I recall a discussion some time ago about yield, the Completely F%’d Scheduler (CFS) and OpenMPI.

My system is currently suffering from massive CPU use while busy waiting.  This gets worse as I try to bump up user concurrency.

I am running with yield_when_idle but its not enough. Is there anything else I can do to release some CPU resource?
I recall seeing one post where usleep(1) was inserted around the yields, is this still feasible?