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Re: compile directly into a .zip/.jar file?

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On 4/16/2014 3:33 PM, Martin Gregorie wrote:
> On Wed, 16 Apr 2014 12:45:54 -0400, Jeff Higgins wrote:
>
>> On 04/16/2014 10:58 AM, Jeff Higgins wrote:
>>
>>> as an adjunct to the manpages
>> Schedule this. A memento for me.
>> Kernel Korner - I/O Schedulers - Robert Love
>> <http://www.linuxjournal.com/article/6931>
>
> Hate to say this, but I was using a a box with a scheduler that was at
> least as good as the Anticipatory Scheduler way back in 1972 on an ICL
> 1903S mainframe running the George 3 Mk 6 OS.
>
> George 3 used a similar directory structure to Unix/Linux. Its i/o
> scheduler was, however, quite a bit different. This maintained two i/o
> queues and a vector for each disk. The vector kept book on where the
> heads were and which direction they were travelling. One of the queues
> held requests for blocks that were 'in front' of the heads and the other
> queue held requests for blocks 'behind' the heads. Both queues were
> sorted. When the 'in front' queue was empty, the queues were swapped and
> the vector reversed, so in practise the heads floated smoothly back and
> forth across the disk while sounding like castenet dancer on speed and
> the i/o rate was much higher than earlier versions, without the i/o
> scheduler, or the manual UDAS executive could manage.
> [...]

     An issue (not necessarily "problem") with this approach is that
the tracks near the inner and outer extremes get fewer/slower accesses
than those near the middle.[*]  That could be turned to advantage,
by allocating frequently-used files in the favored area and relegating
less-used material to the frozen fringes -- but then you're sort of
back in the days of fixed (usually manual) allocations.

     [*] I once heard an instructor explain it this way: He asked us
to think of three friends sitting on a bench, passing a can of beer
back and forth.  Friend A on one end takes a swig and hands the can
to B in the middle, who takes a swig and hands it on to C on the
other end, who takes his swig and hands the can -- to whom?  To his
only neighbor, B.  The swigging sequence is ABCBABCBAB... with B
getting half the beer while A and C split the rest.

-- 
Eric Sosman
esosman@comcast-dot-net.invalid

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compile directly into a .zip/.jar file? Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-04-12 12:30 +0000
  Re: compile directly into a .zip/.jar file? Joerg Meier <joergmmeier@arcor.de> - 2014-04-12 15:02 +0200
    Re: compile directly into a .zip/.jar file? Roedy Green <see_website@mindprod.com.invalid> - 2014-04-12 19:56 -0700
      Re: compile directly into a .zip/.jar file? Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-04-13 15:29 +0000
    Re: compile directly into a .zip/.jar file? Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-04-13 15:19 +0000
      Re: compile directly into a .zip/.jar file? Roedy Green <see_website@mindprod.com.invalid> - 2014-04-13 17:35 -0700
    Re: compile directly into a .zip/.jar file? Arne Vajhøj <arne@vajhoej.dk> - 2014-04-13 13:53 -0400
      Re: compile directly into a .zip/.jar file? Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-04-13 22:21 +0000
        Re: compile directly into a .zip/.jar file? Arne Vajhøj <arne@vajhoej.dk> - 2014-04-13 18:40 -0400
    Re: compile directly into a .zip/.jar file? Arne Vajhøj <arne@vajhoej.dk> - 2014-04-13 14:04 -0400
      Re: compile directly into a .zip/.jar file? Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-04-13 22:52 +0000
        Re: compile directly into a .zip/.jar file? Arne Vajhøj <arne@vajhoej.dk> - 2014-04-14 21:41 -0400
          Re: compile directly into a .zip/.jar file? Martin Gregorie <martin@address-in-sig.invalid> - 2014-04-15 12:51 +0000
            Re: compile directly into a .zip/.jar file? Arne Vajhøj <arne@vajhoej.dk> - 2014-04-15 20:00 -0400
              Re: compile directly into a .zip/.jar file? Martin Gregorie <martin@address-in-sig.invalid> - 2014-04-16 12:29 +0000
                Re: compile directly into a .zip/.jar file? Jeff Higgins <jeff@invalid.invalid> - 2014-04-16 10:58 -0400
                Re: compile directly into a .zip/.jar file? Jeff Higgins <jeff@invalid.invalid> - 2014-04-16 12:45 -0400
                Re: compile directly into a .zip/.jar file? Martin Gregorie <martin@address-in-sig.invalid> - 2014-04-16 19:33 +0000
                Re: compile directly into a .zip/.jar file? Jeff Higgins <jeff@invalid.invalid> - 2014-04-16 15:48 -0400
                Re: compile directly into a .zip/.jar file? Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-04-16 16:20 -0400
                Re: compile directly into a .zip/.jar file? Martin Gregorie <martin@address-in-sig.invalid> - 2014-04-16 22:31 +0000
                Re: compile directly into a .zip/.jar file? Martin Gregorie <martin@address-in-sig.invalid> - 2014-04-16 18:43 +0000
                Re: compile directly into a .zip/.jar file? Arne Vajhøj <arne@vajhoej.dk> - 2014-04-16 18:33 -0400
                Re: compile directly into a .zip/.jar file? Martin Gregorie <martin@address-in-sig.invalid> - 2014-04-17 12:58 +0000
  Re: compile directly into a .zip/.jar file? Roedy Green <see_website@mindprod.com.invalid> - 2014-04-12 19:54 -0700
    Re: compile directly into a .zip/.jar file? Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-04-13 16:08 +0000
  Re: compile directly into a .zip/.jar file? Martin Gregorie <martin@address-in-sig.invalid> - 2014-04-13 23:25 +0000
    Re: compile directly into a .zip/.jar file? Arne Vajhøj <arne@vajhoej.dk> - 2014-04-14 21:40 -0400
      Re: compile directly into a .zip/.jar file? Martin Gregorie <martin@address-in-sig.invalid> - 2014-04-15 13:38 +0000
        Re: compile directly into a .zip/.jar file? Arne Vajhøj <arne@vajhoej.dk> - 2014-04-15 19:49 -0400
          Re: compile directly into a .zip/.jar file? Martin Gregorie <martin@address-in-sig.invalid> - 2014-04-16 12:38 +0000
  Re: compile directly into a .zip/.jar file? Roedy Green <see_website@mindprod.com.invalid> - 2014-04-13 17:38 -0700

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