PSTSWM SP3-200 Communication Protocol Performance

Performance Studies using

PSTSWM

IBM SP3-200 Protocol Performance

(transpose LT experiment I-C / O(log P) transpose 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: logtrans
(assuming distributed FFT)
Number of Timesteps: 12
Results:

4x16 Processors (Column Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.0046e-01   0.12   0.11   0.21 
Three Fastest
Protocols
1st2nd3rd
  a4   a5   c4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   4   25 

2x32 Processors (Column Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.5307e-01   0.08   0.10   0.12 
Three Fastest
Protocols
1st2nd3rd
  c4   c5   c1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   14 

8x8 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  5.5550e-01   0.05   0.04   0.13 
Three Fastest
Protocols
1st2nd3rd
  c4   a5   a4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   13   25 

4x16 Processors (Column Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  5.2261e-01   0.06   0.05   0.11 
Three Fastest
Protocols
1st2nd3rd
  c1   c4   a5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   13   25 

2x32 Processors (Column Major Ordering) / Problem T42L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  8.4865e-01   0.09   0.07   0.16 
Three Fastest
Protocols
1st2nd3rd
  a4   c4   d4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   4   25 

8x8 Processors (Column Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.2986e+00   0.04   0.04   0.08 
Three Fastest
Protocols
1st2nd3rd
  c5   a1   c1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   18   25 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:15:33 EDT.