PSTSWM T3E-900 Communication Protocol Performance

Performance Studies using

PSTSWM

SGI/Cray Research T3E-900 Protocol Performance

(transpose FFT experiment 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
Number of Timesteps: 12
Results:

16x4 Processors (Column Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.2708e-01   0.12   0.10   0.37 
Three Fastest
Protocols
1st2nd3rd
  a6   a0   a3 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   11   28 

32x2 Processors (Column Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.1513e-01   0.15   0.13   0.42 
Three Fastest
Protocols
1st2nd3rd
  e0   a6   e2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   6   25 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.6968e-01   0.05   0.05   0.10 
Three Fastest
Protocols
1st2nd3rd
  e2   e0   c1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  5   16   31 

16x4 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.3722e-01   0.07   0.08   0.18 
Three Fastest
Protocols
1st2nd3rd
  e0   e2   a0 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  8   13   31 

32x2 Processors (Column Major Ordering) / Problem T42L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  7.1573e-01   0.09   0.07   0.69 
Three Fastest
Protocols
1st2nd3rd
  c1   e0   a0 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  5   13   30 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.1298e+00   0.02   0.02   0.04 
Three Fastest
Protocols
1st2nd3rd
  c1   a6   a0 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  10   31   31 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:28:01 EDT.