Messages in this thread | | | From | "Mike Galbraith" <> | Subject | Re: 2.5.47 scheduler problems? | Date | Mon, 18 Nov 2002 11:52:58 +0100 |
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----- Original Message ----- From: "Tim Connors" <tconnors@astro.swin.edu.au> To: "Mike Galbraith" <EFAULT@gmx.de> Cc: <linux-kernel@vger.kernel.org> Sent: Monday, November 18, 2002 8:53 AM Subject: Re: 2.5.47 scheduler problems?
> On Mon, 18 Nov 2002, Mike Galbraith wrote: > > > > > If I do the same in 2.5.47, I have no control of my box. Setting > > all tasks > > > > to SCHED_FIFO or SCHED_RR prior to starting make -j10 bzImage, I can > > regain > > > > control, but interactivity under load is basically not present. > > > > > > Funny that. > > > > > > > I used to be able to wave a window poorly at make -j25 (swapping > > heftily), > > > > fairly smoothly at make -j20, and smoothly at make -j15 or below. > > This > > > > with no SCHED_RR/SCHED_FIFO. (I haven't done much testing like this > > in > > > > quite a while though) > > > > > > Perhaps you should consider buying an extra 29 CPU's for you desktop? > > > > I have neither the need for 30 CPUs, nor the cash to pay for such a > > beast :) > > > > I gather you think my test is silly? > > Well, yes, 30 processes at a time on a single CPU does seem a bit silly - > given that (under the old system), you would not expect X to get more than > 3% of the CPU time.
I don't try -j30 with X/KDE running.. that's much too heavy for my little box. The whole point of doing -j30 on my box without X/KDE is that it juuuust fills up capacity. It generally adds a minute to build time despite quite hefty swapping. With aa kernels or heavily twiddled stock kernels, it's more like 30 seconds. (with new gcc, -j30 is way too much too.. oink oink;)
> Also sceduling normal processes (ie, not real-time processes) as RR/FIFO > seemed also pretty bad.
That was only to see if I _could_ get some CPU, and with (only:) 10 copies of gcc running.
> > However.... > > But I have to now admit that I haven't yet played with 2.5.47 seriously, > and wansn't aware of the problems which Andrew just posted. > > mea culpa. > > > -- > TimC -- http://astronomy.swin.edu.au/staff/tconnors/
-Mike
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