There is this function: setNumThreads where “OpenCV will try to set the number of threads for the next parallel region.”
Can someone explain me this? First what “parallel region”? How can I mark a parallel region?
And second does this have anything to do with if I decided std::thread in my application? How will it impact (if any)
I read that generally this function should set it to the number of cores available. How does this impact performance?
A simple sample code would be handy too
opencv applies internal parallelization to speed up various functions, and setNumThreads() controls, how many threads to use for this (e.g. set it to 1 for debugging)
no, not at all, it’s for the internal library functions
Great Thanks! I will read the tutorial and check the sample, to see how it impacts my application.
mm I read the tutorial and the code and it is more a tutorial on the use of parallel_for_ than setNumThreads which is only mentioned once. Interesting though, I am going to practice that this weekend.
Wondering if there is any other resource for setNumThreads