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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 .

Figure 12-10

One tool you can use to help monitor your traffic is a command-line tool called Netstat. Netstat provides information about existing network connections and network activity statistics.

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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 .

Description Opens the file and seeks to the end, creating the file if it doesn't exist. Can be used for write operations only. Creates a new file if one doesn't exist. Overwrites the file if it does exist. Creates a new file. If the file already exists, an IOException is thrown.

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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.

For instance, if you wanted to determine on which ports a system was listening for connections, you could execute the Netstat a command. This would determine that the ports that you want closed are indeed closed. However, just knowing which ports are open might not be enough data to close the hole. Indeed, you will want to know which application is using that port so you can further investigate the application and close the port. You can figure out the relationship between open ports and applications with the Netstat o command. When you run the Netstat o command, you can see the protocol, the local inbound port that is open, the connection from or to the other computer, and the port it is using, as shown in Figure 12-11.

Opens a file. Throws a FileNotFoundException if the file doesn't exist. Opens a file if one exists; creates a new file otherwise. Sets the file size to 0 and opens the file for writing. Can be used for write operations only.

Figure 12-11