PSTSWM AlphaSC-500 Communication Protocol Performance

Performance Studies using

PSTSWM

Compaq AlphaServer SC Protocol Performance

(distributed LT experiment A1 / ring-pipeline sum algorithm)

Date/Person: November 4, 1999 / P. Worley
Platform: Compaq AlphaServer SC at Compaq (fsehpc):
     16 ES40 4-way SMP nodes (500 MHz Alpha 21264 with 4MB L2 cache)
Environment: Digital UNIX V5.0;   RMS 2.3.2
Code Version: 6.6.3
Compilation Options: f90 -O4 -assume accuracy_sensitive -math_library accurate -aling dcommons -align records -arch host -tune host
Math Library: none
Communication Library: MPI
Parallel Algorithm: ringpipe
Number of Timesteps: 12
Results:

1x16 Processors / Problem T21L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.9886e-02   0.30   0.22   1.50 
Three Fastest
Protocols
1st2nd3rd
  d3   g3   d2 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   26 

1x8 Processors / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  7.0914e-02   0.16   0.10   1.26 
Three Fastest
Protocols
1st2nd3rd
  i3   f1   c3 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   9   42 

1x16 Processors / Problem T85L1
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.3104e-01   0.58   0.14   17.99 
Three Fastest
Protocols
1st2nd3rd
  f3   i3   c1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   15   34 

1x8 Processors / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  6.8970e-01   0.10   0.06   0.33 
Three Fastest
Protocols
1st2nd3rd
  c5   f5   i5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  6   21   42 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:03:23 EDT.