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: MPI
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
  9.0528e-02   0.27   0.26   0.70 
Three Fastest
Protocols
1st2nd3rd
  a6   c0   a0 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   3   25 

2x32 Processors (Row Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.2036e-01   0.42   0.45   1.06 
Three Fastest
Protocols
1st2nd3rd
  a6   c0   a0 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   16 

8x8 Processors (Row Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.7811e-01   0.06   0.06   0.14 
Three Fastest
Protocols
1st2nd3rd
  i2   c0   c2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   23   50 

4x16 Processors (Row Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.4648e-01   0.10   0.09   0.25 
Three Fastest
Protocols
1st2nd3rd
  c0   i2   f2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   13   49 

2x32 Processors (Row Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.9577e-01   0.19   0.17   0.43 
Three Fastest
Protocols
1st2nd3rd
  c0   f2   i2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   4   34 

8x8 Processors (Row Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.9896e+00   0.03   0.04   0.07 
Three Fastest
Protocols
1st2nd3rd
  c2   c0   i2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  10   35   50 


Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:25:29 EDT.