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Diffstat (limited to 'docs/manual/mod/mpm_common.html.en')
| -rw-r--r-- | docs/manual/mod/mpm_common.html.en | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/docs/manual/mod/mpm_common.html.en b/docs/manual/mod/mpm_common.html.en index 7730cc8d..a92386d6 100644 --- a/docs/manual/mod/mpm_common.html.en +++ b/docs/manual/mod/mpm_common.html.en @@ -60,7 +60,9 @@ more than one multi-processing module (MPM)</td></tr> <li><img alt="" src="../images/down.gif" /> <a href="#threadsperchild">ThreadsPerChild</a></li> <li><img alt="" src="../images/down.gif" /> <a href="#threadstacksize">ThreadStackSize</a></li> </ul> -<ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div> +<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mpm_common">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mpm_common">Report a bug</a></li></ul><h3>See also</h3> +<ul class="seealso"> +<li><a href="#comments_section">Comments</a></li></ul></div> <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> <div class="directive-section"><h2><a name="CoreDumpDirectory" id="CoreDumpDirectory">CoreDumpDirectory</a> <a name="coredumpdirectory" id="coredumpdirectory">Directive</a></h2> @@ -277,6 +279,13 @@ in *BSDs.</td></tr> then make each child handle a single bucket (with round-robin distribution of the buckets at children creation time).</p> + <div class="note"><h3>Meaning of "online" CPU core</h3> + <p>On Linux (and also BSD) a CPU core can be turned on/off if + <a href="https://www.kernel.org/doc/Documentation/cpu-hotplug.txt">Hotplug</a> + is configured, therefore <code class="directive">ListenCoresBucketsRatio</code> needs to + take this parameter into account while calculating the number of buckets to create.</p> + </div> + <p><code class="directive">ListenCoresBucketsRatio</code> can improve the scalability when accepting new connections is/becomes the bottleneck. On systems with a large number of CPU cores, enabling this feature has @@ -286,7 +295,10 @@ in *BSDs.</td></tr> <p>There must be at least twice the number of CPU cores than the configured <var>ratio</var> for this to be active. The recommended <var>ratio</var> is <code>8</code>, hence at least <code>16</code> - cores should be available at runtime when this value is used.</p> + cores should be available at runtime when this value is used. + The right <var>ratio</var> to obtain maximum performance needs to be calculated + for each target system, testing multiple values and observing the variations in your + key performance metrics.</p> </div> <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> |