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Processor\ % User Time Monitors the percentage of nonidle processor time that is spent in user mode. A high rate could indicate a need to upgrade or install additional processors. Use this counter in conjunction with Processor\ % Processor Time (all instances).

Introducing Windows Workflow Foundation (WF)

Processor\ % Privileged Time Monitors the percentage of nonidle processor time designated for hardware-manipulating drivers and operating system components. A high rate might be attributed to a large number of interrupts being generated by a device that is failing. Use this counter in conjunction with Processor\ % Processor Time (all instances). Under the Hood Tips for Processor Monitoring Try the following to resolve problems with the processor:

The Issuer Unique ID and Subject Unique ID fields improved the certificate chaining process. The process now finds the CA certificate by matching the issuer name in the issued certificate to the subject name in the CA certificate and performs a second check by matching the Issuer Unique ID in the issued certificate with the Subject Unique ID of the CA certificate. This additional level of matching allows a distinction between CA certificates when the CA renews a certificate. This method also allows for a distinction between CAs with the same subject name. (The likelihood of CA certificates with the same name increases when simple names are used for example, CN=Root CA rather than CN=Fabrikam Industries Inc. Corporate Root CA,O=Fabrikam,C=NL.) Although the addition of the Issuer Unique ID and Subject Unique ID aids in chain building, it s still possible for collisions to occur when two certificates share the same Subject Name and Subject Unique ID fields.

Upgrade the processor Upgrade to a faster processor, replace a failing one, or add another processor to the machine, especially if you are running multithreaded programs.

If you re familiar with ASP.NET programming, this context object serves essentially the same purpose as the System.Web.HttpContext object. Those familiar with .NET Framework programming may find similarities between this context object and System.Threading.Thread.CurrentContext. The goal of all of these context objects is the same to provide a place to store and easily recall information specific to a currently executing instance. In this case, it s an instance of an executing activity.

Adjust the workload of the system Distribute programs more efficiently among servers, or schedule programs to run at off-peak hours.

Within Table 4-2, you ll also see something known as a DependencyProperty. If you ve looked at the code we ve used so far in the preceding chapters, sprinkled into the workflow code that Visual Studio generated for you are events based on dependency properties. What is a DependencyProperty Normally, if you create a property for a class, you also create a field within the class to store the property value. This type of code is common:

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class MyClass { protected Int32 _x = 0; ... public Int32 X { get { return _x; } set { _x = value; } } }

Note Although the X.509 version 2 format improved on the version 1 format, the standard was not widely supported. In fact, RFC 3280, Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile, recommends the omission of these X.590 version 2 fields.

the processor affinity with respect to interrupts and process threads can improve performance because it reduces the number of processor cache flushes during thread movement from one processor to another. You set affinity for a particular process or program when you assign it to a single processor to improve its performance, at the expense of the other processors. Be warned that when you dedicate a process or program to a processor, your other program threads might not be permitted to migrate to the least busy processor. You can set affinity in Task Manager, and it is available only on multiprocessor systems.