. PSTSWM T3E-900 Algorithm Comparison

Performance Studies using

PSTSWM

SGI/Cray Research T3E-900 Algorithm Comparison

(transpose LT experiment II-A )

Date/Person: May 11, 1998 / P. Worley
Platform: T3E-900 at National Energy Research Scientific Computing Center (mcurie.nersc.gov):
   532 450-MHz DEC Alpha EV5 RISC processors
Environment: UNICOS/mk 2.0.2.28
mpt 1.2.0.2
Cray CF90 Version 3.0.2.1
Code Version: 6.3
Compilation Options: -dp -Oscalar3 -Wl,-Dstreams=on
Math Library: libsci
Communication Library: MPI
SHMEM
Number of Timesteps: 12
Results:

Transpose LT (2) (mpi)
Algorithm Comparison
  T42L1     T21L2     T42L2     T85L2     T85L1     T85L4  
  P=32     P=16     P=8     P=32     P=16     P=8  
  optimal algorithm   alltoallv  alltoallv  alltoallv  alltoallv  alltoallv  swtrans 
  (alltoallv-min)/min     0.000    0.000    0.000    0.000    0.000    0.074 
  (generic-min)/min     1.240    0.651    0.128    0.207    0.143    0.087 

Transpose LT (2) (shmem)
Algorithm Comparison
  T42L1     T21L2     T42L2     T85L2     T85L1     T85L4  
  P=32     P=16     P=8     P=32     P=16     P=8  
  optimal algorithm   swtrans  swtrans  srtrans  srtrans  srtrans  srtrans 
  (generic-min)/min     0.440    0.224    0.076    0.093    0.059    0.025 

Transpose LT (2)
Communication Library Comparisons
  T42L1     T21L2     T42L2     T85L2     T85L1     T85L4  
  P=32     P=16     P=8     P=32     P=16     P=8  
  optimal library   shmem  shmem  shmem  shmem  shmem  mpi 
  (alltoallv-min)/min     0.086    0.077    0.022    0.050    0.068    0.074 
  (mpi-min)/min     0.086    0.077    0.022    0.050    0.068    0.000 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:28:52 EDT.