157 lines
8.7 KiB
HTML
157 lines
8.7 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="My job is experiencing poor performance" />
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<meta name="abstract" content="The information in this article discusses possible reasons why a job might experience poor performance." />
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<meta name="description" content="The information in this article discusses possible reasons why a job might experience poor performance." />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<title>My job is experiencing poor performance</title>
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</head>
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<body id="rzakspoorperformance"><a name="rzakspoorperformance"><!-- --></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">My job is experiencing poor performance</h1>
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<div><p>The information in this article discusses possible reasons why
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a job might experience poor performance.</p>
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<div class="section">
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="void" border="0" rules="none"><thead align="left"><tr><th colspan="3" valign="top" id="d0e20">Insufficient memory</th>
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</tr>
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</thead>
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<tbody><tr><td rowspan="2" valign="top" width="12.5%" headers="d0e20 "> </td>
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<td valign="top" width="12.5%" headers="d0e20 ">How to diagnose:</td>
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<td valign="top" width="75%" headers="d0e20 ">View the properties of the job to determine which memory pool the job
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is running in. Then view the properties of the memory pool in iSeries™ Navigator,
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see <a href="rzakschkmemuse.htm">Check memory pool use</a>. A high
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rate of faulting in a pool indicates that there is not enough memory in the
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pool, or that too many jobs are in the pool competing for the memory.</td>
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</tr>
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<tr><td valign="top" width="12.5%" headers="d0e20 ">Recovery:</td>
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<td valign="top" width="75%" headers="d0e20 "> <ol><li>Turn on the system tuner if you are not already using it. The system value
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<a href="../rzakz/rzakzqpfradj.htm">QPFRADJ</a> automatically
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adjusts memory pools and activity levels.</li>
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<li>If possible, manually tune the pool you are working with by increasing
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the amount of memory in the pool or reducing the activity level for the memory
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pool. You might also want to check the machine pool to verify that the amount
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of memory being used is not affecting all jobs on the system.</li>
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</ol>
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</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="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="void" border="0" rules="none"><thead align="left"><tr><th colspan="3" valign="top" id="d0e57">Activity level too low</th>
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</tr>
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</thead>
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<tbody><tr><td rowspan="2" valign="top" width="12.5%" headers="d0e57 "> </td>
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<td valign="top" width="12.5%" headers="d0e57 ">How to diagnose:</td>
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<td valign="top" width="75%" headers="d0e57 ">View the properties of the job to determine its status and which memory
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pool the job is running in. If the job shows a status of <var class="varname">Waiting
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for activity level</var>, then view the properties of the memory pool
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in iSeries Navigator,
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see <a href="rzakschkmemuse.htm">Check memory pool use</a>. A high
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rate of transitions to the ineligible state in a pool indicates that too many
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jobs in the pool are competing for the memory.</td>
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</tr>
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<tr><td valign="top" width="12.5%" headers="d0e57 ">Recovery:</td>
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<td valign="top" width="75%" headers="d0e57 "> <ol><li>Turn on the system tuner if you are not already using it. The system value
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<a href="../rzakz/rzakzqpfradj.htm">QPFRADJ</a> automatically
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adjusts memory pools and activity levels.</li>
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<li>Manually tune the pool by increasing the activity level for the memory
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pool.</li>
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</ol>
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</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="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="void" border="0" rules="none"><thead align="left"><tr><th colspan="3" valign="top" id="d0e97">Insufficient CPU resource</th>
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</tr>
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</thead>
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<tbody><tr><td rowspan="2" valign="top" width="12.5%" headers="d0e97 "> </td>
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<td valign="top" width="12.5%" headers="d0e97 ">How to diagnose:</td>
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<td valign="top" width="75%" headers="d0e97 ">View the CPU % column for the job and other jobs in the Active Jobs
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list of iSeries Navigator.
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If the system is very busy, your job might not be getting enough CPU resource
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to complete its work.</td>
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</tr>
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<tr><td valign="top" width="12.5%" headers="d0e97 ">Recovery:</td>
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<td valign="top" width="75%" headers="d0e97 "> <ol><li>If possible, end or hold unnecessary work on the system.</li>
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<li>If a few jobs are CPU intensive, change the run priority of these jobs
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(a higher run priority value equals a lower run priority for the job).</li>
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</ol>
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</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="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="void" border="0" rules="none"><thead align="left"><tr><th colspan="3" valign="top" id="d0e128">Memory pool paging option</th>
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</tr>
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</thead>
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<tbody><tr><td rowspan="2" valign="top" width="12.5%" headers="d0e128 "> </td>
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<td valign="top" width="12.5%" headers="d0e128 ">How to diagnose:</td>
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<td valign="top" width="75%" headers="d0e128 ">If an application is disk intensive, if the CPU is under utilized and
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if there is sufficient memory, the use of expert cache might be beneficial.</td>
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</tr>
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<tr><td valign="top" width="12.5%" headers="d0e128 ">Recovery:</td>
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<td valign="top" width="75%" headers="d0e128 ">The expert cache can be turned on in iSeries Navigator by changing the Paging
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option for a shared memory pool to Calculated. The Paging option is located
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on the <span class="uicontrol">Configuration</span> tab of the memory pool's <span class="uicontrol">Properties</span> page
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and is only available on shared pools(not private pools).</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="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="void" border="0" rules="none"><thead align="left"><tr><th colspan="3" valign="top" id="d0e159">Low job run priority</th>
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</tr>
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</thead>
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<tbody><tr><td rowspan="2" valign="top" width="12.5%" headers="d0e159 "> </td>
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<td valign="top" width="12.5%" headers="d0e159 ">How to diagnose:</td>
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<td valign="top" width="75%" headers="d0e159 ">View the job's <a href="rzaksjobproperties.htm">properties</a> to
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determine the run priority of a job relative to other jobs on the system.</td>
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</tr>
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<tr><td valign="top" width="12.5%" headers="d0e159 ">Recovery:</td>
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<td valign="top" width="75%" headers="d0e159 ">If the job has a low run priority (higher number) relative to other
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jobs and is not using much CPU because the higher priority (lower number)
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jobs are using most of the CPU resource, you might need to increase the job's
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run priority, see <a href="rzaksjobproperties.htm">Job properties</a>.
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Also, on a system with high CPU utilization and a job with a low run priority,
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setting the Dynamically adjust job priorities within priority bands (<a href="../rzakz/rzakzqdynptyscd.htm">QDYNPTYSCD</a>) and the
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Dynamically adjust job priorities of interactive jobs (<a href="../rzakz/rzakzqdynptyadj.htm">QDYNPTYADJ</a>) system values might
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be useful.</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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<p>For more information about performance, see <a href="../rzahx/rzahx1.htm">Performance</a>. If you want more information
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about how to tune performance on your system, see <a href="../rzahx/rzahxtune.htm">Tune
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performance</a>.</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzakstroubleshoot.htm" title="Use the information in this topic to help you troubleshoot some of the most common problems that occur in work management.">Troubleshooting</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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