Re: [SHED] Questions.

From: Nick Piggin (piggin_at_cyberone.com.au)
Date: 08/31/03

  • Next message: Ian Kumlien: "Re: [SHED] Questions." 
    Date:	Sun, 31 Aug 2003 20:17:40 +1000
To: Ian Kumlien <pomac@vapor.com>

    Ian Kumlien wrote:

    >Hi,
    >
    >I'll risk sounding like a moron again =)
    >
    >I still wonder about the counter intuitive quantum value for
    >processes... (or timeslice if you will)
    >
    >Why not use small quantum values for high pri processes and long for low
    >pri since the high pri processes will preempt the low pri processes
    >anyways. And for a server working under load with only a few processes
    >(assuming they are all low pri) would lessen the context switches.
    >
    >And a system with "interactive load" as well would, as i said, preempt
    >the lower pris. But this could also cause a problem... Imho there should
    >be a "min quantum value" so that processes can't preempt a process that
    >was just scheduled (i dunno if this is implemented already though).
    >
    >Imho this would also make it easy to get the right pri for highpri
    >processes since the quantum value is smaller and if you use it all up
    >you get demoted.
    >
    >Anyways, I've been wondering about the inverted values in the scheduler
    >and for a mixed load/server load i don't see the benefit... =P
    >
    >PS. Do not forget to CC me since i'm not on this list...
    >DS.
    >

    Search for "Nick's scheduler policy" ;)

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  • Next message: Ian Kumlien: "Re: [SHED] Questions."

    Relevant Pages

    • [SHED] Questions.
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      ... > that occur in the vanilla scheduler. ... > differently but documentation is hard to find (hint Nick*). ... What i meant with priority inversion is that highpri should have small ... timeslices and low pri should have large... ...
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