PSTSWM SP3-200 Algorithm Comparison

Performance Studies using

PSTSWM

IBM SP3-200 Algorithm Comparison

(transpose FFT experiment A1 )

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
Number of Timesteps: 12
Results:

Transpose FFT (mpi)
Algorithm Comparison
  T10L16    T10L16    T21L8     T21L32    T21L16    T42L16 
  P=32     P=16     P=8     P=32     P=16     P=8  
  optimal algorithm   srtrans  srtrans  swtrans  swtrans  srtrans  srtrans 
  (alltoallv-min)/min     0.007    0.004    0.289    0.041    0.048    0.085 
  (generic-min)/min     0.223    0.221    0.270    0.412    0.373    0.051 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:17:15 EDT.