PSTSWM SP3-200 Communication Protocol Performance

Performance Studies using

PSTSWM

IBM SP3-200 Protocol Performance

(transpose FFT experiment C / O(P) swap 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: swtrans
Number of Timesteps: 12
Results:

16x4 Processors (Column Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.5167e-01   0.39   0.34   0.91 
Three Fastest
Protocols
1st2nd3rd
  e4   e3   e5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   3   8 

32x2 Processors (Column Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.0162e-01   0.55   0.54   0.91 
Three Fastest
Protocols
1st2nd3rd
  e4   e3   e5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   1   5 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.4064e-01   0.09   0.08   0.27 
Three Fastest
Protocols
1st2nd3rd
  a5   a4   c4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   8   30 

16x4 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.9893e-01   0.17   0.17   0.31 
Three Fastest
Protocols
1st2nd3rd
  e4   e3   c4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   6   20 

32x2 Processors (Column Major Ordering) / Problem T42L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  6.2175e-01   0.22   0.19   0.48 
Three Fastest
Protocols
1st2nd3rd
  e4   e5   c5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   5   19 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.9179e+00   0.08   0.08   0.38 
Three Fastest
Protocols
1st2nd3rd
  a5   a4   b6 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   10   30 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:17:09 EDT.