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: MPI
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
  7.2694e-02   0.10   0.10   0.20 
Three Fastest
Protocols
1st2nd3rd
  a6   a2   a1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   5   25 

2x32 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  6.6061e-02   0.15   0.16   0.37 
Three Fastest
Protocols
1st2nd3rd
  a1   a0   c3 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   4   23 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.4053e-01   0.04   0.04   0.06 
Three Fastest
Protocols
1st2nd3rd
  c1   a1   a0 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   20   25 

4x16 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.6407e-01   0.07   0.08   0.10 
Three Fastest
Protocols
1st2nd3rd
  a1   c1   a5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   7   25 

2x32 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.3689e-01   0.11   0.11   0.20 
Three Fastest
Protocols
1st2nd3rd
  a1   c1   a5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   25 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.8694e+00   0.03   0.03   0.06 
Three Fastest
Protocols
1st2nd3rd
  a1   c1   a4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   24   25 

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