PSTSWM Origin2000 Communication Protocol Performance

Performance Studies using

PSTSWM

SGI/Cray Research Origin2000 Protocol Performance

(distributed LT experiment C / recursive halving sum algorithm)

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: SHMEM
Parallel Algorithm: halfsum
Number of Timesteps: 12
Results:

4x16 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.6633e-02   0.10   0.08   0.18 
Three Fastest
Protocols
1st2nd3rd
  a1   c1   b1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   10 

2x32 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  5.4074e-02   0.09   0.10   0.21 
Three Fastest
Protocols
1st2nd3rd
  a1   c1   d1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   3   10 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.0421e-01   0.03   0.03   0.07 
Three Fastest
Protocols
1st2nd3rd
  a1   c1   d1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   8   10 

4x16 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.5411e-01   0.08   0.06   0.16 
Three Fastest
Protocols
1st2nd3rd
  c1   a1   d1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   10 

2x32 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.8790e-01   0.15   0.15   0.29 
Three Fastest
Protocols
1st2nd3rd
  a1   c1   b1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   8 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.6833e+00   0.03   0.03   0.07 
Three Fastest
Protocols
1st2nd3rd
  a1   c1   b1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   7   10 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:08:11 EDT.