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5.1.4prioritystrategies.html
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<h1>5.1.4 Prioritization Strategies</h1>
<p>Each component or subcomponent may be used to accomplish different objectives. <b>WALLTIME</b> can be used to favor (or disfavor) jobs based on their duration. Likewise, <b>ACCOUNT</b> can be used to favor jobs associated with a particular project while <b>QUEUETIME</b> can be used to favor those jobs which have been waiting the longest.</p>
<p><b>- <a href="5.1.2priorityfactors.html#queuetimesubcomponent">Queue Time</a></b><br>
<b>- <a href="5.1.2priorityfactors.html#xfactorsub">Expansion Factor</a></b><br>
<b>- <a href="5.1.2priorityfactors.html#resourcecomponent">Resource</a></b><br>
<b>- <a href="5.1.2priorityfactors.html#fairshare">Fairshare</a></b><br>
<b>- <a href="5.1.2priorityfactors.html#cred">Cred</a></b><br>
<b>- <a href="5.1.2priorityfactors.html#target">Target Metrics</a></b></p>
<p>Each priority factor group may contain one or more subfactors. For example, the Resource factor consists of Node, Processor, Memory, Swap, Disk, and PE components. Figure <X> shows the current priority breakdown. From the figure, it is quickly apparent that the prioritization problem is fairly 'nasty' due to the fact that every site needs to prioritize a bit differently. Fortunately, there has not yet been a site that has desired to use more than a fraction of these priority factors, thus greatly simplifying the job priority tuning issue. When calculating a priority, the various priority factors are summed and then bounded between 0 and MAX_PRIO_VAL which is currently defined as 100000000 (one billion).</p>
<p>Each priority factor is reviewed in detail below. The command '<a href="commands/diagnosepriority.html">diagnose -p</a>' is designed to assist in visualizing the priority distribution resulting from the current job priority configuration. Also, the <a href="commands/showgrid.html">showgrid</a> command will help indicate the impact of the current priority settings on scheduler service distributions.</p>
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