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?

I'm using 1.4.1 - is there a fix to be found in upgrading?
Unfortunately I am stuck  with the CFS as I need Linux.  Currently its Ubuntu 10.10 with

Thanks in advance