PSTSWM T3E-900 Communication Protocol Performance

Performance Studies using

PSTSWM

SGI/Cray Research T3E-900 Protocol Performance

(distributed LT experiment C / ring-pipeline sum 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: ringpipe
Number of Timesteps: 12
Results:

4x16 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  9.3918e-02   0.24   0.23   0.70 
Three Fastest
Protocols
1st2nd3rd
  a6   a0   c0 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   28 

2x32 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.2092e-01   0.41   0.43   1.02 
Three Fastest
Protocols
1st2nd3rd
  a6   a0   c0 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   1   16 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.7651e-01   0.07   0.07   0.14 
Three Fastest
Protocols
1st2nd3rd
  c0   i2   c2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   19   50 

4x16 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.4634e-01   0.11   0.10   0.26 
Three Fastest
Protocols
1st2nd3rd
  c0   i2   f2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   12   49 

2x32 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.9367e-01   0.19   0.17   0.44 
Three Fastest
Protocols
1st2nd3rd
  c0   f2   i2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   5   34 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.9907e+00   0.03   0.04   0.07 
Three Fastest
Protocols
1st2nd3rd
  c0   c3   i3 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  9   37   50 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:25:30 EDT.