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: 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
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
  8.0630e-02   0.07   0.04   0.17 
Three Fastest
Protocols
1st2nd3rd
  a6   a2   a3 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   15   25 

2x32 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  7.9570e-02   0.11   0.10   0.23 
Three Fastest
Protocols
1st2nd3rd
  a6   a1   c1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   8   25 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.7252e-01   0.05   0.04   0.15 
Three Fastest
Protocols
1st2nd3rd
  c1   a1   a0 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   17   25 

4x16 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.1186e-01   0.05   0.06   0.09 
Three Fastest
Protocols
1st2nd3rd
  a1   c1   a5 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   7   25 

2x32 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  5.6118e-01   0.16   0.12   0.54 
Three Fastest
Protocols
1st2nd3rd
  b3   b2   b5 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   4   20 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.6250e+00   0.08   0.08   0.14 
Three Fastest
Protocols
1st2nd3rd
  a4   a5   c4 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   4   25 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:06:20 EDT.