In issue #1422, user @nu11gravity ran out of memory because his system had a 10 MB default stack size and 256MB of memory, resulting in hitting a resource allocation limit in a pthread_create call since the default I/O pool size is 32.

A workaround is to use --io-threads to specify a smaller I/O pool size.

Our blocker pool threads do not need much stack space. They don't recurse, the deepest we go is when printing a backtrace when a guarantee fails.

The default stack size on the system I'm using right now is 2 MB. There's no need for use to spend 64 MB of memory on these I/O pool threads. We could set a pthread attribute to make their stacks much smaller. 128 KB would be fine, that's what our coroutine stack size is.

edit: working on this in branch sam_1425 off v1.9.x.