PSTSWM T3E-900 Communication Protocol Performance

Performance Studies using

PSTSWM


SGI/Cray Research T3E-900 Protocol Performance

(transpose LT experiment II-A / O(P) sendrecv transpose algorithm)

Date/Person: May 8, 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: srtrans
(assuming transpose FFT)
Number of Timesteps: 12
Results:

1x16 Processors / Problem T21L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.3455e-02   0.16   0.13   0.77 
Three Fastest
Protocols
1st2nd3rd
  e2   c1   c2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   4   11 

1x32 Processors / Problem T42L1
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.2809e-02   0.12   0.18   0.27 
Three Fastest
Protocols
1st2nd3rd
  c1   e2   e1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   5   11 

1x8 Processors / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.8487e-01   0.03   0.03   0.08 
Three Fastest
Protocols
1st2nd3rd
  c2   e1   a1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   10   12 

1x16 Processors / Problem T85L1
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.2433e-01   0.03   0.03   0.06 
Three Fastest
Protocols
1st2nd3rd
  e1   c1   a1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  4   9   12 

1x32 Processors / Problem T85L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.3916e-01   0.04   0.04   0.09 
Three Fastest
Protocols
1st2nd3rd
  c1   e1   c2 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   8   12 

1x8 Processors / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.3826e+00   0.01   0.01   0.02 
Three Fastest
Protocols
1st2nd3rd
  c1   c2   e1 
      Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  7   12   12 


Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:28:08 EDT.