PSTSWM Origin2000 Algorithm Comparison

Performance Studies using

PSTSWM

SGI/Cray Research Origin2000 Algorithm Comparison

(transpose LT experiment II-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
(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  srtrans 
  (alltoallv-min)/min     0.000    0.399 
  (generic-min)/min     0.054    0.001 

Transpose LT (2) (shmem) / Column Major Processor Ordering
Algorithm Comparison
  T42L16    T85L32 
  P=8x8     P=8x8  
  optimal algorithm   swtrans  swtrans 
  (generic-min)/min     0.067    0.043 

Transpose LT (2) (combined) / Column Major Processor Ordering
Communication Library Comparisons
  T42L16    T85L32 
  P=8x8     P=8x8  
  optimal library   alltoallv  mpi 
  (alltoallv-min)/min     0.000    0.399 
  (mpi-min)/min     0.000    0.000 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:07:31 EDT.