Crystal parallelism and Kemal

[rogerdpack]

In my benchmarks once you get past like 4 simultaneous workers then it starts to bottleneck on the GC, FWIW…

Multithreaded Crystal initial thoughts

OK here’s some patches I found to speed it up a little but overall…couldn’t see much, except that past like 4-6 threads it seems to get all choked up on global locks allocs and realloc’s…dang… (you can see by running gdb against it: gdb -ex “set pagination 0” -ex “thread apply all bt” -batch -p or using some other profiler.) At the same time it did get to like 10% idle cpu on a box with 8 cores I was using for it. Maybe that’s good? Guess there’s multi process if you need to use 100% …