4.2. Kernel Instrumentation and Measurement Interface
In HP-UX, event traces are generated by the kernel using a mechanism called Kernel Instrumentation (KI). They are written into a circular buffer in the kernel for each occurrence of events such as:
System call (operating system intrinsic)
Context switch (from one user process to another)
Page outs
I/O events
There are more than three hundred different system calls in HP-UX that normally occur at a rate of thousands of calls per second. Context switches occur quite often, sometimes hundreds or thousands of times per second. Therefore, HP-UX event traces can result in a large amount of data generated. The overhead associated with kernel-generated event traces, although larger than that of counters, ...
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