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 (Row Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  5.1298e-02   0.08   0.05   0.22 
Three Fastest
Protocols
1st2nd3rd
  i2   a1   i1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   10   19 

2x32 Processors (Row Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  6.0455e-02   0.13   0.07   0.37 
Three Fastest
Protocols
1st2nd3rd
  a1   f1   i1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   7   14 

8x8 Processors (Row Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.7377e-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 (Row Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.5015e-01   0.07   0.07   0.15 
Three Fastest
Protocols
1st2nd3rd
  i2   f2   f1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   6   19 

2x32 Processors (Row Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.7040e-01   0.12   0.11   0.25 
Three Fastest
Protocols
1st2nd3rd
  i2   f2   i1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   4   18 

8x8 Processors (Row Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.7294e+00   0.02   0.02   0.04 
Three Fastest
Protocols
1st2nd3rd
  f2   i2   f1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  4   19   19 


Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:25:32 EDT.