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All of these mechanisms are transparent to your application code . To you, the developer, it appears as if there is just one managed heap; these mechanisms exist simply to improve application performance .
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21
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Automatic Memory Management (Garbage Collection)
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Monitoring garbage Collections
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Within a process, there are a few methods that you can call to monitor the garbage collector . Specifically, the GC class offers the following static methods, which you can call to see how many collections have occurred of a specific generation or how much memory is currently being used by objects in the managed heap:
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Int64 GetTotalMemory(Boolean forceFullCollection); Int32 CollectionCount(Int32 generation);
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To profile a particular code block, I have frequently written code to call these methods before and after the code block and then calculate the difference . This gives me a very good indication of how my code block has affected my process s working set and indicates how many garbage collections occurred while executing the code block . If the numbers are high, I know to spend more time tuning the algorithms in my code block . You can also see how much memory is being used by individual AppDomains as opposed to the whole process . For more information about this, see the AppDomain Monitoring section in 22 . When you install the .NET Framework, it installs a set of performance counters that offer a lot of real-time statistics about the CLR s operations . These statistics are visible via the PerfMon .exe tool or the System Monitor ActiveX control that ships with Windows . The easiest way to access the System Monitor control is to run PerfMon .exe and click the + toolbar button, which causes the Add Counters dialog box shown in Figure 21-16 to appear .
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FIguRE 21-16 PerfMon .exe showing the .NET CLR Memory counters
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Core Facilities
To monitor the CLR s garbage collector, select the .NET CLR Memory performance object . Then select a specific application from the instance list box . Finally, select the set of counters that you re interested in monitoring, click Add, and then click OK . At this point, the System Monitor will graph the selected real-time statistics . For an explanation of a particular counter, select the desired counter and then select the Show Description check box . Another great tool for monitoring your application s object allocations is the CLR Profiler . This tool offers call profiling, heap snapshots, and memory-use timelines . There is even an API that can be used from test code to start and stop profiling and inject comments into the logs . Also, the source code for this tool is available so that you can modify the tool for your own needs . The best way to acquire this tool is for you to search the Web for CLR profiler . This tool is invaluable, and I highly recommend it . Finally, you should look into using the SOS Debugging Extension (SOS .dll), which can often offer great assistance when debugging memory problems and other CLR problems . For memory-related actions, the SOS Debugging Extension allows you to see how much memory is allocated within the process to the managed heap, displays all objects registered for finalization in the finalization queue, displays the entries in the GCHandle table per AppDomain or for the entire process, shows the roots that are keeping an object alive in the heap, and more .
22
CLR Hosting and AppDomains
In this chapter: CLR Hosting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AppDomains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AppDomain Unloading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AppDomain Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AppDomain First-Chance Exception Notifications . . . . . . . . . . . . . . . . . . . . . . . . How Hosts Use AppDomains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Advanced Host Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 592 594 609 610 612 612 615
In this chapter, I ll discuss two main topics that really show off the incredible value provided by the Microsoft .NET Framework: hosting and AppDomains . Hosting allows any application to utilize the features of the common language runtime (CLR) . In particular, this allows existing applications to be at least partially written using managed code . Furthermore, hosting allows applications the ability to offer customization and extensibility via programming . Allowing extensibility means that third-party code will be running inside your process . In Microsoft Windows, loading a third party s DLLs into a process has been fraught with peril . The DLL could easily have code in it that could compromise the application s data structures and code . The DLL could also try to use the security context of the application to gain access to resources that it should not have access to . The CLR s AppDomain feature solves all of these problems . AppDomains allow third-party untrusted code to run in an existing process, and the CLR guarantees that the data structures, code, and security context will not be exploited or compromised . Programmers typically use hosting and AppDomains along with assembly loading and reflection . Using these four technologies together makes the CLR an incredibly rich and powerful platform . In this chapter, I ll focus on hosting and AppDomains . In the next chapter, I ll focus on assembly loading and reflection . When you learn and understand all of these technologies, you ll see how your investment in the .NET Framework today will certainly pay off down the line .
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