I've been bitten many times by the CFS scheduler while using containers and cgroups. What's the new scheduler? Has anyone here tried it in a production cluster? We're now going on two decades of wasted cores: https://people.ece.ubc.ca/sasha/papers/eurosys16-final29.pdf.
The problem here isn't the scheduler. It's resource restrictions imposed by the container but the containerized process (Go) not checking the OS features used to do that when calculating the available amount of parallelism.
