HP-UX Reference (11i v1 05/09) - 1 User Commands N-Z (vol 2)

v
vmstat(1) vmstat(1)
NAME
vmstat - report virtual memory statistics
SYNOPSIS
vmstat [-dnS][interval [count]]
vmstat -f  -s 
-z
DESCRIPTION
The vmstat command reports certain statistics kept about process, virtual memory, trap, and CPU
activity. It also can clear the accumulators in the kernel
sum structure.
Options
vmstat recognizes the following options:
-d Report disk transfer information as a separate section, in the form of transfers per second.
-n Provide an output format that is more easily viewed on an 80-column display device. This
format separates the default output into two groups: virtual memory information and CPU
data. Each group is displayed as a separate line of output. On multiprocessor systems, this
display format also provides CPU utilization on a per CPU basis for the active processors.
-S Report the number of processes swapped in and out (si and so) instead of page reclaims
and address translation faults (
re and at).
interval Display successive lines which are summaries over the last interval seconds. If interval is
zero, the output is displayed once only. If the
-d option is specified, the column headers
are repeated. If -d is omitted, the column headers are not repeated.
The command vmstat 5 prints what the system is doing every five seconds. This is a
good choice of printing interval since this is how often some of the statistics are sampled in
the system; others vary every second.
count Repeat the summary statistics count times. If count is omitted or zero, the output is
repeated until an interrupt or quit signal is received. From the terminal, these are com-
monly ˆC and ˆ\, respectively (see stty(1)).
-f Report on the number of forks and the number of pages of virtual memory involved since
boot-up.
-s Print the total number of several kinds of paging-related events from the kernel
sum struc-
ture that have occurred since boot-up or since
vmstat was last executed with the -z
option.
-z Clear all accumulators in the kernel sum structure. This option is restricted to the super
user.
If none of these options is given, vmstat displays a one-line summary of the virtual memory activity since
boot-up or since the -z option was last executed.
Column Descriptions
The column headings and the meaning of each column are:
procs Information about numbers of processes in various states.
r In run queue
b Blocked for resources (I/O, paging, etc.)
w Runnable or short sleeper (< 20 secs) but swapped
memory Information about the usage of virtual and real memory. Virtual pages are considered
active if they belong to processes that are running or have run in the last 20 seconds.
avm Active virtual pages
free Size of the free list
page Information about page faults and paging activity. These are averaged each five seconds,
and given in units per second.
Section 1−−1050 Hewlett-Packard Company − 1 − HP-UX 11i Version 1: September 2005