Penguin
Recent Changes
Annotated edit history of vmstat(8) version 1, including all changes. View license author blame.
Rev Author # Line
1 perry 1 VMSTAT
2 !!!VMSTAT
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 FIELD DESCRIPTIONS
7 NOTES
8 FILES
9 SEE ALSO
10 BUGS
11 AUTHOR
12 ----
13 !!NAME
14
15
16 vmstat - Report virtual memory statistics
17 !!SYNOPSIS
18
19
20 __vmstat__ [[__-n__] [[''delay'' [[
21 ''count'']]__
22 vmstat__[[__-V__]
23 !!DESCRIPTION
24
25
26 __vmstat__ reports information about processes, memory,
27 paging, block IO, traps, and cpu activity.
28
29
30 The first report produced gives averages since the last
31 reboot. Additional reports give information on a sampling
32 period of length ''delay''. The process and memory
33 reports are instantaneous in either case.
34
35
36 __Options__
37
38
39 The __-n__ switch causes the header to be displayed only
40 once rather than periodically.
41
42
43 ''delay'' is the delay between updates in seconds. If no
44 delay is specified, only one report is printed with the
45 average values since boot.
46
47
48 ''count'' is the number of updates. If no count is
49 specified and delay is defined, ''count'' defaults to
50 infinity.
51
52
53 The __-V__ switch results in displaying version
54 information.
55 !!FIELD DESCRIPTIONS
56
57
58 __Procs__
59
60
61 r: The number of processes waiting for run time.
62 b: The number of processes in uninterruptable sleep.
63 w: The number of processes swapped out but otherwise runnable. This
64 field is calculated, but Linux never desperation swaps.
65
66
67 __Memory__
68
69
70 swpd: the amount of virtual memory used (kB).
71 free: the amount of idle memory (kB).
72 buff: the amount of memory used as buffers (kB).
73
74
75 __Swap__
76
77
78 si: Amount of memory swapped in from disk (kB/s).
79 so: Amount of memory swapped to disk (kB/s).
80
81
82 __IO__
83
84
85 bi: Blocks sent to a block device (blocks/s).
86 bo: Blocks received from a block device (blocks/s).
87
88
89 __System__
90
91
92 in: The number of interrupts per second, including the clock.
93 cs: The number of context switches per second.
94
95
96 __CPU__
97
98
99 These are percentages of total CPU time.
100
101
102 us: user time
103 sy: system time
104 id: idle time
105 !!NOTES
106
107
108 __vmstat__ does not require special
109 permissions.
110
111
112 These reports are intended to help identify system
113 bottlenecks. Linux __vmstat__ does not count itself as a
114 running process.
115
116
117 All linux blocks are currently 1k, except for CD-ROM blocks
118 which are 2k.
119 !!FILES
120
121
122 /proc/meminfo
123 /proc/stat
124 /proc/*/stat
125 !!SEE ALSO
126
127
128 ps(1), top(1), free(1)
129 !!BUGS
130
131
132 Does not tabulate the block io per device or count the
133 number of system calls.
134 !!AUTHOR
135
136
137 Written by Henry Ware
138 ----
This page is a man page (or other imported legacy content). We are unable to automatically determine the license status of this page.