<s>
OSv	B-Language
(	O
stylized	O
OSv	B-Language
)	O
is	O
a	O
cloud	B-Architecture
computing	I-Architecture
focused	O
computer	B-General_Concept
operating	I-General_Concept
system	I-General_Concept
released	O
on	O
September	O
16	O
,	O
2013	O
.	O
</s>
<s>
It	O
is	O
a	O
special-purpose	O
operating	B-General_Concept
system	I-General_Concept
built	O
to	O
run	O
as	O
a	O
guest	O
on	O
top	O
of	O
a	O
virtual	O
machine	O
,	O
thus	O
it	O
does	O
not	O
include	O
drivers	O
for	O
bare-metal	O
hardware	O
.	O
</s>
<s>
It	O
is	O
a	O
unikernel	B-Operating_System
,	O
designed	O
to	O
run	O
a	O
single	O
Linux	B-Application
executable	O
or	O
an	O
application	O
written	O
in	O
one	O
of	O
the	O
supported	O
runtime	O
environments	O
(	O
such	O
as	O
Java	B-Device
)	O
.	O
</s>
<s>
For	O
this	O
reason	O
,	O
it	O
does	O
not	O
support	O
a	O
notion	O
of	O
users	O
(	O
it	O
's	O
not	O
a	O
multiuser	O
system	O
)	O
or	O
processes	O
-	O
everything	O
runs	O
in	O
the	O
kernel	O
address	B-General_Concept
space	I-General_Concept
.	O
</s>
<s>
Using	O
a	O
single	O
address	B-General_Concept
space	I-General_Concept
removes	O
some	O
of	O
the	O
time-consuming	O
operations	O
associated	O
with	O
context	B-Operating_System
switching	I-Operating_System
.	O
</s>
<s>
It	O
uses	O
large	O
amounts	O
of	O
code	O
from	O
the	O
FreeBSD	B-Operating_System
operating	B-General_Concept
system	I-General_Concept
,	O
in	O
particular	O
the	O
network	O
stack	O
and	O
the	O
ZFS	B-Application
file	O
system	O
.	O
</s>
<s>
OSv	B-Language
can	O
be	O
managed	O
using	O
a	O
REST	O
Management	O
API	O
and	O
an	O
optional	O
command-line	O
interface	O
written	O
in	O
Lua	B-Language
.	O
</s>
