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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@87505 13f79535-47bb-0310-9956-ffa450edef68
77 lines
2.3 KiB
HTML
77 lines
2.3 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML><HEAD>
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<TITLE>Server Pool Management</TITLE>
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</HEAD>
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<!-- Background white, links blue (unvisited), navy (visited), red (active) -->
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<BODY
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#000080"
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ALINK="#FF0000"
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>
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<!--#include virtual="header.html" -->
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<blockquote><strong>Warning:</strong>
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This document has not been updated to take into account changes
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made in the 2.0 version of the Apache HTTP Server. Some of the
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information may still be relevant, but please use it
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with care.
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</blockquote>
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<H1 ALIGN="CENTER">Server Pool Management</H1>
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<HR>
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<P>
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We found that many people were using values for "MaxServers" either
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too high or too low, and were hanging themselves on it. The model we
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adopted is still based on long-lived minimal-forking processes, but
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instead of specifying one number of persistent processes, the
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web-master specifies a maximum and minimum number of processes to be
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"spare" - every couple of seconds the parent checks the actual number
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of spare servers and adjusts accordingly. This should keep the number
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of servers concurrently running relatively low while still ensuring
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minimal forking.
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<P>
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We renamed the current StartServers to MinSpareServers, created
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separate StartServers parameter which means what it says, and renamed
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MaxServers to MaxSpareServers (though the old name still works, for
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NCSA 1.4 back-compatibility). The old names were generally regarded
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as too confusing.
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<P>
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The defaults for each variable are:
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<PRE>
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MinSpareServers 5
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MaxSpareServers 10
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StartServers 5
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</PRE>
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There is an absolute maximum number of simultaneous children defined
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by a compile-time limit which defaults to 256 and a "MaxClients"
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directive which specifies the number of simultaneous children that
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will be allowed. MaxClients can be adjusted up to the compile-time
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limit (HARD_SERVER_LIMIT, defined in httpd.h). If you need more
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than 256 simultaneous children, you need to modify both HARD_SERVER_LIMIT
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and MaxClients.<P>
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In versions before 1.2, HARD_SERVER_LIMIT defaulted to 150.<P>
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We do not recommend changing either of these values unless:
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<OL>
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<LI>You know you have the server resources to handle more
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<LI>You use the machine for other purposes and must limit the amount of memory
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Apache uses
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</OL>
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<!--#include virtual="footer.html" -->
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</BODY></HTML>
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