Sun Microsystems Sun Workstation 100U System Manager's Manual page 268

VMSTAT(8)
MAINTENANCE COMMANDS VMSTAT(8)
NAME
vms tat - report virtual memory statistics
SYNOPSIS
vmltat ( -tiS) (
interval ( count) )
DESCRIPTION
Vm,'tJt delves into the system and normally reports certain statistics kept about process, virtual
memory, disk, trap and cpu activity.
Without options, vmsldl displays a one-line summary or the virtual memory activity since the sys-
tem haa been booted. It interval is specified, vm,tat summarizes activity over the last interval
seconds. It a count is given, the statistics are repeated count times.
For example, the following command displays a summary or what the system is doing every five
seconds. This is a good choice or printing interval since this is how often some of the statistics
are sampled in the system.
hal%
vmltat
5
procs
r b w
200
100
100
100
AC
hal%
memory
avm fre
918 286
846 254
840 268
620 312
re at pi
o
0 0
o
0 0
o
0 0
o
0 0
The fields of vmstal's display are:
page
disk faults cpu
po fr de sr xO xl x2 x3 in sy cs us sy id
0 0 0 010 0 0 4 12 5 3 5 91
0 0 0 060 1 0 42 153 31 7 40 54
0 0 0 050 0 0 27 103 25 8 26 66
0 0 0
060 0 0 26 76 25 6 27 67
procs Reports the number of processes in each of the three following states:
r in rUD queue
b blocked for resources (i/o, paging, etc.)
w runnable or short sleeper
«
20 secs) but swapped
memory Reports on usage or virtual and real memory. Virtual memory is considered active it it
belongs to processes which are running or have run in the last
20
seconds.
avm number or active virtual Kbytes
ere size or the free list in Kbytes
page Reports information about page faults and paging activity. The information on each of
the rollowing activities is averaged each five seconds, and given in units per second.
re page reclaims (simulating reference bits) - but see the -S option for how this
field is modified.
at number of attaches - but see the -S option for how this field is modified.
pi pages paged in
po pages paged ou t
fr pages freed per second
de anticipated short term memory shortCall
sr pages scanned by clock algorithm, per-second
disk Reports number of disk operations per second (this field is system dependent). For Sun
systems, tour slots are available for up to four drives: "xO" (or "sO" tor SCSI disks),
"xl", "x2", and "x3".
faults Reports trap/interrupt rate averages per second over last 5 seconds.
in (non clock) device interrupts per second
8y system calls per second
cs cpu context switch rate (switches/sec)
Sun
Rele~
1.1
Last change: 16 February 1984
113