PSTSWM SP3-200 Communication Protocol Performance

Performance Studies using

PSTSWM

IBM SP3-200 Protocol Performance

(transpose FFT experiment C / O(P) sendrecv 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: srtrans
Number of Timesteps: 12
Results:

16x4 Processors (Column Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.4206e-01   0.47   0.45   0.87 
Three Fastest
Protocols
1st2nd3rd
  e3   e4   e5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   5 

32x2 Processors (Column Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.0704e-01   0.51   0.47   1.09 
Three Fastest
Protocols
1st2nd3rd
  e4   e5   e3 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   5 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.4376e-01   0.09   0.07   0.29 
Three Fastest
Protocols
1st2nd3rd
  e5   e4   e3 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   9   29 

16x4 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.9470e-01   0.19   0.16   0.39 
Three Fastest
Protocols
1st2nd3rd
  e4   e5   c5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   3   21 

32x2 Processors (Column Major Ordering) / Problem T42L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  6.2477e-01   0.23   0.23   0.80 
Three Fastest
Protocols
1st2nd3rd
  c4   e4   e5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   5   18 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.9097e+00   0.10   0.08   0.84 
Three Fastest
Protocols
1st2nd3rd
  a4   a5   c1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   8   30 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:16:57 EDT.