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When using Apache prefork, you want to size your Apache child process pool to avoid process pool churning. In other words, when the Apache server starts, you want to immediately prefork a large pool of Apache processes (as many as your web server memory can support) and have that entire pool of child processes present and waiting for requests, even if they are idle most of the time, rather than constantly incurring the performance overhead of killing and re-spawning Apache child processes in response to the traffic level of the moment. Here are example Apache prefork settings for a Drupal web server running mod_php. StartServers 40 MinSpareServers 40 MaxSpareServers 40 MaxClients 80 MaxRequestsPerChild 20000 This is telling Apache to start 40 child processes immediately, and always leave it at 40 processes even if traffic is low, but if traffic is really heavy, then burst up to 80 child processes. (You can raise the 40 and 80 limits according to your own server dimensions.) You may look at this and ask, Well, isn t that a waste of memory to have big fat idle Apache processes hanging about But remember this: the goal is to have fast page delivery, and there is no prize for having a lot of free memory. My server is slow, but look at all that free RAM!!! If you have the memory, then use it!

Next, assuming you have inserted a new class file into your project, you can move the data fields and constructors to the new file using a simple cut/paste operation. In addition, you must add the partial keyword to this aspect of the class definition. For example: // Employee.Internal.cs partial class Employee { // Field data // Constructors }

Once you compile the modified project, you should see no difference whatsoever. The whole idea of a partial class is only realized during design time. Once the application has been compiled, there is just a single, unified class within the assembly. The only requirement when defining partial types is that the type s name (Employee in this case) is identical and defined within the same .NET namespace. To be honest, you will most likely not need to make use of partial class definitions too often. However, Visual Studio uses them in the background all the time. Later in this book when you start to look into GUI application development in Windows Forms, Windows Presentation Foundation, or ASP.NET, you ll see that Visual Studio isolates designer generated code into a partial class, leaving you to focus on your application specific programming logic.

The Timeout setting in the Apache config determines how long a web client can hold a connection open without saying anything. Apache s default Timeout is 5 minutes (300 seconds), which is far too polite. Decrease Apache s Timeout to 20 seconds or less.

Summary

The point of this chapter was to introduce you to the role of the C# class type. As you have seen, classes can take any number of constructors that enable the object user to establish the state of the object upon creation. This chapter also illustrated several class design techniques (and related keywords). Recall that the this keyword can be used to obtain access to the current object, the static keyword allows you to define fields and members that are bound at the class (not object) level, and the const keyword (and readonly modifier) allows you to define a point of data that can never change after the initial assignment. The bulk of this chapter dug into the details of the first pillar of OOP: encapsulation. Here you learned about the access modifiers of C# and the role of type properties, object initialization syntax, and partial classes. With this behind you, you are now able to turn to the next chapter where you will learn to build a family of related classes using inheritance and polymorphism.

The previous chapter examined the first pillar of OOP: encapsulation. At that time, you learned how to build a single well-defined class type with constructors and various members (fields, properties, constants, and read-only fields). This chapter will focus on the remaining two pillars of OOP: inheritance and polymorphism. First, you will learn how to build families of related classes using inheritance. As you will see, this form of code reuse allows you to define common functionality in a parent class that can be leveraged, and possibly altered, by child classes. Along the way, you will learn how to establish a polymorphic interface into the class hierarchies using virtual and abstract members. I wrap up by examining the role of the ultimate parent class in the .NET base class libraries: System.Object.

Comment out any Apache LoadModules if it is certain they re not needed. Such candidates include mod_cgi, mod_dav, and mod_ldap.