<s>
vmstat	B-Device
(	O
virtual	O
memory	O
statistics	O
)	O
is	O
a	O
computer	O
system	B-Application
monitoring	I-Application
tool	O
that	O
collects	O
and	O
displays	O
summary	O
information	O
about	O
operating	B-General_Concept
system	I-General_Concept
memory	O
,	O
processes	O
,	O
interrupts	O
,	O
paging	O
and	O
block	O
I/O	B-General_Concept
.	O
</s>
<s>
Users	O
of	O
vmstat	B-Device
can	O
specify	O
a	O
sampling	O
interval	O
which	O
permits	O
observing	O
system	O
activity	O
in	O
near-real	O
time	O
.	O
</s>
<s>
The	O
vmstat	B-Device
tool	O
is	O
available	O
on	O
most	O
Unix	B-Application
and	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
,	O
such	O
as	O
FreeBSD	B-Operating_System
,	O
Linux	B-Application
or	O
Solaris	B-Application
.	O
</s>
<s>
The	O
syntax	O
and	O
output	O
of	O
vmstat	B-Device
often	O
differs	O
slightly	O
between	O
different	O
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
We	O
can	O
get	O
the	O
customized	O
or	O
required	O
outputs	O
by	O
using	O
various	O
options	O
with	O
the	O
vmstat	B-Device
command	B-Application
.	O
</s>
