Properly scaled underwater screen turbulence

[mankrip]

[qbism]

[mankrip]

Nice!

How's the speed in comparison to the non-threaded code?

[qbism]

With 2, 3, or 4 threads it's about the same. More than 4 threads and performance gets worse, possibly due to more overhead.

I might be doing something wrong, the tasks might be too short to make threading efficient, or there's a bottleneck, or maybe the processor is limited. My cpu is a laptop icore3 with two 'real' cores and two 'virtual' cores. With the define set to 4 threads, one of the cores runs at 75%, two others at 25%, and the last core idles. Could it be a RAM or bus bottleneck?

[mankrip]

I have no idea, I have no experience with threading.

Also, I've looked more carefully into my code, and the case numbers were actually right. What was wrong was the case 32 line, which shouldn't be there because the spancount value will always be lower than that. I've fixed the code in the first post and added a further explanation.