Merge r1657854, r1657856 from trunk:

PR57094: Provide some hints about Windows problems
with more than a few dozen piped loggers.

Submitted by: Edward Lu

add a generic tuning section and linked to the piped logger
issue in logs.html

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1657858 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/docs/manual/logs.xml b/docs/manual/logs.xml
index be03279aabd346ec2cacae1667c2bd6243976f2c..da135778b37ed00f112a7e8d8c16117330667a31 100644 (file)
--- a/docs/manual/logs.xml
+++ b/docs/manual/logs.xml
@@ -594,10 +594,6 @@ LogFormat "%!200,304,302{Referer}i" refererlog
     for the access log, the same technique can be used for the
     error log.</p>
 
-    <p>A similar but much more flexible log rotation program
-    called <a href="http://www.cronolog.org/">cronolog</a>
-    is available at an external site.</p>
-
     <p>As with conditional logging, piped logs are a very powerful
     tool, but they should not be used where a simpler solution like
     off-line post-processing is available.</p>
@@ -618,6 +614,18 @@ CustomLog "|$/usr/local/apache/bin/rotatelogs   /var/log/access_log 86400" commo
     For compatibility reasons with Apache 2.2 the notation
     "<code>||</code>" is also supported and equivalent to using
     "<code>|</code>".</p>
+
+    <note><title>Windows note</title>
+    <p>Note that on Windows, you may run into problems when running many piped
+    logger processes, especially when HTTPD is running as a service. This is
+    caused by running out of desktop heap space. The desktop heap space given
+    to each service is specified by the third argument to the
+    <code>SharedSection</code> parameter in the
+    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\SessionManager\SubSystems\Windows
+    registry value. <strong>Change this value with care</strong>; the normal
+    caveats for changing the Windows registry apply, but you might also exhaust
+    the desktop heap pool if the number is adjusted too high.</p>
+    </note>
   </section>
 
   <section id="virtualhost">

diff --git a/docs/manual/platform/windows.xml b/docs/manual/platform/windows.xml
index 9e2de1b56246c4164aceaf489d864199e60cead8..352465f6a0bfd9ce7ed389b5b29c6cee14940c53 100644 (file)
--- a/docs/manual/platform/windows.xml
+++ b/docs/manual/platform/windows.xml
@@ -628,4 +628,13 @@ Alias /images/ //imagehost/www/images/
   above.</p>
   </section>
 
+  <section id="tuning">
+    <title>Windows Tuning</title>
+    <ul>
+      <li><p>If more than a few dozen piped loggers are used on an operating system 
+      instance is necesar, scaling up the "desktop heap" is often necessary. For
+      more detailed information, refer to the <a href="../logs.html#piped"
+      >piped logging</a> documntation.</p></li>
+    </ul>
+  </section>
 </manualpage>