On Mon, Oct 30, 2017 at 11:30:59AM -0500, Christopher Lameter wrote: > Historically cpusets were not used for cpu isolation. They were used to > restrict applications threads to sets of cpus for performance reasons. And > we are here dealing with individual processors.
The HPC workloads very much disabled load-balancing across most CPUs. If you disable "sched_load_balance" the thing creates NULL sched_domains, the exact thing isolcpus ends up doing. This is something cpusets have done for a _long_ time, if not from the very start. Yes, you can also create smaller sched_domains which is useful for other cases and you can even mix the lot, by creating a small set of load-balanced CPUs for the system tasks while giving a bunch of unbalanced CPUs to your application.
