PSTSWM Origin2000 Algorithm Comparison

Performance Studies using

PSTSWM

SGI/Cray Research Origin2000 Algorithm Comparison

(transpose FFT experiment C)

Date/Person: May 11, 1998 / P. Worley
Platform: SGI Origin2000 at Los Alamos National Laboratory (nirvana11):
   128 195-MHz MIPS R10000 processors
Environment: IRIX 6.5
mpt_1.2.0.1
MIPSpro Compilers: Version MIPS pro_7.2
Code Version: 6.3
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  swtrans  srtrans  srtrans 
  (alltoallv-min)/min     0.177    0.063    1.760    0.900    0.557 
  (generic-min)/min     0.127    0.028    0.025    0.026    0.019 

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   srtrans  swtrans  swtrans  swtrans  swtrans 
  (generic-min)/min     0.166    0.062    0.149    0.094    0.079 

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  mpi  shmem  shmem  mpi 
  (alltoallv-min)/min     1.393    0.063    2.281    1.080    0.557 
  (mpi-min)/min     1.033    0.000    0.189    0.095    0.000 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:07:26 EDT.