PSTSWM T3E-900 Communication Protocol Performance

Performance Studies using

PSTSWM

SGI/Cray Research T3E-900 Protocol Performance

(transpose LT experiment II-A / O(log P) transpose algorithm)

Date/Person: May 8, 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: SHMEM
Parallel Algorithm: logtrans
(assuming transpose FFT)
Number of Timesteps: 12
Results:

1x16 Processors / Problem T21L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.7674e-02   0.16   0.13   0.54 
Three Fastest
Protocols
1st2nd3rd
  a1   c2   a2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   3   8 

1x32 Processors / Problem T42L1
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.2808e-02   0.11   0.11   0.24 
Three Fastest
Protocols
1st2nd3rd
  a1   a2   c2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   3   10 

1x8 Processors / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.3032e-01   0.05   0.04   0.18 
Three Fastest
Protocols
1st2nd3rd
  c2   a1   a2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   8   10 

1x16 Processors / Problem T85L1
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.8278e-01   0.05   0.03   0.17 
Three Fastest
Protocols
1st2nd3rd
  a1   c2   a2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   8   10 

1x32 Processors / Problem T85L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.1181e-01   0.06   0.05   0.19 
Three Fastest
Protocols
1st2nd3rd
  c2   a1   a2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   6   10 

1x8 Processors / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.7031e+00   0.04   0.02   0.14 
Three Fastest
Protocols
1st2nd3rd
  a1   a2   c2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   8   10 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:25:14 EDT.