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      of the main server:</p>

      <div class="example"><h3>Global config</h3><p><code>
        NumServers 7<br />
        ChildPerUserID user1 group1 2<br />
        ChildPerUserID user2 group2 4
      </code></p></div>

      <p>Using unbalanced numbers of processes as above is useful, if the
      particular virtual hosts produce different load. The assignment to
      the virtual hosts is easily done as in the example below. In
      conclusion with the example above the following assumes, that
      <code>server2</code> has to serve about twice of the hits of
      <code>server1</code>.</p>

      <div class="example"><h3>Example</h3><p><code>
        NameVirtualHost *<br />
        <br />
        &lt;VirtualHost *&gt;<br />
        <span class="indent">
          ServerName fallbackhost<br />
          # no assignment; use fallback<br />
        </span>
        &lt;/VirtualHost&gt;<br />
        <br />
        &lt;VirtualHost *&gt;<br />
        <span class="indent">
          ServerName server1<br />
          AssignUserID user1 group1<br />
        </span>
        &lt;/VirtualHost&gt;<br />
        <br />
        &lt;VirtualHost *&gt;<br />
        <span class="indent">
          ServerName server2<br />
          AssignUserID user2 group2<br />
        </span>
        &lt;/VirtualHost&gt;
      </code></p></div>
    
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="AssignUserID" id="AssignUserID">AssignUserID</a> <a name="assignuserid" id="assignuserid">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Tie a virtual host to a user and group ID</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AssignUserID <var>user-id</var> <var>group-id</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>MPM</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>perchild</td></tr>
</table>
    <p>Tie a virtual host to a specific user/group combination. Requests
    addressed to the virtual host where this directive appears will be
    served by a process running with the specified user and group ID.</p>

    <p>The user and group ID has to be assigned to a number of children
    in the global server config using the <code class="directive"><a href="#childperuserid">ChildPerUserID</a></code> directive. See the section above for a
    <a href="#user-ids">configuration example</a>.</p>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="ChildPerUserID" id="ChildPerUserID">ChildPerUserID</a> <a name="childperuserid" id="childperuserid">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Specify user ID and group ID for a number of child
processes</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ChildPerUserID <var>user-id</var> <var>group-id</var>
<var>num-children</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>MPM</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>perchild</td></tr>
</table>
    <p>Specify a user ID and group ID for a number of child processes.
    The third argument, <var>num-children</var>, is the number of child
    processes to start with the specified user and group. It does
    <em>not</em> represent a specific child number. In order to use this
    directive, the server must be run initially as <code>root</code>.
    If you start the server as a non-root user, it will fail to change
    to the lesser privileged user.</p>

    <p>If the total number of child processes, found by totaling all of the
    third arguments to all <code class="directive">ChildPerUserID</code> directives
    in the config file, is less than <code class="directive"><a href="#numservers">NumServers</a></code>, then all remaining children will inherit the
    <code class="directive"><a href="../mod/mpm_common.html#user">User</a></code> and <code class="directive"><a href="../mod/mpm_common.html#group">Group</a></code> settings from the main server.
    See the section above for a <a href="#user-ids">configuration
    example</a>.</p>

    <div class="warning"><h3>Security</h3>
      <p>Don't set <var>user-id</var> (or <var>group-id</var>) to
      <code>root</code> unless you know exactly what you are doing, and
      what the dangers are.</p>
    </div>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="MaxThreadsPerChild" id="MaxThreadsPerChild">MaxThreadsPerChild</a> <a name="maxthreadsperchild" id="maxthreadsperchild">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum number of threads per child process</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>MaxThreadsPerChild <var>number</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>MaxThreadsPerChild 64</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>MPM</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>perchild</td></tr>
</table>
    <p>This directive sets the maximum number of threads that will be
    created in each child process. To increase this value beyond its
    default, it is necessary to change the value of the <code class="directive"><a href="../mod/mpm_common.html#threadlimit">ThreadLimit</a></code> directive and stop and
    re-start the server.</p>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="NumServers" id="NumServers">NumServers</a> <a name="numservers" id="numservers">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Total number of children alive at the same time</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>NumServers <var>number</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>NumServers 2</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>MPM</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>perchild</td></tr>
</table>
    <p>The <code class="directive">NumServers</code> directive determines the number
    of children alive at the same time. This number should be large enough to
    handle the requests for the entire site. To increase this value beyond the
    value of <code>8</code>, it is necessary to change the value of the
    <code class="directive"><a href="../mod/mpm_common.html#serverlimit">ServerLimit</a></code> directive and stop
    and re-start the server. See the section above for a <a href="#user-ids">configuration example</a>.</p>

</div>
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