[marcus0x62]

I did some non-scientific testing with this last week and, at least for my problem (brute-forcing RC4 keys with relatively small numbers of long-lives threads,) threads and go routines were approximately equal in terms of performance with goroutines very slightly faster (around 5% or so.)

I have another test I'm running with the same workload, but with more dynamically created threads (n keys dispatched to a pool of threads/goroutines until the key space is exhausted) but I haven't finished the threaded version for comparison yet.

[gpderetta]

Wouldn't you have exactly 1 thread per CPU for this sort of brute force embarrassingly parallel, CPU intensive computation? You should be context switch approximately never which makes coroutine vs thread moot.

[marcus0x62]

The point was more to see what the overhead is for CPU-bound tasks that do need to switch, not that this is the best approach for this particular task. I just happened to have the threaded version available, so I thought it made a good point of comparison.