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Maui Scheduler
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<h1>5.4 Node Availability Policies</h1>
<p>Schedulers will allow jobs to be launched on a given compute node as long as the node is not full or <i>busy</i>. The parameter <b><a href="a.fparameters.html#nodeavailabilitypolicy">NODEAVAILABILITYPOLICY</a></b> allows a site to determine what criteria constitutes a node being busy . The legal settings are listed in the table below:</p>
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<td valign="top"><b>Availability Policy</b><br></td>
<td valign="top"><b>Description</b><br></td>
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<td valign="top"><b>DEDICATED</b><br></td>
<td valign="top">The node is considered busy if dedicated resources equal or exceed configured resources<br></td>
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<td valign="top"><b>UTILIZED</b><br></td>
<td valign="top">The node is considered busy if utilized resources equal or exceed configured resources<br></td>
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<td valign="top"><b>COMBINED</b><br></td>
<td valign="top">The node is considered busy if either dedicated or utilized resources equal or exceed configured resources<br></td>
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<p>The default setting for all nodes is <b>COMBINED</b> indicating that a node can accept workload so long as the jobs which the node was allocated to do not request or utilize more resources than the node has available. In a load balancing environment, this may not be the desired behavior. Setting the <b>NODEAVAILABILITYPOLICY</b> parameter to <b>UTILIZED</b> will allow jobs to be packed onto a node even if the aggregate resources requested exceeds the resources configured. For example, assume a scenario with a 4 processor compute node and 8 jobs requesting 1 processor each. If the resource availability policy was set to <b>COMBINED</b> , this node would only allow 4 jobs to start on this node even if the jobs induced a load of less than 1.0 each. With the resource availability policy set to <b>UTILIZED</b>, the scheduler would continue to allow jobs to be started on the node until the node's load average exceeded a per processor load value of 1.0 (in this case, a total load of 4.0). To prevent a node from being over populated within a single scheduling iteration, Maui will artificially raise the node's load for one scheduling iteration when starting a new job. On subsequent iterations, the actual measured node load information will be used.</p>
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