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Performance Counters
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One of the most obvious choices for exposing status information is through performance counters. It should not be surprising that WCF includes a large number of built-in performance counters. Although using the Performance Monitor application to view the counters or using the PerformanceCounter object to modify counter values is beyond the scope of this book, a number of WCF-specific performance counters must be given consideration.
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Modifying performance counters
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If you are interested in finding out how to modify existing performance counters, read the article entitled Walkthrough: Changing and Retrieving Performance Counter Values, which can be found at http://msdn.microsoft.com/en-us/library/s155t6ta(VS.71).aspx.
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Enabling the Counters
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By default, the WCF performance counters are turned off because the counters have the potential to increase the memory footprint of the WCF application significantly. To enable the performance counters, the following section should be added to the configuration file, on either the client or the service side:
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<system.serviceModel> <diagnostics performanceCounters="All" /> </system.serviceModel>
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Lesson 4: Monitoring WCF
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The performanceCounters attribute is one of a set of values that determine which group or groups of performance counters are displayed. Table 6-4 displays the list of valid values.
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Table 6-4
Values for performanceCounters Attribute
Description All the categories of counters (ServiceModelService, ServiceModelEndpoint, and ServiceModelOperation) are enabled. Only the ServiceModelService counters are enabled. No counters, regardless of category, are enabled.
Value All ServiceOnly Off
It is also possible to enable performance counters imperatively. The following code sample demonstrates how to do this. For the code to be executed, the System.Configuration, System.ServiceModel.Configuration, and System.ServiceModel.Diagnostics namespaces need to be referenced by the containing project:
' VB Dim config As Configuration = ConfigurationManager.OpenExeConfiguration( _ ConfigurationUserLevel.None) Dim sg As ServiceModelSectionGroup = _ ServiceModelSectionGroup.GetSectionGroup(config) sg.Diagnostic.PerformanceCounters = PerformanceCounterScope.All config.Save() // C# Configuration config = ConfigurationManager.OpenExeConfiguration( ConfigurationUserLevel.None); ServiceModelSectionGroup sg = ServiceModelSectionGroup.GetSectionGroup(config); sg.Diagnostic.PerformanceCounters = PerformanceCounterScope.All; config.Save();
As you can readily deduce from Table 6-4, WCF contains three categories of performance counters: service, endpoint, and operation. Service Performance Counters The group of counters called ServiceModelService is responsible for tracking information about a WCF service as a whole. In Performance Monitor, you see these counters under the ServiceModelService 3.0.0.0 label. Each instance for these counters has a name with a pattern of ServiceName@ServiceEndpointAddress. The types of counters in this group fall into a number of basic categories, as displayed in Table 6-5.
Table 6-5
Performance Counters in the ServiceModelService
Description This type includes the number and duration of the call; the number of failed calls; the number of faulted and outstanding calls; and the rates for calls per second, failed calls per second, and faulted calls per second.
Counter Type Call
6
Instrumentation
Table 6-5
Performance Counters in the ServiceModelService
Description This type shows the number of instances created and the rate at which they are created. This is an interesting category in that the creation of an instance is not always what people expect. A new instance can be created when a message is received by an existing service or when a single instance might be transferred from one session to another. Don t assume this counter is the number of times a service becomes active. This type shows the number and rate for dropped, rejected, and poisoned messages in a queue. A poisoned message is one that is permanently unable to be successfully processed by the receiving application. This type shows the number of messages dropped (including a persecond rate) and the number of sessions faulted (with a per-second rate). This type displays the number of calls that were not authorized and the number of validation and authorization failures. These counters include a per-second rate. This type shows the number of aborted and commit-transacted requests. It also includes the number of transactions that have not yet been resolved and how many transactions were propagated from a client to the service. For each of these, a per-second rate is included.
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