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    <p><code>%util</code> is named busy in the source code of iostat: <a href="https://code.google.com/p/tester-higkoo/source/browse/trunk/Tools/iostat/iostat.c#380" rel="noreferrer">https://code.google.com/p/tester-higkoo/source/browse/trunk/Tools/iostat/iostat.c#380</a></p> <p>Busy is counted as percent ratio of <code>Ticks</code> to <code>deltams</code>, limited to 100%</p> <pre><code>busy = 100.0 * blkio.ticks / deltams; /* percentage! */ if (busy &gt; 100.0) busy = 100.0; </code></pre> <p>DeltaMS is sum of system load for the period of time (user time + system time + idle time + iowait)/ ncpu.</p> <pre><code>double deltams = 1000.0 * ((new_cpu.user + new_cpu.system + new_cpu.idle + new_cpu.iowait) - (old_cpu.user + old_cpu.system + old_cpu.idle + old_cpu.iowait)) / ncpu / HZ; </code></pre> <p>Ticks - is the <code>Time of requests in queue</code> for the period</p> <pre><code>blkio.ticks = new_blkio[p].ticks - old_blkio[p].ticks; </code></pre> <p>In more current version of sysstat the code is bit different: <a href="http://sources.debian.net/src/sysstat/10.2.0-1/iostat.c#L959" rel="noreferrer">http://sources.debian.net/src/sysstat/10.2.0-1/iostat.c#L959</a></p> <pre><code>/* rrq/s wrq/s r/s w/s rsec wsec rqsz qusz await r_await w_await svctm %util */ printf(" %8.2f %8.2f %7.2f %7.2f %8.2f %8.2f %8.2f %8.2f %7.2f %7.2f %7.2f %6.2f %6.2f\n", ... /* * Again: Ticks in milliseconds. * In the case of a device group (option -g), shi-&gt;used is the number of * devices in the group. Else shi-&gt;used equals 1. */ shi-&gt;used ? xds.util / 10.0 / (double) shi-&gt;used : xds.util / 10.0); /* shi-&gt;used should never be null here */ </code></pre> <p>xds is filled in the <code>compute_ext_disk_stats(&amp;sdc, &amp;sdp, itv, &amp;xds);</code> <a href="http://sources.debian.net/src/sysstat/10.2.0-1/common.c?hl=679#L679" rel="noreferrer">http://sources.debian.net/src/sysstat/10.2.0-1/common.c?hl=679#L679</a></p> <pre><code>/* * Macros used to display statistics values. * * HZ is 1024 on IA64 and % should be normalized to 100. */ #define S_VALUE(m,n,p) (((double) ((n) - (m))) / (p) * HZ) xds-&gt;util = S_VALUE(sdp-&gt;tot_ticks, sdc-&gt;tot_ticks, itv); </code></pre> <p>And there is the filling of tot_ticks from iostat.c</p> <pre><code> * @ioi Current sample statistics. * @ioj Previous sample statistics. * @itv Interval of time. ... sdc.tot_ticks = ioi-&gt;tot_ticks; sdp.tot_ticks = ioj-&gt;tot_ticks; </code></pre> <p><code>tot_ticks</code> are read from "<em>sysfs stat for current block device or partition</em>" in <code>read_sysfs_file_stat</code> (<a href="http://sources.debian.net/src/sysstat/10.2.0-1/iostat.c#L474" rel="noreferrer">iostat.c:487</a>), and <code>ioi</code> and <code>ioj</code> are current and previous stat.</p>
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    1. POHow the util of iostat is computed?
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    1. COThank you very much, but I don't know how to accept your answer?
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    2. CO@Raymond, did you get, what does "Time of requests in queue" mean? I can't understand this parameter fully, but i think it is something like mean time between issuing and fulfilling of disk requests
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