PSTSWM SP3-375 Communication Protocol Performance

Performance Studies using

PSTSWM

IBM SP3-375 Winterhawk II Protocol Performance

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

Date/Person: December 12, 1999 / P. Worley
Platform: IBM SP3 at Oak Ridge National Laboratory (bobcat.ccs.ornl.gov):
     62 4-way Winterhawk II SMP nodes (375 MHz POWER3 with 8MB L2 cache)
Environment: AIX 4.3.3;   PSSP 3.1.1
Code Version: 6.6.4
Compilation Options: mpxlf -O3 -qarch=auto -qtune=auto -qcache=auto
Link Options: -bmaxdata:0x70000000
Environment Variables: export MP_SHARED_MEMORY="yes"
Math Library: ESSL
Communication Library: MPI over the switch using user space for internode communication
MPI using shared memory 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
  1.8995e-01   0.08   0.05   0.22 
Three Fastest
Protocols
1st2nd3rd
  a5   c5   c4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   9   25 

32x2 Processors (Column Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.9389e-01   0.06   0.04   0.12 
Three Fastest
Protocols
1st2nd3rd
  c5   a5   c4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   16   25 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.8598e-01   0.05   0.05   0.18 
Three Fastest
Protocols
1st2nd3rd
  a1   a4   c1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   11   25 

16x4 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  5.6283e-01   0.11   0.12   0.18 
Three Fastest
Protocols
1st2nd3rd
  a5   a4   c1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   5   25 

32x2 Processors (Column Major Ordering) / Problem T42L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  8.4975e-01   0.10   0.09   0.24 
Three Fastest
Protocols
1st2nd3rd
  a4   a1   a5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   5   25 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.3058e+00   0.08   0.09   0.16 
Three Fastest
Protocols
1st2nd3rd
  a4   a1   c1 
       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 10:19:23 EDT.