Recommendation for parallelism with nested for loops?

[Christian Köstlin]

On 19.08.22 03:49, Shriramana Sharma wrote:
> Hello. I want to parallelize a computation which has two for loops, one 
> nested within another. All inner-loop-param+outer-loop-param 
> combinations can be computed independent of one another.
> 
> As I suspected, 
> [https://forum.dlang.org/post/xysyidbkjdinclmrxzgt@forum.dlang.org](this 
> forum post) says that only one loop can be parallelized. Will it be an 
> error or inefficient or useless if I try to do both?
> 
> Also, what is the best way to do parallelism in such a situation?
You could also do a custom range that makes a one-dimensional range (aka 
iota out of your nested loops) and then process this with parallel.
Another way (more similar to Ali's solution) would be to write the 
nested loops as you have them, but collect the parameters for the work 
in an array or something and then process this array in parallel.

Kind regards,
Christian