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High processor values can mean either that your machine is handling the workload in a very efficient manner or that it is struggling to keep up. When a bottleneck occurs because a process s threads need more processor cycles than are available, long processor queues build up, causing the system response to suffer. The two common causes of processor bottleneck are excess demand placed on the processor by CPU-bound programs and excess interrupts generated by drivers or subsystem components, such as disk or network components.

Subject Unique ID. An optional field that contains a unique identifier, typi cally a hexadecimal string, for the certificate s subject as defined by the issuing CA. If the subject is also a CA, this unique identifier is placed in the Issuer Unique ID.

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The minimum recommended counters for monitoring the server s processor component for possible bottlenecks are the following.

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Purpose Raises an event associated with the specified DependencyProperty. Raises the event associated with the referenced DependencyProperty. The effect of RaiseEvent and RaiseGenericEvent is the same fire an event. RaiseEvent uses the dependency property directly, while RaiseGenericEvent is the generic (templated) version. Saves a copy of the activity to a stream.

interrupt activity is causing a bottleneck. A dramatic increase in this counter value without a corresponding increase in system activity indicates a hardware problem. To resolve this problem, you need to find the network adapter or other device that is the source of the interrupts. Refer to the manufacturer s specifications for the acceptable processor threshold; use 1000 interrupts per second as a starting point.

The activity methods are generally all both virtual and protected. The intention is for you to override them and provide implementations specific to your own activity s needs. By far the most critical method is Execute. This method, when called by the workflow runtime, is the method where your activity s magic happens. Activities can be grouped into two primary camps: composite and basic. Composite activities contain other activities, and an excellent example of this is the sequential activity we ve been using throughout the book so far. All the sample applications so far have implemented their workflow instances as sequential activities that contained other activities, such as if-else, delay, and code activities. Basic activities, such as the delay and code activities I just mentioned, are the single-minded task-based activities I referred to earlier in the chapter. Ultimately, you ll need basic activities to actually carry out specific pieces of work. Composite activities might direct the flow of work and data, but it s the basic activity that does the number crunching.

processor spends receiving and servicing hardware interrupts during the sample interval. This value provides an indirect indication of the activities of devices that generate interrupts, such as disk drives, network adapters, and other peripheral devices. These devices interrupt the processor when they require attention or complete a task. Look for a dramatic increase in the value without a corresponding increase in system activity. To monitor possible usage problems, use these counters:

Note In addition to introducing the Issuer Unique ID and Subject Unique ID fields, the X.509 version 2 certificate s Version field changed to a value of 2 to indicate the version number.

Processor\ % Processor Time (all instances) Use this counter to discover a process that is using more than 85 percent of processor time. You might need to install an additional processor or upgrade to a faster one.

Many of the Activity object s methods require an ActivityExecutionContext object as input. The ActivityExecutionContext object is created when the workflow runtime queues your workflow instance for execution. Therefore, it isn t something you create directly. The workflow runtime creates it for you. The ActivityExecutionContext object s purpose is to provide the activity with methods and services tied to the workflow instance, such as for initialization, timers, and general execution flow. It s essentially a helper object. 13 discusses activity context in a bit more detail. For now, though, it s enough to think of it as a collection of runtime properties and helper methods the workflow runtime maintains so the entire workflow process stays on track.