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When the CLR starts, it selects a GC mode, and this mode cannot change during the lifetime of the process . There are two basic GC modes:
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Workstation This mode fine-tunes the garbage collector for client-side applications . The garbage collector assumes that other applications are running on the machine and does not hog CPU resources . The Workstation mode can have two submodes: Workstation with the concurrent collector and Workstation without the concurrent collector . I ll describe the concurrent collector feature shortly . Server This mode fine-tunes the garbage collector for server-side applications . The garbage collector assumes that no other applications (client or server) are running on the machine and it assumes that all the CPUs on the machine are available to do a garbage collection . This GC mode causes the managed heap to be 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 in which the worker threads tend to exhibit uniform behavior . This feature requires the application to be running on a computer with multiple CPUs so that the threads can truly be working simultaneously to attain a performance improvement .
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By default, applications run with the Workstation GC mode, and the concurrent collector is turned on . However, a server application (such as ASP .NET or SQL Server) that hosts the CLR can request the CLR to load the Server GC . However, if the server application is running on a uniprocessor machine, then the CLR will load the Workstation GC mode without the concurrent collector . An application that self-hosts the CLR can tell the CLR to use the server collector by creating a configuration file (as discussed in 2, Building, Packaging, Deploying, and Administering Applications and Types, and 3, Shared Assemblies and Strongly Named Assemblies ) that contains a gcServer element for the application . Here s an example of a configuration file:
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<configuration> <runtime> <gcServer enabled="true"/> </runtime> </configuration>
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When an application is running, it can ask the CLR if it is running in the Server GC mode by querying the GCSettings class s IsServerGC read-only Boolean property:
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using System; using System.Runtime; // GCSettings is in this namespace public static class Program { public static void Main() { Console.WriteLine("Application is running with server GC=" + GCSettings.IsServerGC); } }
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The Workstation GC mode can run in concurrent or non-concurrent mode . In concurrent mode, 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 budget, 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, it proceeds as normal . However, if generation 2 needs collecting, the size of generation 0 will be increased beyond its budget to allocate the new object, and then the application s threads are resumed . While the application s threads are running, the garbage collector has a normal priority background thread that marks unreachable objects . This thread competes for CPU time with the application s threads, causing the application s tasks to execute more slowly . Once the objects are marked, the garbage collector suspends all threads again and decides whether to compact memory . If the garbage collector decides to compact memory, 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 set 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 with the non-concurrent garbage collector . To summarize: Concurrent collection creates 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 for the application (as discussed in s 2 and 3) that contains a gcConcurrent element . Here s an example of a configuration file:
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