PSTSWM T3E-900 Communication Protocol Performance

Performance Studies using

PSTSWM


SGI/Cray Research T3E-900 Protocol Performance

(distributed LT experiment B / exchange 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: exchsum
Number of Timesteps: 12
Results:

4x16 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  5.3455e-02   0.08   0.05   0.25 
Three Fastest
Protocols
1st2nd3rd
  c2   d6   d2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   5   10 

2x32 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  7.5167e-02   0.13   0.08   0.48 
Three Fastest
Protocols
1st2nd3rd
  c2   d2   d6 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   4   8 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.6972e-01   0.04   0.03   0.10 
Three Fastest
Protocols
1st2nd3rd
  c2   d2   a1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   8   10 

4x16 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.6253e-01   0.07   0.05   0.21 
Three Fastest
Protocols
1st2nd3rd
  d2   d6   c2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   6   10 

2x32 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  6.6274e-01   0.11   0.06   0.38 
Three Fastest
Protocols
1st2nd3rd
  c2   d2   d6 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   4   8 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.8175e+00   0.02   0.01   0.08 
Three Fastest
Protocols
1st2nd3rd
  d2   c2   d6 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  6   8   10 


Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:24:50 EDT.