PSTSWM SP3-200 Communication Protocol Performance

Performance Studies using

PSTSWM

IBM SP3-200 Protocol Performance

(distributed LT experiment C / ring 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: ringsum
Number of Timesteps: 12
Results:

4x16 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.4082e-01   0.25   0.18   0.56 
Three Fastest
Protocols
1st2nd3rd
  c5   c4   a4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   2   16 

2x32 Processors (Column Major Ordering) / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.3060e-01   0.80   0.63   1.43 
Three Fastest
Protocols
1st2nd3rd
  c4   c5   a5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   1   2 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.6583e-01   0.08   0.07   0.15 
Three Fastest
Protocols
1st2nd3rd
  c4   a4   c5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   11   25 

4x16 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.6841e-01   0.22   0.21   0.51 
Three Fastest
Protocols
1st2nd3rd
  c4   c5   a4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   15 

2x32 Processors (Column Major Ordering) / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  5.6260e-01   0.39   0.40   0.70 
Three Fastest
Protocols
1st2nd3rd
  c4   c5   a4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   8 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.1822e+00   0.05   0.05   0.11 
Three Fastest
Protocols
1st2nd3rd
  c4   c3   a2 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  4   12   25 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:16:36 EDT.