Automatic parfor without specify it

Could Matlab automatically execute all the code that could be parallelized without modifying its syntax? What I want to say is that after starting the parpool all the forloops that are in my code will be automatically executed as a parfor.

[Stephen23]

"Could Matlab automatically execute all the code that could be parallelized without modifying its syntax?"

Basically that would be normal MATLAB written using vectorized code:

https://www.mathworks.com/matlabcentral/answers/178565-can-matlab-automatically-make-my-code-parallel

https://www.mathworks.com/matlabcentral/answers/44739-does-matlab-auto-parallelize

https://www.mathworks.com/matlabcentral/answers/44409-how-effective-is-multi-core-machine-running-matlab-simulink-these-days-2012

etc.

[Andrea Stevanato]

Mmm i don't know if i understood correctly if i have this pices of code

for index = 1:size(something)
  statement;
  statement;
end

this would be parallized automatically by matlab or i need to change for with parfor? This is just an exemple, so what i would is i start parpool and then, when possible, all code will be parallized.

[Stephen23]

@Andrea Stevanato: as I wrote, my comment applies to vectorized code. If it is possible to remove the loop and write those statement to use vectorized code then MATLAB will automatically use multicores/threads when possible/suitable, depending on the operations. My comment does not apply to for loops.

Answer 1

[Rik]

No. The reason is that there are some restriction imposed on parfor-loops (mostly related to dynamic indexing), which are not imposed on normal for-loops.

Why don't you write your for-loops as parfor-loops yourself? Or do you want to run them as normal for-loops on machines without access to the parallel computing toolbox?

[Andrea Stevanato]

Exactly i want use parfor-loops only in some case and run code without parfor in other case. Or bettere I would parallelize (for, etc...) only when i start parpool "manually"

[Rik]

An ugly solution would be to have the code twice in your file: once with a for and the other time with a parfor. Then you put an if around it that checks if the parpool is started.