Recommendation for parallelism with nested for loops?

[Shriramana Sharma via Digitalmars-d-learn]

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/xysyidbkjdinclmrx...@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?