PSTSWM Origin2000 Algorithm Comparison

Performance Studies using

PSTSWM

SGI/Cray Research Origin2000 Algorithm Comparison

(transpose LT experiment II-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
(assuming transpose FFT)
Number of Timesteps: 12
Results:

Transpose LT (2) (mpi) / Column Major Processor Ordering
Algorithm Comparison
  T42L16    T85L32 
  P=8x8     P=8x8  
  optimal algorithm   alltoallv  alltoallv 
  (alltoallv-min)/min     0.000    0.000 
  (generic-min)/min     0.077    0.013 

Transpose LT (2) (shmem) / Column Major Processor Ordering
Algorithm Comparison
  T42L16    T85L32 
  P=8x8     P=8x8  
  optimal algorithm   srtrans  srtrans 
  (generic-min)/min     0.055    0.016 

Transpose LT (2) (combined) / Column Major Processor Ordering
Communication Library Comparisons
  T42L16    T85L32 
  P=8x8     P=8x8  
  optimal library   alltoallv  shmem 
  (alltoallv-min)/min     0.000    0.060 
  (mpi-min)/min     0.000    0.060 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:12:38 EDT.