Wolfram Mathematica Documentation Center
DOCUMENTATION CENTER SEARCH
Mathematica > Systems Interfaces & Deployment > Parallel Computing > Data Parallelism >
Mathematica > Core Language > Tuning & Debugging > Parallel Computing > Data Parallelism >
Built-in Mathematica SymbolSee Also »|More About »

ParallelCombine

ParallelCombine[f, h[e1, e2, ...], comb]
evaluates f[h[e1, e2, ...]] in parallel by distributing parts of the computation to all parallel kernels and combining the partial results with comb.
ParallelCombine[f, h[e1, e2, ...]]
is equivalent to ParallelCombine[f, h[e1, e2, ...], h] if h has attribute Flat, and ParallelCombine[f, h[e1, e2, ...], Join] otherwise.
  • ParallelCombine[f, h[e1, ..., en], comb] forms expressions f[h[e1, ..., ek]], f[h[ek+1, ...]], ..., f[h[..., en]], evaluates these on all available kernels, and combines the results ri with comb[r1, r2, ...].
  • The default combiner Join is appropriate for functions f such that the result of f[h[e1, ..., ek]] has head h. This includes all functions with attribute Listable.
  • For heads h with attribute Flat the default combiner h effectively implements the associative law h[e1, ..., en] = h[h[e1, ..., ek], h[ek+1, ...], ..., h[..., en]].
  • With a compatible choice of comb, ParallelCombine[f, h[e1, e2, ...], comb] is equivalent to f[h[e1, e2, ...]].
  • If no kernels are available, ParallelCombine evaluates f[h[e1, e2, ...]] normally.
New in 7
Ask a question about this page  |  Suggest an improvement  |  Leave a message for the team