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Speed and scalability should apply to more than just your web servers. Many aspects of web development can and should be fast and scalable. All of your code should be fast, whether it runs at the client, in the web tier, or in the data tier. All of your pages should be fast, not just a few of them. Your changes, fixes, and deployments should also be fast. A definite synergy happens when you apply speed and scalability deeply in a project. Not only will your customers and users be happier, but engineers too will be happier and will feel more challenged. Surprisingly, less hardware is often required, and quality assurance and operations teams can often be smaller. That s what I mean by ultra-fast and ultra-scalable. (I will often refer to it as just ultra-fast for short, even though scalability is always implied.) The ultra-fast approach is very different from an impulsive, do-it-now type of programming. The architectural problems that inevitably arise when you don t approach development in a methodical way tend to significantly offset whatever short-term benefits you might realize from taking shortcuts. Most large-scale software development projects are marathons, not sprints; advance planning and preparation pay huge long-term benefits. I ve summarized the goals of the ultra-fast and ultra-scalable approach in Table 1-1.

This tells Apache that when a request attempts to access a script called external.fcgi in /cgi-bin, it should make a connection to port 2001 on the server fcgi.alpha-prime.com and deliver the request to it. The complete list of options (see Table 6-10) that FastCgiExternalServer understands is short because with external FCGI scripts mod_fastcgi is only responsible for connecting to the script, not managing it.

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Of course, these are just the tip of the iceberg. There are several more that may prove to be useful to you. Each of them also has a pre and a post version. These enable you to do more than one transformation at a time in sequence. For instance, you could do a preScale and then setRotate or a setScale and then postRotate. Changing the order of when they occur could yield vastly different results depending on the operations performed. Figure 3 11 shows the results of the following two method calls.

How long to try to connect to the script before returning an error to the client. How long to wait for a FastCGI application to respond before aborting and logging an error. Writes data to the client as it s received from the script, like CGI scripts (or old-style nph scripts). The host and port to communicate with a remote script. One only of -host and -socket must be defined. The name of a header to pass to the external application. The Unix domain socket to communicate with a local script. One only of -host and -socket must be defined.

Every page is scalable and fast under load. All tiers are scalable and fast under load. You can respond quickly to changing business needs, and you can readily maintain performance and scalability in the event of changes. You can quickly find and fix performance-related bugs. You can quickly deploy and grow your sites. Capacity planning is straightforward and reliable. Your servers are well utilized under load; fewer machines are required.

Because FCGI scripts that run externally aren t cached or managed by mod_fastcgi, they re responsible for their own availability. To assist with this, the FastCGI development kit comes with a utility for starting FastCGI applications independently of Apache and mod_fastcgi, called cgi-fcgi. This allows you to start a FastCGI application independently of Apache by configuring a port for it to listen to. In the previous FastCgiExternalServer directive, you used port 2001, so you would use cgi-fcgi on the server fcgi.alpha-prime.com such as this:

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matrix.setScale(1.5f, 1); matrix.postRotate(15,bmp.getWidth()/2,bmp.getHeight()/2);

The 5 at the end of this command is the number of instances you want to start up analogous to the -processes option of a static application started with Apache. Note that in this scenario, Apache has no idea what the application actually is. It only knows the server and port to contact. The filename specified is only significant in terms of the URL that will cause Apache to pass the request to mod_fastcgi and hence to the external application. cgi-fcgi has a number of other uses, notably as a CGI to FastCGI bridge (hence its name). I ll touch on this briefly next. You can also dispense with cgi-fcgi if you use a more modern approach to writing the application that uses the OpenSocket, CloseSocket, and Request methods in modern releases of FCGI.pm:

#!/usr/bin/perl -Tw use strict; use FCGI; my $socket=FCGI::OpenSocket(":2001", 5); # '5' is size of queue for incoming requests my $request=FCGI::Request(\*STDIN,\*STDOUT,\*STDERR,\%ENV,$socket); my ($now,$then); while ($request->Accept()>=0) { $now=time(); print "Content-type: text/plain\n\n"; print "You've now called me ${count} times". "and this is still the only response you're going to get\n"; print "The last time was ",$now-$then," seconds ago.\n"; $then=$now; } FCGI::CloseSocket($socket) exit 0;

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