[LUGSB] batch scheduling in the kernel

[Lucas Carey]

Chip, and anyone else if they know,
>> How do you avoid starving lower-priority processes? One of the nice things
>> about the Linux scheduler (as compared to the Java scheduler, for
>> instance (at least the one from a few years ago when I read this stuff))
>> is that even low-priority processes get SOME CPU time even if the high
>> priority ones don't yeild.
>After you run for one time-slice you are moved from the active queue to
>the expired queue.  The queues don't map to the nice values, the
>scheduler will recompute the equivalent of goodness factors and move
>hogs to lower-level queues.  Processes that are friendly (i.e. go to
>sleep) end up moving to higher level queues.

I remember when the new scheduler was being talked about ~2 years ago there was talk of BATCH priority jobs. The idea that cpu-intensive unimportant processes specified as BATCH would not get scheduled unless the CPU was free, but when scheduled they'd get a larger timeslice, makeing better use of cache. I remember thinking that this sounded great for the long-running cpu-intensive jobs that we ran in my old lab. Or seti at home.
Did anything ever come of this?

-Lucas
>From markdrago at mail.com Thu Apr 15 00:55:35 2004
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From: Mark Drago <markdrago at mail.com>
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Subject: [LUGSB] Meeting Today @ 6:45 PM
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There's a LUGSB meeting this afternoon @ 6:45 PM, and is it ever going
to be fun.  I'm going to be showing off some of the stuff going on in
the Linux gaming world.  This basically amounts to playing a bunch of
games on the projector screen.  There will be live demos of WineX
playing half-life and counter-strike as well as a few other games.  Be
sure and stop by and see what all the fuss is about.

The meeting is today, April 15th @ 6:45pm in the Computer Science
building room 2129.

--Mark.