PSTSWM SP3-200 Algorithm Comparison

Performance Studies using

PSTSWM

IBM SP3-200 Algorithm Comparison

(transpose FFT experiment A3 )

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
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   alltoallv  swtrans  srtrans  swtrans  srtrans  srtrans 
  (alltoallv-min)/min     0.000    0.022    0.161    0.013    0.047    0.050 
  (generic-min)/min     0.252    0.223    0.240    0.334    0.305    0.012 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:16:28 EDT.