no speed improvement using 'parfor'

Hi

i'm using parfor in one of my loops to speed up the process but Matlab only uses 1 cpu, thus it has the same operating speed as without parfor (and i have 4 cpus). How come ?

thanks

Jeff

Answer 1

[Jean-François]

i'm on 2013a

i think it's because i don't have the parallel computing toolbox (yet) right? i thought parfor was working because i hadn't any error messages when using it...

Jeff

[Sean de Wolski]

parfor will run on a system without PCT. This is so a user can develop parallel code and have it not break when they give it to someone without PCT.

Answer 2

[Sean de Wolski]

What release are you using? If you are using a release before R2013b, did you start a matlabpool?

matlabpool open  %open workers for parfor

If you're on R2013b, the parpool should start automatically unless you turn this off in preferences.