That's pretty much it -- I can increase memory, file descriptor, etc., but can I increase the number of threads?
(I've got a case where, in an error condition, my threads block [still trying to figure out why] and new ones are still being generated, until I hit a limit of 512 threads.)
can I increase the number of threads?
No [1].
That limit is very high, and if you’re hitting it then the correct path forward is to investigate why you’re hitting it, not to try to raise it.
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[1] Well, it is, as always, complex, but the 512 limit is likely to be the maximum number of work queue threads, and that’s not something you can adjust [2].
[2] Well, it is, as always, complex, because you can adjust this using the kern.wq_max_threads sysctl, but that’s a system-wide setting, not a per-process setting.