Re: cellfun vs. parcellfun: speed

[Martin Helm]

You create way to many jobs, it is not effective to create 100000 jobs
on a 4 core machine (or whatever you have):

tic ; parcellfun (4, @isempty, cell(1,100000)) ; toc
parcellfun: 100000/100000 jobs done
Elapsed time is 30.6851 seconds.


tic ; parcellfun (4, @isempty, cell(1,100000), "ChunksPerProc", 1) ; toc
parcellfun: 4/4 jobs done
Elapsed time is 0.0850289 seconds.

tic ; parcellfun (2, @isempty, cell(1,100000), "ChunksPerProc", 1) ; toc
parcellfun: 2/2 jobs done
Elapsed time is 0.0729971 seconds.

tic ; cellfun (@isempty, cell(1,100000)) ; toc
Elapsed time is 0.10386 seconds.

so you see even with that trivial example I get a little bit speedup
compared to cellfun, when limiting the number of jobs to something
reasonable (i3 notebook dual core with hyperthreading)