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Extra info for 20687A Configuring Windows 8 Setup Guide, Trainer Preparation Guide

Example text

Then genloadavg() is called to process both CPU partition and the system wide arrays, and return the average for the last ten seconds. This value is fed to calcloadavg(), which applies exponential decays for the 1-, 5-, 15-minute values, saving the results in hp_avenrun[] or cp_hp_avenrun[] for the CPU partitions. hp_avenrun[] is then converted into avenrun[]. This means that these load averages are damped more than once. First through a rolling ten second average, and then through exponential decays.

Iostat(1M). Disk I/O subsystem operations, bandwidth, and utilization. • netstat(1M). Network interface packet rates, errors, and collisions. • kstat(1M). Name-based output of kstat counter values. • sar(1). Catch-all reporting of a broad range of system statistics; often regularly scheduled to collect statistics that assist in producing reports on such vital signs as daily CPU utilization. The utilities listed above extract data values from the underlying kstats and report per-second counts for a variety of system events.

Vmstat Tool The vmstat tool provides a glimpse of the system's behavior on one line and is often the first command you run to familiarize yourself with a system. It is useful here because it indicates both CPU utilization and saturation on one line. $ vmstat 5 kthr memory r b w swap free re mf 0 0 0 1324808 319448 1 2 2 0 0 1318528 302696 480 6 3 0 0 1318504 299824 597 0 2 0 0 1316624 297904 3 0 2 0 0 1311008 292288 2 0 2 0 0 1308240 289520 2 0 2 0 0 1307496 288768 5 0 ... page disk pi po fr de sr dd f0 s1 -2 0 0 0 0 0 0 0 0 371 0 0 0 0 73 0 0 0 371 0 0 0 0 48 0 0 0 597 0 0 0 0 91 0 0 0 485 0 0 0 0 83 0 0 0 749 0 0 0 0 107 0 0 0 201 0 0 0 0 58 0 0 0 faults sy 21 5971 8529 2009 2357 2246 2231 in 403 550 498 584 569 615 518 cs 54 190 163 242 252 290 210 cpu us sy 0 1 84 16 81 19 84 16 77 23 82 18 79 21 id 99 0 0 0 0 0 0 The first line is the summary since boot, followed by samples every five seconds.

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20687A Configuring Windows 8 Setup Guide, Trainer Preparation Guide


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