2002-07-29 19:01:38 +00:00
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<html lang="en">
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<title>Scheduling Server: Policy</title>
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<meta name="generator" content="BBEdit 6.1.2">
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<body>
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<h2>Scheduling Server: Policy</h2>
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2002-04-30 22:22:54 +00:00
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<p>
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2002-07-29 19:01:38 +00:00
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The scheduling server will attempt to send enough work to excede a
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hosts high water mark. If the amount of work the scheduling server is
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sending excedes four weeks, the scheduling server will not attach more
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work to a scheduler reply. This does not prevent the scheduling server
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from sending a work unit that takes more than four weeks, but merely
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from attaching more work after a scheduler reply has four weeks of work.
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If a work unit uses more disk resources than a host has available, the
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scheduling server will not attach that work unit. The scheduling server
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estimates the amount of time a work unit will take to complete with the
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formula <b>(number of fpops)/(fpops per second)+(number of iops)/(iops
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per second)</b>. The number of fpops and number of iops are provided by
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the backend when creating the work unit, and the calculation speeds are
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included in a scheduler request. If no work is available, the scheduling
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server sends the message <tt>no work available</tt> with priority
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<tt>low</tt>, and requests that the client wait before sending another
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scheduler request.
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</p>
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</body>
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</html>
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