8x8     P=32x2     P=16x4     P=8x8  
  optimal algorithm   swtrans  swtrans  swtrans  swtrans  swtrans 
  (generic-min)/min     0.069    0.122    0.079    0.089    0.060 

Transpose FFT (combined) / Column Major Processor Ordering
Communication Library Comparisons
  T21L16    T42L16    T42L32    T42L16    T85L32 
  P=16x4     P=8x8     P=32x2     P=16x4     P=8x8  
  optimal library   shmem  shmem  shmem  shmem  shmem 
  (alltoallv-min)/min     0.423    0.149    1.460    0.719    0.162 
  (mpi-min)/min     0.249    0.120    0.013    0.062    0.084 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:12:34 EDT.