PSTSWM SP3-200 Communication Protocol Performance

Performance Studies using

PSTSWM

IBM SP3-200 Protocol Performance

(transpose LT experiment II-A1 / O(log P) transpose algorithm)

Date/Person: November 28, 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 4.3.2.2;   PSSP 3.1
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
(assuming transpose FFT)
Number of Timesteps: 12
Results:

1x16 Processors / Problem T21L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  3.7106e-02   0.32   0.34   0.58 
Three Fastest
Protocols
1st2nd3rd
  c4   c5   a4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   10 

1x32 Processors / Problem T42L1
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.8480e-02   0.31   0.26   0.59 
Three Fastest
Protocols
1st2nd3rd
  c4   c5   a4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   1   12 

1x8 Processors / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.5842e-01   0.15   0.16   0.32 
Three Fastest
Protocols
1st2nd3rd
  c4   a4   a5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   3   22 

1x16 Processors / Problem T85L1
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.2892e-01   0.13   0.11   0.39 
Three Fastest
Protocols
1st2nd3rd
  a4   a5   c4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   5   22 

1x32 Processors / Problem T85L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.6737e-01   0.15   0.16   0.41 
Three Fastest
Protocols
1st2nd3rd
  a4   a5   c4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   4   21 

1x8 Processors / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.5649e+00   0.09   0.06   0.64 
Three Fastest
Protocols
1st2nd3rd
  a5   a1   a2 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   10   24 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:15:38 EDT.