PSTSWM SP3-200 Communication Protocol Performance

Performance Studies using

PSTSWM

IBM SP3-200 Protocol Performance

(distributed LT experiment C / exchange sum 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: exchsum
Number of Timesteps: 12
Results:

4x16 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.2111e-01   0.14   0.10   0.41 
Three Fastest
Protocols
1st2nd3rd
  a5   c4   c5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   5   23 

2x32 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.6373e-01   0.12   0.13   0.27 
Three Fastest
Protocols
1st2nd3rd
  a4   a5   a1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   4   24 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.8722e-01   0.07   0.07   0.18 
Three Fastest
Protocols
1st2nd3rd
  a4   c1   a1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   6   25 

4x16 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  6.1303e-01   0.08   0.08   0.25 
Three Fastest
Protocols
1st2nd3rd
  a4   a1   c1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   8   25 

2x32 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.0967e+00   0.13   0.11   0.25 
Three Fastest
Protocols
1st2nd3rd
  a4   a5   a1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   3   23 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.5423e+00   0.06   0.06   0.11 
Three Fastest
Protocols
1st2nd3rd
  a5   a1   a4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   11   25 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:15:14 EDT.