<s>
A	O
multikernel	B-Operating_System
operating	B-General_Concept
system	I-General_Concept
treats	O
a	O
multi-core	B-Architecture
machine	O
as	O
a	O
network	O
of	O
independent	O
cores	O
,	O
as	O
if	O
it	O
were	O
a	O
distributed	B-Architecture
system	I-Architecture
.	O
</s>
<s>
It	O
does	O
not	O
assume	O
shared	O
memory	O
but	O
rather	O
implements	O
inter-process	O
communications	O
as	O
message-passing	B-Architecture
.	O
</s>
<s>
Barrelfish	B-Operating_System
was	O
the	O
first	O
operating	B-General_Concept
system	I-General_Concept
to	O
be	O
described	O
as	O
a	O
multikernel	B-Operating_System
.	O
</s>
