95 lines
5.5 KiB
HTML
95 lines
5.5 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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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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<html lang="en-us" xml:lang="en-us">
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Performance system values: Machine memory pool size" />
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<meta name="abstract" content="Specifies the size of the machine memory pool. (QMCHPOOL)" />
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<meta name="description" content="Specifies the size of the machine memory pool. (QMCHPOOL)" />
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<title>Performance system values: Machine memory pool size</title>
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</head>
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<body id="rzakzqmchpool"><a name="rzakzqmchpool"><!-- --></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: Machine memory pool size</h1>
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<div><p>Specifies the size of the machine memory pool. (QMCHPOOL)</p>
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<p><span class="uicontrol">Machine memory pool size</span>, also known as <span class="uicontrol">QMCHPOOL</span>,
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is a member of the performance category of i5/OS™ system values. You can use this system
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value to specify the size of the machine memory pool. To learn more, keep
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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">Memory Pools</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 ">None</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 ">20</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 ">Immediately</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>Specifies
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the size of the machine memory pool in megabytes (MB). A memory pool is a
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logical division of memory (storage) that is reserved for processing a job
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or group of jobs. The machine memory pool contains highly shared machine and
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operating system programs. Be careful when changing the size for this memory
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pool because system performance may be impaired if the memory pool is too
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small.</p>
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<p>The machine-enforced minimum value varies depending on the memory
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size of the machine. The system automatically increases the actual size of
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the machine memory pool to the machine-enforced minimum value if you specify
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a smaller value.</p>
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<p>If the system has increased the actual size of the
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machine memory pool, you can determine the actual machine-enforced minimum
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value for the machine disk pool (pool 1) in iSeries Navigator by doing the following:</p>
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<ol><li>Expand your iSeries server.</li>
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<li>Expand <span class="uicontrol">Work Management</span>.</li>
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<li>Expand <span class="uicontrol">Memory Pools</span>.</li>
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</ol>
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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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