PSTSWM SP3-375 Communication Protocol Performance

Performance Studies using

PSTSWM

IBM SP3-375 Winterhawk II Protocol Performance

(transpose FFT experiment A / O(log P) transpose 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: logtrans
Number of Timesteps: 12
Results:

16x1 Processors / Problem T10L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.2256e-01   0.11   0.09   0.20 
Three Fastest
Protocols
1st2nd3rd
  c4   c5   d4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   4   25 

32x1 Processors / Problem T10L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.0859e-01   0.07   0.07   0.13 
Three Fastest
Protocols
1st2nd3rd
  c5   c4   d5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   7   25 

8x1 Processors / Problem T21L8
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.4612e-01   0.09   0.09   0.18 
Three Fastest
Protocols
1st2nd3rd
  c4   c5   c2 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   6   25 

16x1 Processors / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.5891e-01   0.09   0.08   0.17 
Three Fastest
Protocols
1st2nd3rd
  c4   c5   c2 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   3   25 

32x1 Processors / Problem T21L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.2653e-01   0.08   0.08   0.18 
Three Fastest
Protocols
1st2nd3rd
  c4   c5   a5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   6   25 

8x1 Processors / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.1074e+00   0.04   0.04   0.13 
Three Fastest
Protocols
1st2nd3rd
  a6   a2   a3 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  9   17   25 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:19:21 EDT.