PSTSWM T3E-900 Communication Protocol Performance

Performance Studies using

PSTSWM

SGI/Cray Research T3E-900 Protocol Performance

(transpose LT experiment I-C / O(log P) 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: logtrans
(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
  1.4043e-01   0.07   0.07   0.13 
Three Fastest
Protocols
1st2nd3rd
  a6   c2   a3 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   6   25 

2x32 Processors (Column Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.8260e-01   0.08   0.09   0.15 
Three Fastest
Protocols
1st2nd3rd
  c0   c6   c2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   4   14 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.4672e-01   0.03   0.04   0.06 
Three Fastest
Protocols
1st2nd3rd
  a0   a1   a6 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   20   25 

4x16 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.1692e-01   0.04   0.05   0.08 
Three Fastest
Protocols
1st2nd3rd
  a6   a0   c2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  4   12   25 

2x32 Processors (Column Major Ordering) / Problem T42L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  7.1277e-01   0.05   0.07   0.09 
Three Fastest
Protocols
1st2nd3rd
  a6   a0   c2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  5   12   25 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.8086e+00   0.02   0.02   0.03 
Three Fastest
Protocols
1st2nd3rd
  c1   a0   a1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  12   25   25 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:25:00 EDT.