>> --- httpd/httpd/trunk/docs/manual/mpm.html.en (original) >> +++ httpd/httpd/trunk/docs/manual/mpm.html.en Sun Oct 7 22:59:14 2012 >> @@ -99,6 +99,28 @@ choice at compile-time.</p> >> <code class="module"><a href="./mod/event.html">event</a></code>, >> depending on platform capabilities</td></tr> >> <tr class="odd"><td>Windows</td><td><code class="module"><a >> href="./mod/mpm_winnt.html">mpm_winnt</a></code></td></tr> >> </table> >> + >> +<div class="note"><p>Here, 'Unix' is used to mean Unix-like operating >> systems, such as >> +Linux, BSD, Solaris, Mac OS X, etc.</p></div> >> + >> +<p>In the case of Unix, the decision as to which MPM is installed is >> +based on two questions:</p> >> +<p>1. Does the system support <a >> href="http://en.wikipedia.org/wiki/Threads_(computer_science)">threads</a>?</p> >> +<p>2. Does the system support <a href="http://en.wikipSo, >> edia.org/wiki/Polling_(computer_science)">polling</a>?</p> >> + >> +<p>If the answer to both questions is 'yes', the default MPM is >> +<code class="module"><a href="./mod/event.html">event</a></code>.</p> > > It isn't that simple. > > APR_POLLSET_THREADSAFE has to be supported, and that is more than the > well-known capabilities of threads and polling. > > APR_POLLSET_THREADSAFE means that the platform has an advanced polling > mechanism which allows pollsets to be manipulated in a certain way, > and that APR has an implementation that uses that mechanism. > > Linux, Solaris, and FreeBSD/Mac OS X are platforms that satisify both > characteristics. z/OS is a platform that has an advanced polling > mechanism but without an APR implementation in the stable branches. > Neither AIX nor HP-UX have APR implementations, though I'd guess that > the OS has the feature and nobody has gotten around to exploiting it > in APR.
So, how about: ====================================== In the case of Unix, the decision as to which MPM is installed by default is based on two questions: 1. Does the system support threading? 2. Does the system support APR_POLLSET_THREADSAFE? Linux, Solaris, FreeBSD and Mac OS X are platforms that satisfy both characteristics. If the answer to both questions is 'yes', the default MPM is event. If The answer to #1 is 'yes', but the answer to #2 is 'no', the default will be worker. If the answer to both questions is 'no', then the default MPM will be prefork. (strike last sentence) ========================================= Or, is it better to leave off the details entirely? I thought it would be good to give folks an idea of what the default are. For most people, the default will presumably be event ... except when it's not. Right? -- Rich Bowen rbo...@rcbowen.com :: @rbowen rbo...@apache.org
