Re: question about contest benchmark

[Lee Revell <rlrevell@joe-job.com>]

On Tue, 2005-05-03 at 16:09 -0400, Valdis.Kletnieks@vt.edu wrote:
> On Tue, 03 May 2005 14:29:59 EDT, Lee Revell said:
> 
> > But, it seems to me that even if an interactive process briefly goes CPU
> > bound (due to bloat, bugs, or intent), it should still be scheduled
> > preferentially to a pure CPU bound process like a build.
> 
> So you want it to schedule that big image (Evolution) that's already used 5
> minutes of CPU since it started (this morning, admittedly) in preference to
> that cc1 process that will be gone before it's used 2 seconds of CPU, plus all
> the disk I/O that cc1 performs (hopefully the cache will help here, but it may
> indeed go to disk to read the source files)?
> 

Yes.  Almost no one will notice whether that build took 2 or 4 seconds.
But a few seconds is an eternity when you are staring at a blank pane,
waiting for it to render the message list.  And I found that when
waiting for the message list to render, backgrounding the build causes
it to render in a second or two, while if I just wait for it it might
take 20 seconds.  This implies that the scheduler could do the same
thing.

Anyway, this was not a great example, as the problem turned out to be an
application bug.  If I can find a non-pathological case that
demonstrates a scheduler problem, I'll post it.

Lee

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/