PSTSWM T3E-900 Communication Protocol Performance

Performance Studies using

PSTSWM

SGI/Cray Research T3E-900 Protocol Performance

(distributed FFT experiment C)

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: distributed FFT
Number of Timesteps: 12
Results:

16x4 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  6.1755e-02   0.25   0.25   0.65 
Three Fastest
Protocols
1st2nd3rd
  a0   a6   a2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   2   13 

32x2 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  6.5006e-02   0.30   0.30   0.65 
Three Fastest
Protocols
1st2nd3rd
  a0   a6   a2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   7 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.8021e-01   0.06   0.04   0.14 
Three Fastest
Protocols
1st2nd3rd
  a6   a0   a1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   15   26 

16x4 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.8966e-01   0.07   0.04   0.16 
Three Fastest
Protocols
1st2nd3rd
  a0   a6   a1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   15   26 

32x2 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.1405e-01   0.07   0.04   0.18 
Three Fastest
Protocols
1st2nd3rd
  a0   a6   a1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   15   26 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.1792e+00   0.04   0.02   0.11 
Three Fastest
Protocols
1st2nd3rd
  c0   d3   c2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  11   19   26 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:24:31 EDT.