Lines 85-92
The
Link Here
|
85 |
utility displays kernel |
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utility displays kernel |
86 |
.Tn I/O |
86 |
.Tn I/O |
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statistics on terminal, device and cpu operations. |
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statistics on terminal, device and cpu operations. |
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The first statistics that are printed are averaged over the system uptime. |
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The first statistics that are printed are averaged over the system uptime |
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To get information about the current activity, a suitable wait time should |
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(unless |
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|
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.Fl I |
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is specified). |
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Any references to repetitions in this man page implicitly include the first |
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statistics output. |
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To get information about the ongoing activity, a suitable wait time should |
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be specified, so that the subsequent sets of printed statistics will be |
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be specified, so that the subsequent sets of printed statistics will be |
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averaged over that time. |
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averaged over that time. |
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.Pp |
97 |
.Pp |
Lines 96-109
The options are as follows:
Link Here
|
96 |
Repeat the display |
101 |
Repeat the display |
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.Ar count |
102 |
.Ar count |
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times. |
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times. |
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If no repeat |
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If |
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.Ar count |
105 |
.Ar count |
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is specified, the default depends on whether |
106 |
is not specified and a |
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.Fl w |
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.Ar wait |
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is specified. |
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interval is specified, the default repeat count is infinity. |
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With |
109 |
If no |
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.Fl w |
110 |
.Ar wait |
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the default repeat count is infinity, otherwise it is 1. |
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interval is specified, the default repeat count is 1. |
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.It Fl C |
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.It Fl C |
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Display CPU statistics. |
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Display CPU statistics. |
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This is on by default, unless |
114 |
This is on by default, unless |
Lines 132-138
per measurement cycle.
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|
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Display total statistics for a given time period, rather than average |
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Display total statistics for a given time period, rather than average |
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statistics for each second during that time period. |
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statistics for each second during that time period. |
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.It Fl K |
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.It Fl K |
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In the blocks transferred display (-o), display block count in kilobytes rather |
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In the blocks transferred display |
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|
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.Pq Fl o , |
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display block count in kilobytes rather |
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then the device native block size. |
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then the device native block size. |
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.It Fl M |
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.It Fl M |
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Extract values associated with the name list from the specified core |
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Extract values associated with the name list from the specified core |
Lines 241-249
is specified.
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|
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Pause |
248 |
Pause |
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.Ar wait |
249 |
.Ar wait |
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seconds between each display. |
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seconds between each display. |
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If no |
251 |
If |
245 |
.Ar wait |
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.Ar wait |
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interval is specified, the default is 1 second. |
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is not specified, the default interval is 1 second. |
247 |
.Pp |
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.Pp |
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The |
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The |
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.Nm |
256 |
.Nm |
Lines 487-489
The use of
Link Here
|
487 |
as a debugging tool for crash dumps is probably limited because there is |
494 |
as a debugging tool for crash dumps is probably limited because there is |
488 |
currently no way to get statistics that only cover the time immediately before |
495 |
currently no way to get statistics that only cover the time immediately before |
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the crash. |
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the crash. |
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|
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.Pp |
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Each |
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.Ar drives |
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argument is passed to |
501 |
.Fn isdigit . |
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If |
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.Fn isdigit |
504 |
returns true, |
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.Nm |
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switches into an undocumented traditional syntax and subsequent arguments, |
507 |
if any, will not be interpreted as drive names. |
508 |
This behavior collides with the one documented in this man page and prevents |
509 |
specifying drive names starting with a number. |
510 |
E.g., the following |
511 |
.Bd -literal -offset indent |
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iostat ada0 ada1 2 3 cd0 |
513 |
.Ed |