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On a multiprocessor system running the workstation (MSCorWks.dll) or server (MSCorSvr.dll) version of the execution engine, generation 0 of the managed heap is partitioned into multiple memory arenas, one arena per thread. This allows multiple threads to make allocations simultaneously so that exclusive access to the heap isn t required.
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On a multiprocessor system running the server version of the execution engine (MSCorSvr.dll), the managed heap is split into several sections, one per CPU. When a garbage collection is initiated, the garbage collector has one thread per CPU; each thread collects its own section in parallel with the other threads. Parallel collections work well for server applications where the worker threads tend to exhibit uniform behavior. The workstation version of the execution engine (MSCorWks.dll) 388
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On a multiprocessor system running the workstation version of the execution engine (MSCorWks.dll), the garbage collector has an additional background thread that collects objects concurrently, while the application runs. When a thread allocates an object that pushes generation 0 over its threshold, the garbage collector first suspends all threads and then determines which generations to collect. If the garbage collector needs to collect generation 0 or 1, then it proceeds as normal. However, if generation 2 needs collecting, the size of generation 0 grows beyond its threshold to allocate the new object and the application s threads are resumed. While the application threads are running, the garbage collector has a normal priority background thread that builds the graph of unreachable objects. This thread competes for CPU time with the application s threads, causing the application s tasks to execute more slowly; however, the concurrent collector runs only on multiprocessor systems, so you shouldn t see much of a degradation. Once the graph is built, the garbage collector suspends all threads again and decides whether or not to compact memory. If the garbage collector decides to compact memory, then memory is compacted, root references are fixed up, and the application s threads are resumed this garbage collection takes less time than usual because the graph of unreachable objects has already been built. However, the garbage collector might decide not to compact memory; in fact, the garbage collector favors this approach. If you have a lot of free memory, the garbage collector won t compact the heap; this improves performance but grows your application s working set. When using the concurrent garbage collector, you ll typically find that your application is consuming more memory than it would compared with the nonconcurrent garbage collection. To summarize, concurrent collection makes for a better interactive experience for users and is therefore best for interactive CUI or GUI applications. For some applications, however, concurrent collection will actually hurt performance and will cause more memory to be used. When testing your application, you should experiment with and without concurrent collection and see which approach gives the best performance and memory usage for your application. You can tell the CLR not to use the concurrent collector by creating a configuration file (as discussed in s 2 and 3) that contains a gcConcurrent element for the application. Here s an example of a configuration file:
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<configuration> <runtime> <gcConcurrent enabled="false"/> </runtime> </configuration>
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You can also use the Microsoft .NET Framework Configuration administrative tool to create an application configuration file containing the gcConcurrent element. To do this, open Control Panel, select Administrative Tools, and then invoke the Microsoft .NET Framework Configuration tool. In the tool, go to the Applications node in the left hand tree pane and add an application or select an existing application. Then right click on the application and select Properties. The dialog box shown in Figure 19 15 will appear.
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Figure 19 15 : Configuring an application to use the concurrent garbage collector using the Microsoft .NET Framework Configuration administrative tool The radio buttons under the Garbage Collection Mode selection set the gcConcurrent element s enabled attribute to true or false, respectively.
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