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This is a good example of one of the most prevalent and hazardous bits of programming folklore: that comments should be used to document especially tricky or sensitive sections of code. The reasoning is that people should know they need to be careful when they re working in certain areas. This is a scary idea. Commenting tricky code is exactly the wrong approach to take. Comments can t rescue difficult code. As Kernighan and Plauger emphasize, Don t document bad code rewrite it (1978). One study found that areas of source code with large numbers of comments also tended to have the most defects and to consume the most development effort (Lind and Vairavan 1989). The authors hypothesized that programmers tended to comment difficult code heavily. When someone says, This is really tricky code, I hear them say, This is really bad code. If something seems tricky to you, it will be incomprehensible to someone else. Even something that doesn t seem all that tricky to you can seem impossibly convoluted to another person who hasn t seen the trick before. If you have to ask yourself, Is this tricky , it is. You can always find a rewrite that s not tricky, so rewrite the code. Make your code so good that you don t need comments, and then comment it to make it even better. This advice applies mainly to code you re writing for the first time. If you re maintaining a program and don t have the latitude to rewrite bad code, commenting the tricky parts is a good practice.

garbage collection of generation 0 . Microsoft s goal is to have garbage collections take no more time than an ordinary page fault .

A generational garbage collector also assumes that objects that have lived a long time will continue to live . So it s likely that the objects in generation 1 will continue to be reachable from the application . Therefore, if the garbage collector were to examine the objects in generation 1, it probably wouldn t find a lot of garbage . As a result, it wouldn t be able to reclaim much memory . So it is likely that collecting generation 1 is a waste of time . If any garbage happens to be in generation 1, it just stays there . The heap now looks like Figure 21-11 .

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For details on formatting data, see "Laying Out Data Declarations" in Section 31.5. For details on how to use data effectively, see s 10 through 13.

Compiling the source code Preparing the database Performing tests Analyzing the code Creating installation routines and deploying Creating documentation

FIguRE 21-11 After two collections, generation 0 survivors are promoted to generation 1 (growing the size of

Comments for variable declarations describe aspects of the variable that the variable name can t describe. It s important to document data carefully; at least one company that has studied its own practices has concluded that annotations on data are even more important than annotations on the processes in which the data is used (SDC, in Glass 1982). Here are some guidelines for commenting data:

As you can see, all of the generation 0 objects that survived the collection are now part of generation 1 . Because the garbage collector didn t examine generation 1, object B didn t have its memory reclaimed even though it was unreachable at the time of the last garbage collection . Again, after a collection, generation 0 contains no objects and is where new objects will be placed . In fact, let s say that the application continues running and allocates

Comment the units of numeric data If a number represents length, indicate whether the length is expressed in inches, feet, meters, or kilometers. If it s time, indicate whether it s expressed in elapsed seconds since 1-1-1980, milliseconds since the start of the program, and so on. If it s coordinates, indicate whether they represent latitude, longitude, and altitude and whether they re in radians or degrees; whether they represent an X, Y, Z coordinate system with its origin at the earth s center; and so on. Don t assume

For the curious, here are some more details about this . When the JIT compiler produces native code that modifies a reference field inside an object, the native code includes a call to a write barrier method . This write barrier method checks if the object whose field is being modified is in generation 1 or 2 and if it is, the write barrier code sets a bit in what is called the card table . The card table has 1 bit for every 128-byte range of data in the heap . When the next GC starts, it scans the card table to know which objects in generations 1 and 2 have had their fields changed since the last GC . If any of these modified objects refer to an object in generation 0, then the generation 0 objects survive the collection . After the GC, the card table is reset to all zeroes . The write barrier code causes a slight performance hit when writing to a reference field in an object (as opposed to a local variable or static field) and that performance hit is slightly worse if that object is in generation 1 or 2 .

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