PSTSWM SP3-200 Communication Protocol Performance

Performance Studies using

PSTSWM

IBM SP3-200 Protocol Performance

(transpose LT experiment I-B2 / O(log P) transpose algorithm)

Date/Person: June 6, 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 (Row Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.9976e-01   0.12   0.11   0.45 
Three Fastest
Protocols
1st2nd3rd
  c4   a5   c5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   4   24 

2x32 Processors (Row Major Ordering) / Problem T21L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.4488e-01   0.11   0.12   0.24 
Three Fastest
Protocols
1st2nd3rd
  c4   c5   c2 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   2   14 

8x8 Processors (Row Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  5.7630e-01   0.06   0.05   0.15 
Three Fastest
Protocols
1st2nd3rd
  a5   c1   a0 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   14   25 

4x16 Processors (Row Major Ordering) / Problem T42L16
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  5.1389e-01   0.10   0.09   0.25 
Three Fastest
Protocols
1st2nd3rd
  a1   a5   a0 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   4   24 

2x32 Processors (Row Major Ordering) / Problem T42L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  8.2902e-01   0.09   0.08   0.19 
Three Fastest
Protocols
1st2nd3rd
  c1   a4   c4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   5   25 

8x8 Processors (Row Major Ordering) / Problem T85L32
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.4221e+00   0.05   0.06   0.09 
Three Fastest
Protocols
1st2nd3rd
  a4   a5   c1 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   7   25 

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