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1 | .\" Copyright (c) 1985, 1991 The Regents of the University of California. |
2 | .\" All rights reserved. | |
3 | .\" | |
4 | .\" Redistribution and use in source and binary forms, with or without | |
5 | .\" modification, are permitted provided that the following conditions | |
6 | .\" are met: | |
7 | .\" 1. Redistributions of source code must retain the above copyright | |
8 | .\" notice, this list of conditions and the following disclaimer. | |
9 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
10 | .\" notice, this list of conditions and the following disclaimer in the | |
11 | .\" documentation and/or other materials provided with the distribution. | |
12 | .\" 3. All advertising materials mentioning features or use of this software | |
13 | .\" must display the following acknowledgement: | |
14 | .\" This product includes software developed by the University of | |
15 | .\" California, Berkeley and its contributors. | |
16 | .\" 4. Neither the name of the University nor the names of its contributors | |
17 | .\" may be used to endorse or promote products derived from this software | |
18 | .\" without specific prior written permission. | |
19 | .\" | |
20 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
21 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
22 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
23 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
24 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
25 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
26 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
27 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
28 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
29 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
30 | .\" SUCH DAMAGE. | |
31 | .\" | |
32 | .\" @(#)iostat.8 6.8 (Berkeley) 4/24/91 | |
33 | .\" | |
34 | .TH IOSTAT 8 "April 24, 1991" | |
35 | .UC 4 | |
36 | .SH NAME | |
37 | iostat \- report I/O statistics | |
38 | .SH SYNOPSIS | |
39 | .nf | |
40 | .ft B | |
41 | iostat [ \-c count ] [ \-M core ] [ \-N system ] | |
42 | .ti +5 | |
43 | [ \-w wait ] [ drives ] | |
44 | .ft R | |
45 | .fi | |
46 | .SH DESCRIPTION | |
47 | .I Iostat | |
48 | reports certain kernel statistics kept about terminal, disk and cpu | |
49 | activity. | |
50 | .PP | |
51 | The options are as follows: | |
52 | .TP | |
53 | \-c | |
54 | Repeat the display | |
55 | .I count | |
56 | times. | |
57 | The first display is for the time since a reboot and each subsequent | |
58 | report is for the time period since the last display. | |
59 | If no | |
60 | .I wait | |
61 | interval is specified, the default is 1 second. | |
62 | .TP | |
63 | \-M | |
64 | Extract values associated with the name list from the specified core | |
65 | instead of the default ``/dev/kmem''. | |
66 | .TP | |
67 | \-N | |
68 | Extract the name list from the specified system instead of the default | |
3fcd7be6 | 69 | ``/386bsd''. |
15637ed4 RG |
70 | .TP |
71 | \-w | |
72 | Pause | |
73 | .I wait | |
74 | seconds between each display. | |
75 | If no repeat | |
76 | .I count | |
77 | is specified, the default is infinity. | |
78 | .PP | |
79 | .I Iostat | |
80 | displays its information in the following format: | |
81 | .TP | |
82 | tty | |
83 | .nf | |
84 | .RS | |
85 | tin characters read from terminals | |
86 | tout characters written to terminals | |
87 | .RE | |
88 | .fi | |
89 | .TP | |
90 | disks | |
91 | Disk operations (this field is system dependent). | |
92 | The header of the field is the disk name and unit number. | |
93 | If more than four disk drives are configured in the system, | |
94 | .I iostat | |
95 | displays only the first four drives. | |
96 | To force | |
97 | .I iostat | |
98 | to display specific drives, their names may be supplied on the command | |
99 | line. | |
100 | .sp | |
101 | .nf | |
102 | .RS | |
103 | sps sectors transferred per second | |
104 | tps transfers per second | |
105 | msps milliseconds per average seek (including implied | |
106 | seeks and rotational latency) | |
107 | .RE | |
108 | .fi | |
109 | .TP | |
110 | cpu | |
111 | .nf | |
112 | .RS | |
113 | us % of cpu time in user mode | |
114 | ni % of cpu time in user mode running niced processes | |
115 | sy % of cpu time in system mode | |
116 | id % of cpu time in idle mode | |
117 | .RE | |
118 | .fi | |
119 | .SH FILES | |
120 | .ta \w'/dev/kmem 'u | |
3fcd7be6 | 121 | /386bsd default kernel namelist |
15637ed4 RG |
122 | .br |
123 | /dev/kmem default memory file | |
124 | .SH SEE ALSO | |
125 | .IR fstat (1), | |
126 | .IR netstat (1), | |
127 | .IR nfsstat (1), | |
128 | .IR ps (1), | |
129 | .IR systat (1), | |
130 | .IR vmstat (1), | |
131 | .IR pstat (8) | |
132 | .sp | |
133 | The sections starting with ``Interpreting system activity'' in | |
134 | .IR "Installing and Operating 4.3BSD" . |