PSTSWM SP3-200 Communication Protocol Performance

Performance Studies using

PSTSWM

IBM SP3-200 Protocol Performance

(transpose FFT experiment C / O(log P) transpose algorithm)

Date/Person: June 8, 1999 / P. Worley
Platform: IBM SP3 at Oak Ridge National Laboratory (morgan.ccs.ornl.gov):
     62 2-way Winterhawk I SMP nodes (200 MHz POWER3 with 4MB L2 cache, equivalent to RS/6000 Model 260)
Environment: AIX 4.3.2;   PSSP 3.1
Code Version: 6.5
Compilation Options: mpxlf -O3 -qarch=auto -qtune=auto -qcache=auto
Link Options: -bmaxdata:0x70000000
Math Library: ESSL
Communication Library: MPI over the switch using user space for internode communication
MPI using IP for intranode communication
Parallel Algorithm: logtrans
Number of Timesteps: 12
Results:

16x4 Processors (Column Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.6764e-01   0.14   0.12   0.27 
Three Fastest
Protocols
1st2nd3rd
  a4   a5   c5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   4   23 

32x2 Processors (Column Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.5945e-01   0.13   0.15   0.26 
Three Fastest
Protocols
1st2nd3rd
  c4   a4   c5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   3   24 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  5.0460e-01   0.08   0.08   0.23 
Three Fastest
Protocols
1st2nd3rd
  c4   a4   a5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  4   6   25 

16x4 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.9251e-01   0.10   0.11   0.17 
Three Fastest
Protocols
1st2nd3rd
  a1   a4   c1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   5   25 

32x2 Processors (Column Major Ordering) / Problem T42L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  9.0224e-01   0.14   0.14   0.24 
Three Fastest
Protocols
1st2nd3rd
  c1   a1   a5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   1   25 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.4935e+00   0.09   0.10   0.15 
Three Fastest
Protocols
1st2nd3rd
  a4   a5   a1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   4   25 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:15:36 EDT.