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X-Authentication-Warning: slinky.cs.nyu.edu: pechtcha owned process doing -bs
Date: Tue, 30 Sep 2003 13:42:15 -0400 (EDT)
From: Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To: cygwin AT cygwin DOT com
To: cygwin AT cygwin DOT com
cc: Jason House <jhouse AT mitre DOT org>
Subject: Re: How does the windows specific aspects of nice work?
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On Tue, 30 Sep 2003, Igor Pechtchanski wrote:

> On Tue, 30 Sep 2003, Jason House wrote:
>
> > I did a search online and found the following message (but no reply to
> > it).  Does anyone know the particulars about nice?  If it still works as
> > they describe (with 2 non-normal priorities), does anyone know when it
> > will allow the full range of window supported priorities?
> >
> >      * From: "Thomas Chadwick" <j_tetazoo at hotmail dot com>
> >      * To: cygwin at cygwin dot com
> >      * Date: Mon, 06 Jan 2003 14:44:37 -0500
> >      * Subject: nice command?
> >      * Bcc:
> >
> > I got to playing around with Windows 2000 Task Manager the other day and
> > discovered that you can change the priority of a running task. This led
> > me to discover that you can specify the priority of a task when you
> > launch it by way of the windows start command using one of the following
> > options:
> >
> > LOW Start application in the IDLE priority class
> > NORMAL Start application in the NORMAL priority class
> > HIGH Start application in the HIGH priority class
> > REALTIME Start application in the REALTIME priority class
> > ABOVENORMAL Start application in the ABOVENORMAL priority class
> > BELOWNORMAL Start application in the BELOWNORMAL priority class
> > WAIT Start application and wait for it to terminate
> >
> > I then got to playing with nice (under Cygwin) to see what I could do
> > about setting the priority of a Cygwin task. I used the following syntax
> > and tried a number of values of x:
> >
> > nice -n x programname.exe
> >
> > I found that specify a value of x=0 results in NORMAL priority. For any
> > value of x > 0, I found I got a priority of LOW. For any value of x < 0,
> > I found I got a priority of HIGH.
> >
> > I tried "man nice" and "info nice" and got scant documentation. I'm just
> > curious if this is the expected behavior of nice? Is my analysis
> > correct, or are there other values of "x" that will get me the other
> > Windows priorities? FWIW, there's a Cygwin task I'd like to launch with
> > AboveNormal priority.
>
> I suspect it's a <http://cygwin.com/acronyms/#PTC> situation...  The
> implementation of the "nice()" syscall simply doesn't know about the
> AboveNormal priority value (see winsup/cygwin/syscalls.cc:2512).  There is
> a more fine-grained control mechanism in the "sched_setparam()" Cygwin API
> call, but the "nice" program doesn't use it.
>         Igor
> P.S. Another thing that's missing is a "renice" program.  Also PTC.

Oh, and this is relevant too:
<http://cygwin.com/cygwin-api/std-misc.html#AEN115>.
	Igor
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