PSTSWM SP3-375 Communication Protocol Performance

Performance Studies using

PSTSWM

IBM SP3-375 Winterhawk II Protocol Performance

(distributed LT experiment A / ring-pipeline sum algorithm)

Date/Person: December 12, 1999 / P. Worley
Platform: IBM SP3 at Oak Ridge National Laboratory (bobcat.ccs.ornl.gov):
     62 4-way Winterhawk II SMP nodes (375 MHz POWER3 with 8MB L2 cache)
Environment: AIX 4.3.3;   PSSP 3.1.1
Code Version: 6.6.4
Compilation Options: mpxlf -O3 -qarch=auto -qtune=auto -qcache=auto
Link Options: -bmaxdata:0x70000000
Environment Variables: export MP_SHARED_MEMORY="yes"
Math Library: ESSL
Communication Library: MPI over the switch using user space for internode communication
MPI using shared memory for intranode communication
Parallel Algorithm: ringpipe
Number of Timesteps: 12
Results:

1x16 Processors / Problem T21L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.4224e-02   0.48   0.27   1.65 
Three Fastest
Protocols
1st2nd3rd
  i2   f2   c0 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   5   24 

1x32 Processors / Problem T42L1
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.7918e-02   0.52   0.38   1.78 
Three Fastest
Protocols
1st2nd3rd
  i2   c0   f2 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   4   22 

1x8 Processors / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  5.2918e-02   0.40   0.44   0.84 
Three Fastest
Protocols
1st2nd3rd
  i4   f4   i5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   5   12 

1x16 Processors / Problem T85L1
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  9.0374e-02   0.54   0.60   1.08 
Three Fastest
Protocols
1st2nd3rd
  i5   i4   f5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   5   8 

1x32 Processors / Problem T85L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.6344e-01   0.57   0.67   1.22 
Three Fastest
Protocols
1st2nd3rd
  i5   f4   f5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   4   8 

1x8 Processors / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.7811e-01   0.14   0.10   0.59 
Three Fastest
Protocols
1st2nd3rd
  a6   a2   f5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   8   40 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:19:30 EDT.