Re: [Caml-list] Thread and kernel 2.6 pb still there in CVS

[Damien Doligez <damien.doligez@inria.fr>]

On Jul 10, 2004, at 01:21, Donald Wakefield wrote:

> I know this comes a bit late in this 'thread', but there's been
> discussion on Slashdot on a new scheduler framework called Bossa. I
> posted a quote from Xavier's discussion of sched_yield, and another
> poster replied. In brief:

I read that post and I don't think it makes any sense at all.

> "...OpenOffice.org and Ocaml have to wait too long for their next CPU
> quantum, but that's because they are CPU bound tasks and it's their
> own fault.

In other words, a CPU-bound task should not expect to get CPU time.
Duh.

> "The bug was in past versions of Linux where, although it was
> pre-emptive, sched_yield was allowed some power - it should have been
> ignored in user-space and the scheduler decided what gets CPU and
> when. Depending on that bug is also a bug and the mis-users deserve
> everything they get."

This implies that the new scheduler is just as buggy as the old one,
since it doesn't ignore sched_yield either.

The real problem, IMO, is that there are two "yield" primitives
needed: one for yielding to another thread, and one for yielding
to another process.  They (basically) changed sched_yield from
one to the other, but the right solution would be to provide both.

-- Damien

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