PSTSWM T3E-900 Communication Protocol Performance

Performance Studies using

PSTSWM

SGI/Cray Research T3E-900 Protocol Performance

(transpose LT experiment I-C / O(P) sendrecv transpose 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: srtrans
(assuming distributed FFT)
Number of Timesteps: 12
Results:

4x16 Processors (Column Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.4485e-01   0.13   0.11   0.34 
Three Fastest
Protocols
1st2nd3rd
  a6   a0   b0 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   3   29 

2x32 Processors (Column Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.9325e-01   0.17   0.18   0.43 
Three Fastest
Protocols
1st2nd3rd
  a6   e0   b0 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   6   24 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.3196e-01   0.40   0.04   11.25 
Three Fastest
Protocols
1st2nd3rd
  e0   a0   c1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   19   30 

4x16 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.0512e-01   0.07   0.07   0.17 
Three Fastest
Protocols
1st2nd3rd
  a6   e0   e2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   12   31 

2x32 Processors (Column Major Ordering) / Problem T42L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  6.7343e-01   0.08   0.08   0.20 
Three Fastest
Protocols
1st2nd3rd
  a6   a0   e2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   11   31 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.6649e+00   0.01   0.01   0.03 
Three Fastest
Protocols
1st2nd3rd
  c1   e0   a6 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  16   31   31 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:27:54 EDT.