97 lines
5.8 KiB
HTML
97 lines
5.8 KiB
HTML
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="DC.Title" content="Performance system values: Dynamically adjust job priorities within priority bands" />
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<meta name="abstract" content="Sets job priorities within priority bands to be dynamically adjusted. (QDYNPTYSCD)" />
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<meta name="description" content="Sets job priorities within priority bands to be dynamically adjusted. (QDYNPTYSCD)" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Performance system values: Dynamically adjust job priorities within
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priority bands</title>
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</head>
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<body id="rzakzqdynptyscd"><a name="rzakzqdynptyscd"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Performance system values: Dynamically adjust job priorities within
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priority bands</h1>
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<div><p>Sets job priorities within priority bands to be dynamically adjusted.
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(QDYNPTYSCD)</p>
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<p><span class="uicontrol">Dynamically adjust job priorities within priority bands</span>,
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also known as <span class="uicontrol">QDYNPTYSCD</span>, is a member of the performance
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category of i5/OS™ system
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values. You can use this system value to set the job priorities within priority
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bands to be dynamically adjusted. To learn more, keep reading.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th colspan="2" valign="top" class="firstcol" id="d0e31">Quick reference</th>
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</tr>
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</thead>
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<tbody><tr><th valign="top" class="firstcol" id="d0e35" headers="d0e31 ">Location</th>
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<td valign="top" headers="d0e35 d0e31 ">In iSeries™ Navigator,
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select your system, <span class="menucascade"><span class="uicontrol"></span> > <span class="uicontrol">Configuration
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and Service</span> > <span class="uicontrol">System Values</span> > <span class="uicontrol">Performance</span> > <span class="uicontrol">General</span></span></td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e53" headers="d0e31 ">Special authority</th>
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<td valign="top" headers="d0e53 d0e31 ">All object (*ALLOBJ) and security administrator (*SECADM)</td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e58" headers="d0e31 ">Default value</th>
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<td valign="top" headers="d0e58 d0e31 ">Selected - dynamically adjust job priorities within priority bands
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is turned on</td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e63" headers="d0e31 ">Changes take effect</th>
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<td valign="top" headers="d0e63 d0e31 ">At the next restart of the system</td>
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</tr>
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<tr><th valign="top" class="firstcol" id="d0e68" headers="d0e31 ">Lockable</th>
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<td valign="top" headers="d0e68 d0e31 ">No</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section"><h4 class="sectiontitle">What can I do with this system value?</h4><p>This system
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value allows you to turn on (1) and turn off (0) the dynamic priority scheduler.
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The task scheduler uses this system value to determine the scheduling of jobs
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for the processor. When enabled, the dynamic priority scheduler will adjust
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job priorities within priority bands, depending on each job's use of system
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resources. This typically allows greater throughput on the system, but may
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slightly alter the priority relationship between jobs within a band. For example,
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priorities 10-16 are in Band 1, 17-22 are in Band 2, 23-35 are in Band 3,
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36-46 are in Band 4, 47-51 are in Band 5 and 52-89 are in Band 6.</p>
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<p>Regardless
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of the value assigned to this system value, any jobs that are given a priority
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of 0 through 9 are put in a high-priority band 0. This band is always checked
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first by the task dispatcher before any other dynamic priority bands are checked.
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If a job in this band becomes processor bound (by looping), the job can lock
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the system.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Where can I get more information about this system value?</h4><p>To
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learn more, go to the performance system values overview topic. If you are
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looking for a specific system value or category of system values, try using
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the i5/OS system
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value finder.</p>
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</div>
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</div>
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<div><div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzakzperformanceoverview.htm" title="Use i5/OS performance system values to view and change priority, performance adjustments, and processing values for the system.">System values: Performance overview</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="rzakzfinder.htm">System value finder</a></div>
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</div>
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</div>
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</body>
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</html>
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