PSTSWM Origin2000 Algorithm Comparison

Performance Studies using

PSTSWM

SGI/Cray Research Origin2000 Algorithm Comparison

(distributed LT experiment I-A )

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
Number of Timesteps: 12
Results:

Distributed LT (1) (mpi)
Algorithm Comparison
  T42L1     T21L2     T42L2     T85L2     T85L1     T85L4  
  P=32     P=16     P=8     P=32     P=16     P=8  
  optimal algorithm   halfsum  halfsum  ringpipe  ringpipe  ringpipe  ringpipe 
  (allreduce-min)/min     0.974    0.734    0.445    1.451    0.705    0.577 
  (generic-min)/min     1.354    0.528    0.195    0.236    0.209    0.215 

Distributed LT (1) (shmem)
Algorithm Comparison
  T42L1     T21L2     T42L2     T85L2     T85L1     T85L4  
  P=32     P=16     P=8     P=32     P=16     P=8  
  optimal algorithm   halfsum  halfsum  ringpipe  ringpipe  ringpipe  ringpipe 
  (generic-min)/min     0.651    0.468    0.257    0.748    0.433    0.317 

Distributed LT (1) (combined)
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  shmem 
  (allreduce-min)/min     1.471    1.111    0.487    1.803    0.884    0.635 
  (mpi-min)/min     0.252    0.217    0.029    0.144    0.105    0.037 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:07:59 EDT.