PSTSWM SP3-200 Communication Protocol Performance

Performance Studies using

PSTSWM

IBM SP3-200 Protocol Performance

(transpose FFT experiment B2 / O(P) swap transpose algorithm)

Date/Person: June 6, 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: swtrans
Number of Timesteps: 12
Results:

16x4 Processors (Row Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.4630e-01   0.42   0.38   0.78 
Three Fastest
Protocols
1st2nd3rd
  e5   e3   e4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   6 

32x2 Processors (Row Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.0747e-01   0.52   0.52   0.84 
Three Fastest
Protocols
1st2nd3rd
  e4   e3   e5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   2   6 

8x8 Processors (Row Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.5643e-01   0.07   0.05   0.23 
Three Fastest
Protocols
1st2nd3rd
  a4   c4   c5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   14   31 

16x4 Processors (Row Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.0322e-01   0.17   0.15   0.36 
Three Fastest
Protocols
1st2nd3rd
  c4   e4   e5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   5   20 

32x2 Processors (Row Major Ordering) / Problem T42L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  5.8743e-01   0.29   0.28   0.55 
Three Fastest
Protocols
1st2nd3rd
  e4   e5   a4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   1   13 

8x8 Processors (Row Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.1050e+00   0.08   0.07   0.35 
Three Fastest
Protocols
1st2nd3rd
  a1   a5   c1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   5   30 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:17:06 EDT.