PSTSWM T3E-900 Communication Protocol Performance

Performance Studies using

PSTSWM

SGI/Cray Research T3E-900 Protocol Performance

(distributed LT experiment C / exchange sum algorithm)

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
Parallel Algorithm: exchsum
Number of Timesteps: 12
Results:

4x16 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  7.7500e-02   0.12   0.14   0.39 
Three Fastest
Protocols
1st2nd3rd
  a6   a0   c2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   5   24 

2x32 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.0491e-01   0.12   0.12   0.28 
Three Fastest
Protocols
1st2nd3rd
  a6   a0   a2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   7   24 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.5928e-01   0.04   0.05   0.07 
Three Fastest
Protocols
1st2nd3rd
  c1   a1   a0 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   13   25 

4x16 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  5.5340e-01   0.04   0.06   0.07 
Three Fastest
Protocols
1st2nd3rd
  c2   c1   c3 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   12   25 

2x32 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  8.0334e-01   0.06   0.09   0.11 
Three Fastest
Protocols
1st2nd3rd
  c2   c1   c4 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   12   25 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.1595e+00   0.02   0.02   0.03 
Three Fastest
Protocols
1st2nd3rd
  c2   c1   c3 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   25   25 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:24:46 EDT.