It seems like we ought to have a balancer component or at least basic balancing built into init. A lack of balancing is a huge performance issue on modern SMP CPUs. How could we go about this? Could a server do the balancing through the CPU session interface?

On Tue, Mar 13, 2018 at 3:40 AM, Norman Feske <norman.feske@...1...> wrote:

Hello Ben,

On 08.03.2018 20:23, Nobody III wrote:
> On Genode, how do we ensure that CPU cores are being used efficiently?

it is not ensured.

> What mechanisms are in place for thread balancing?

None. (well, except on base-linux where Linux performs the balancing)

The general idea is that the balancing is not a concern for the base
system but should be solved at a higher level. E.g., when assigning
multiple CPUs to a VM, the guest OS will do the balancing. In a similar
way, noux could in principle spawn processes on different CPUs while
monitoring CPU usage (e.g., via core's trace service).

Cheers
Norman

--
Dr.-Ing. Norman Feske
Genode Labs

https://www.genode-labs.com · https://genode.org

Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden
Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth

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