PSTSWM SP3-200 Communication Protocol Performance

Performance Studies using

PSTSWM

IBM SP3-200 Protocol Performance

(distributed LT experiment B2 / exchange sum 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: exchsum
Number of Timesteps: 12
Results:

4x16 Processors (Row Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.2903e-01   0.13   0.13   0.26 
Three Fastest
Protocols
1st2nd3rd
  a4   a0   c1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   5   24 

2x32 Processors (Row Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.5931e-01   0.18   0.16   0.44 
Three Fastest
Protocols
1st2nd3rd
  a4   a5   c4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   4   16 

8x8 Processors (Row Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  5.2835e-01   0.06   0.06   0.18 
Three Fastest
Protocols
1st2nd3rd
  a4   a0   a1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   11   25 

4x16 Processors (Row Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  7.0638e-01   0.09   0.09   0.17 
Three Fastest
Protocols
1st2nd3rd
  a1   c1   a4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   3   25 

2x32 Processors (Row Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  9.7104e-01   0.34   0.37   0.60 
Three Fastest
Protocols
1st2nd3rd
  a1   a4   a5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   2   5 

8x8 Processors (Row Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.9038e+00   0.06   0.06   0.10 
Three Fastest
Protocols
1st2nd3rd
  a4   a5   a1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   8   25 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:15:11 EDT.