See also <a href="http://embedded.eecs.berkeley.edu/dopsysadmin/faq/86.html">Server Crash: Not enough space: fork: Unable to fork new process</a>.

Andrews crashed with:

<pre>
server reached MaxClients setting, consider raising the MaxClients setting
</pre>

<p>As of 1/11, bennett had
<code>/usr/local/apache/conf/extra/httpd-mpm.conf</code>:
<pre>
&lt;IfModule mpm_prefork_module&gt;
    StartServers          5
    MinSpareServers       5
    MaxSpareServers      10
    # 04/10 Added ServerLimit to 325
    ServerLimit          325
    # Ptolemy_Localization changed from 150 to 325 
    MaxClients          325
    # Ptolemy_Localization changed from 0 to 10000
    MaxRequestsPerChild   10000
&lt;/IfModule&gt;
</pre>

<pre>

</pre>
<a href="http://httpd.apache.org/docs/2.2/mod/mpm_common.html#maxclients"><code>http://httpd.apache.org/docs/2.2/mod/mpm_common.html#maxclients</code></a> says:
<blockquote>
For non-threaded servers (i.e., prefork), MaxClients translates into the maximum number of child processes that will be launched to serve requests. The default value is 256; to increase it, you must also raise ServerLimit.
</blockquote>
</p>

<p>The server on andrews is using prefork, we can tell
by running <code>apachectl -l</code>, which lists
<code>prefork.c</code>.  Also, looking at the
<code>./configure</code> output in <code>/export/home1/root/tools/httpd-2.2.17/config.status</code>
indicates that we are using prefork.</p>

<p>So, this fix is to update 
<code>/usr/local/apache/conf/extra/httpd-mpm.conf</code>
on andrews to
<pre>
&lt;IfModule mpm_prefork_module&gt;
    StartServers          5
    MinSpareServers       5
    MaxSpareServers      10
    # Ptolemy: ServerLimit needs to be set if MaxClients is > 256            
    ServerLimit         325
    # Ptolemy: changed MaxClients from 150 to 325 1/11/11 cxh                
    MaxClients          325
    # Ptolemy: changed MaxRequestsPerChild from 0-10000 12/6/09 cxh          
    #MaxRequestsPerChild   0
    MaxRequestsPerChild   10000
&lt;/IfModule&gt;
</pre>
and then restart Apache with
<pre>
/etc/init.d/gsrc stop
/etc/init.d/gsrc start
</pre>