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When the application attempts to allocate object T, generation 0 is full, and a garbage collection must start . This time, however, the garbage collector sees that the objects in generation 1 are occupying so much memory that generation 1 s 2-MB budget has been reached . Over the several generation 0 collections, it s likely that a number of objects in generation 1 have become unreachable (as in our example) . So this time, the garbage collector decides to examine all of the objects in generation 1 and generation 0 . After both generations have been garbage collected, the heap now looks like Figure 21-15 .

Dim antennaLength As Long Dim signalStrength As Integer Dim characterCode As Integer Dim characterSize As Integer

FIguRE 21-15 After four collections: generation 1 survivors are promoted to generation 2, generation 0

Comment limitations on input data Input data might come from an input parameter, a file, or direct user input. The guidelines above apply as much to routine-input parameters as to other kinds of data. Make sure that expected and unexpected values are documented. Comments are one way of documenting that a routine is never supposed to receive certain data. Assertions are another way to document valid ranges, and if you use them the code becomes that much more self-checking.

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As before, any objects that were in generation 0 that survived the garbage collection are now in generation 1; any objects that were in generation 1 that survived the collection are now in generation 2 As always, generation 0 is empty immediately after a garbage collection and is where new objects will be allocated Objects in generation 2 are objects that the garbage collector has examined two or more times There might have been several collections, but the objects in generation 1 are examined only when generation 1 reaches its budget, which usually requires several garbage collections of generation 0 The managed heap supports only three generations: generation 0, generation 1, and generation 2; there is no generation 3 3 When the CLR initializes, it selects budgets for all three generations .

The build process updates many files, some of them more than once. Examples include build logs, program database (.pdb) files, and updated zip files. The problem is that if a file is updated multiple times (see figure 12.1), it takes longer to create multiple input files than to create the final file one time (see figure 12.2). Figure 12.1 shows a serialized process that updates an output file more than once. Source file 1 is processed, and the result placed in the output file. A second source file

As I mentioned earlier, the budget for generation 0 is about 256 KB, and the budget for generation 1 is about 2 MB The budget for generation 2 is around 10 MB Again, the budget sizes are selected to improve performance The larger the budget, the less frequently a garbage collection will occur And again, the performance improvement comes because of the initial assumptions: new objects have short lifetimes, and older objects are likely to live longer The CLR s garbage collector is a self-tuning collector This means that the garbage collector learns about your application s behavior whenever it performs a garbage collection For example, if your application constructs a lot of objects and uses them for a very short period of time, it s possible that garbage collecting generation 0 will reclaim a lot of memory .

Document flags to the bit level If a variable is used as a bit field, document the meaning of each bit, as in the next example.

In fact, it s possible that the memory for all objects in generation 0 can be reclaimed If the garbage collector sees that there are very few surviving objects after collecting generation 0, it might decide to reduce the budget of generation 0 from 256 KB to 128 KB This reduction in the allotted space will mean that garbage collections occur more frequently but will require less work for the garbage collector, so your process s working set will be small In fact, if all objects in generation 0 are garbage, a garbage collection doesn t have to compact any memory; it can simply set NextObjPtr back to the beginning of generation 0, and then the garbage collection is performed Wow, this is a fast way to reclaim memory! Note The garbage collector works extremely well for applications with threads that sit idle at.

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