PSTSWM SP3-200 Communication Protocol Performance

Performance Studies using

PSTSWM

IBM SP3-200 Protocol Performance

(transpose LT experiment I-A1 / O(P) sendrecv 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: srtrans
(assuming distributed FFT)
Number of Timesteps: 12
Results:

1x16 Processors / Problem T10L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  9.4843e-02   0.37   0.43   0.77 
Three Fastest
Protocols
1st2nd3rd
  e0   e1   e2 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   4   13 

1x8 Processors / Problem T21L8
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.3361e-01   0.36   0.34   0.69 
Three Fastest
Protocols
1st2nd3rd
  e4   e5   e3 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   7 

1x16 Processors / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.8534e-01   0.31   0.27   0.58 
Three Fastest
Protocols
1st2nd3rd
  e4   e3   e5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   3   14 

1x32 Processors / Problem T21L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.6456e-01   0.49   0.44   0.83 
Three Fastest
Protocols
1st2nd3rd
  e3   e4   e5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   1   3 

1x8 Processors / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.0116e+00   0.14   0.11   0.93 
Three Fastest
Protocols
1st2nd3rd
  e5   e3   a4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   5   29 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:16:50 EDT.