PSTSWM Origin2000 Algorithm Comparison

Performance Studies using

PSTSWM

SGI/Cray Research Origin2000 Algorithm Comparison

(transpose LT experiment I-A )

Date/Person: May 8, 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
(assuming distributed FFT)
Number of Timesteps: 12
Results:

Transpose LT (1) (mpi)
Algorithm Comparison
  T10L16    T21L8     T21L32    T21L16    T42L16 
  P=16     P=8     P=32     P=16     P=8  
  optimal algorithm   logtrans  swtrans  swtrans  swtrans  swtrans 
  (alltoallv-min)/min     0.136    0.066    0.914    0.180    0.236 
  (generic-min)/min     0.078    0.009    0.024    0.037    0.005 

Transpose LT (1) (shmem)
Algorithm Comparison
  T10L16    T21L8     T21L32    T21L16    T42L16 
  P=16     P=8     P=32     P=16     P=8  
  optimal algorithm   swtrans  swtrans  swtrans  swtrans  srtrans 
  (generic-min)/min     0.223    0.083    0.192    0.131    0.078 

Transpose LT (1) (combined)
Communication Library Comparisons
  T10L16    T21L8     T21L32    T21L16    T42L16 
  P=16     P=8     P=32     P=16     P=8  
  optimal library   shmem  shmem  shmem  shmem  mpi 
  (alltoallv-min)/min     0.571    0.127    1.869    0.305    0.236 
  (mpi-min)/min     0.383    0.058    0.499    0.106    0.000 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:07:29 EDT.