This has probably been asked before, but how difficult would it be to have
two different schedulers available as compile time options? that way they
system could be optimized for the expected load.
David Lang
On Wed, 19 Jan 2000,
Davide Libenzi wrote:
> Wednesday, January 19, 2000 5:05 PM
> James A Simmons <jsimmons@acsu.buffalo.edu> wrote :
> > I read it. It was a excellent paper. I'm amazed by just rearranging the
> > data in task_struct it reduces the time in the schedular up to 30% on
> > Pentium II. I have the patch included below. Anyone working on a
> > many-to-many model for threads for linux?
>
> Hi guys,
>
> I've seen the article made by Ray Bryant with Bill Hartner about scheduler
> performance.
> On June 1999 I posted a scheduler patch that instead do a linear scan of the
> runnable task list,
> it "slotify" tasks based on its goodness.
> With "only" 300 tasks it'll give me an 80% faster times.
> Is my thought that this patch must be included inside the scheduler since it
> gives higher performances
> with a lot of tasks and a 15 % less with 2 tasks ( at the same amount of
> switches / second ).
> The fact is that 2 tasks makes a lower switches / second than 300, therefore
> the 15% less is relative to a very lower time, so it can be quantified as
> about the same performance.
> Say that 2 tasks make 10% of switches / second relative to 300 tasks, the 2
> tasks case give a lower
> performance of about 1.5 % or less.
> Now, given the fastest performance with an increasing number of processes,
> and given that the number of
> tasks a Linux machine must handle today ( SMP, IBM S39 port , etc ... ) I
> think that this patch can be useful.
> Let me know Your thought about.
>
> Cheers,
> Davide Libenzi.
>
> --
> Debian, the freedom in freedom.
>
>
>
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