Re: [RFC 00/60] Coscheduling for Linux

From: Subhra Mazumdar
Date: Thu Oct 18 2018 - 20:27:31 EST

Hi Jan,

On 9/7/18 2:39 PM, Jan H. SchÃnherr wrote:
The collective context switch from one coscheduled set of tasks to another
-- while fast -- is not atomic. If a use-case needs the absolute guarantee
that all tasks of the previous set have stopped executing before any task
of the next set starts executing, an additional hand-shake/barrier needs to
be added.

Do you know how much is the delay? i.e what is overlap time when a thread
of new group starts executing on one HT while there is still thread of
another group running on the other HT?