0 we measured the number of clock cycles for various

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Unformatted text preview: inactivity. Details of this program are described later in the chapter. An example of such a trace is shown in Figure 9.3, generated while running on a Linux machine with a clock rate of around 550 MHz. Each period is labeled as either active (“A”) or inactive “I”). The periods are numbered 0 to 9 for identification. For each period, the start time (relative to the beginning of the trace) and the duration are indicated. Times are expressed in both clock cycles and milliseconds. This trace shows a total of 20 time periods (10 active and 10 inactive) having a total duration of 66.9 ms. In this example, the periods of inactivity are fairly short, with the longest being 0.50 ms. Most of these periods of inactivity were caused by timer interrupts. The process was active for around 95.1% of the total time monitored. Figure 9.4 shows a graphical rendition of the trace shown in Figure 9.3. Observe the regular spacing of the boundaries between the activity periods indicated by the gray triangles....
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This note was uploaded on 09/02/2010 for the course ELECTRICAL 360 taught by Professor Schultz during the Spring '10 term at BYU.

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