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Because I had previously configured Process Explorer to retrieve symbols for operating system images from the Microsoft public symbol server, the thread list also showed the names of the thread start functions. The most active threads began in the ExpWorkerThread function, which means that they were worker threads that perform work on behalf of the system and device drivers.
Instead of creating dedicated threads that consume memory resources, the system and drivers can throw work at the shared pool of operating system worker threads. I really needed to know what functions the worker threads were calling, because the functions would be inside the device driver or operating system component on whose behalf the threads were running. On Vista, however, you get this error when you try and look at the stack for threads in the System process:.
Protected processes were introduced to support Digital Rights Management DRM so that hi-definition content providers can store content encryption keys with a reduced risk of an administrative user using DRM-stripping tools to reach into the process and read the keys. That approach foiled, I had to find another way to see what the worker threads were doing.
KernRate can profile user-mode processes and kernel-mode threads. It uses the sample-based profiling facility that was introduced in the first release of Windows NT, which records the unique addresses at which the CPU is executing when the profiling interval timer fires. Percentages and graphs of the usage of standalone and system programs can be monitored. This will give a fair idea of whether the CPU is being over-utilized and can help pinpoint which applications are causing spikes.
The user can control which tasks he or she wants to keep running, and terminate high CPU consuming tasks. Virus attacks are another common cause for CPU spikes. Some viruses automatically open multiple programs simultaneously; this also considerably strains the CPU.
Installing an updated antivirus program and running it regularly can help avoid spikes due to virus attacks. Computers that have been continually used for more than 12 hours without being shut down or placed in hibernation mode can decrease in performance due to overheating of the motherboard.
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