PSTSWM T3E-900 Communication Protocol Performance

Performance Studies using

PSTSWM

SGI/Cray Research T3E-900 Protocol Performance

(distributed LT experiment B / 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: SHMEM
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
  5.1186e-02   0.09   0.06   0.23 
Three Fastest
Protocols
1st2nd3rd
  i2   i1   a1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   8   19 

2x32 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  6.0206e-02   0.13   0.09   0.40 
Three Fastest
Protocols
1st2nd3rd
  a1   c1   i1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   7   15 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.7360e-01   0.04   0.04   0.08 
Three Fastest
Protocols
1st2nd3rd
  i2   f2   f1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   12   19 

4x16 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.5493e-01   0.07   0.07   0.14 
Three Fastest
Protocols
1st2nd3rd
  i2   f2   i1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   6   19 

2x32 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.6617e-01   0.12   0.12   0.26 
Three Fastest
Protocols
1st2nd3rd
  i2   f2   i1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   4   17 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.7197e+00   0.02   0.03   0.04 
Three Fastest
Protocols
1st2nd3rd
  f2   f1   i2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  6   19   19 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:25:33 EDT.