<s>
Kerrighed	B-Operating_System
is	O
an	O
open	B-License
source	I-License
single-system	B-Operating_System
image	I-Operating_System
(	O
SSI	O
)	O
cluster	B-Architecture
software	O
project	O
.	O
</s>
<s>
In	O
January	O
,	O
2012	O
the	O
Linux	B-Application
clustering	O
mission	O
of	O
Kerlabs	O
was	O
adopted	O
by	O
a	O
new	O
company	O
:	O
We	O
Cluster	B-Architecture
,	O
Inc	O
.	O
headquartered	O
in	O
Pacific	O
Grove	O
,	O
California	O
.	O
</s>
<s>
January	O
18	O
,	O
2012	O
:	O
Kerrighed	B-Operating_System
3.0	O
has	O
been	O
ported	O
to	O
Ubuntu	O
12.04	O
with	O
Linux	B-Application
Kernel	O
v3.2	O
.	O
</s>
<s>
Kerrighed	B-Operating_System
is	O
implemented	O
as	O
an	O
extension	O
to	O
the	O
Linux	B-Application
operating	I-Application
system	I-Application
.	O
</s>
<s>
Such	O
applications	O
may	O
be	O
using	O
OpenMP	B-Application
,	O
Message	B-Application
Passing	I-Application
Interface	I-Application
,	O
and/or	O
a	O
Posix	B-Operating_System
multithreaded	I-Operating_System
programming	O
model	O
.	O
</s>
<s>
Kerrighed	B-Operating_System
implements	O
a	O
set	O
of	O
global	O
resource	O
management	O
services	O
that	O
aim	O
at	O
making	O
resource	O
distribution	O
transparent	O
to	O
the	O
applications	O
,	O
at	O
managing	O
resource	O
sharing	O
in	O
and	O
between	O
applications	O
and	O
at	O
taking	O
benefit	O
of	O
the	O
whole	O
cluster	B-Architecture
resources	O
for	O
demanding	O
applications	O
.	O
</s>
<s>
Kerrighed	B-Operating_System
provides	O
a	O
development	O
framework	O
allowing	O
to	O
easily	O
implement	O
dynamic	O
scheduling	O
policies	O
without	O
kernel	O
modification	O
.	O
</s>
<s>
Kerrighed	B-Operating_System
provides	O
several	O
features	O
such	O
as	O
a	O
distributed	B-Operating_System
shared	I-Operating_System
memory	I-Operating_System
with	O
a	O
sequential	B-General_Concept
consistency	I-General_Concept
model	O
,	O
processes	O
migration	O
from	O
one	O
cluster	B-Architecture
node	O
to	O
another	O
,	O
and	O
to	O
a	O
limited	O
extent	O
checkpointing	B-General_Concept
.	O
</s>
<s>
Kerrighed	B-Operating_System
introduces	O
a	O
container	O
concept	O
:	O
this	O
entity	O
is	O
an	O
abstraction	O
of	O
both	O
files	O
and	O
memory	O
.	O
</s>
<s>
Each	O
Kerrighed	B-Operating_System
node	O
starts	O
a	O
'	O
root	O
 '	O
container	O
in	O
which	O
only	O
local	O
resources	O
are	O
available	O
.	O
</s>
<s>
the	O
Kerrighed	B-Operating_System
container	O
.	O
</s>
