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which reveals all the modules that have been built into your current Apache executable If you see something you don t need, remove it by running the configure script with appropriate command-line options For example, if you do not plan on using CGI scripts or SSIs, you can safely remove those options from Apache by first running the following command from the source distribution directory:
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/configure --prefix=/usr/local/apache \ --disable-cgi --disable-cgid \ --disable-include
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and then recompiling and reinstalling Apache with the make && make install command If your operating system allows you to remove unnecessary symbolic information from executables and then strip them off, then you can save some more memory For example, the following command
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Part VI Tuning for Performance and Scalability
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discards symbols from httpd under Linux This makes the size of the executable a bit smaller, which results in RAM savings for each httpd If you think your Apache executable (httpd) is as lean and mean as it can be but you still suspect the bottleneck is within Apache, then take a close look at your Apache configuration files Some Apache directives are expensive in terms of performance, and they are usually the ones that require domain name resolution, system calls, drive I/O, and process manipulation Apache configuration tuning is discussed in the Tuning the Apache Configuration section
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After you have your server hardware, operating system, and the Apache server itself tuned for performance, the next typical area of bottleneck is the network itself To tune your network you must know the network architecture Most Web servers are run from an Ethernet network be it at the office network or at a co-location facility in an ISP How this network is configured makes a great deal of difference For example, if you have an Apache server connected to an Ethernet hub, which is, in turn, connected to other hubs that are connected to either workstations or servers, you have a great breeding environment for major bottlenecks Each machine sees all the traffic on the network, thus the number of packet collisions increases, and network slow-down is more common However, such a bottleneck is easily remedied by using network switches in place of hubs No special hardware is needed on the devices that connect to an Ethernet switch The same network interface used for shared media 10Base-T hubs will work with an Ethernet switch From that device s perspective, connecting to a switched port is just like being the only computer on the network segment One common use for an Ethernet switch is to break a large network into segments While it is possible to attach a single computer to each port on an Ethernet switch, it is also possible to connect other devices such as a hub If your network is large enough to require multiple hubs, you could connect each of those hubs to a switch port so that each hub is a separate segment Remember that if you simply cascade the hubs directly, the combined network is a single logical Ethernet segment
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The traditional Ethernet is 10MB/sec, which simply is not enough in a modern business environment that includes e-mail-based communication, Internet access, video conferencing, and other bandwidth-intensive operations The 100MB/sec Ethernet is the way to go However, 100 MB/sec or fast Ethernet is still quite expensive if you decide to go with fast switches as well I recommend that you move toward a switched fast Ethernet from now on unless you have already done so The migration path from 10MB/sec to 100MB/sec can be quite expensive if you have a lot of computers in your network Each computer in your network must have
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a 100MB/sec-capable NIC installed, which can be expensive in terms of cost, staff, and time For a large LAN with several hundred users or more, you should do the upgrade one segment at a time You can start by buying 10/100MB dual-speed NICs, which will enable you to support your existing 10MB/sec and your upcoming 100MB/sec infrastructure seamlessly Using fast Ethernet hand-in-hand with switching hardware can bring a high degree of performance to your LAN You should definitely consider this option if possible If you have multiple departments to interconnect, consider an even faster solution between the departments: The emerging Gbit/sec Ethernet standard is very suitable for connecting local area networks together to form a wide area network (WAN)
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