<s>
Open	B-Library
MPI	I-Library
is	O
a	O
Message	B-Application
Passing	I-Application
Interface	I-Application
(	O
MPI	O
)	O
library	B-Library
project	O
combining	O
technologies	O
and	O
resources	O
from	O
several	O
other	O
projects	O
(	O
FT-MPI	O
,	O
LA-MPI	O
,	O
LAM/MPI	B-Operating_System
,	O
and	O
PACX-MPI	O
)	O
.	O
</s>
<s>
It	O
is	O
used	O
by	O
many	O
TOP500	B-Operating_System
supercomputers	B-Architecture
including	O
Roadrunner	B-General_Concept
,	O
which	O
was	O
the	O
world	O
's	O
fastest	B-Operating_System
supercomputer	I-Operating_System
from	O
June	O
2008	O
to	O
November	O
2009	O
,	O
and	O
K	B-Device
computer	I-Device
,	O
the	O
fastest	B-Operating_System
supercomputer	I-Operating_System
from	O
June	O
2011	O
to	O
June	O
2012	O
.	O
</s>
<s>
Open	B-Library
MPI	I-Library
represents	O
the	O
merger	O
between	O
three	O
well-known	O
MPI	O
implementations	O
:	O
</s>
<s>
These	O
four	O
institutions	O
comprise	O
the	O
founding	O
members	O
of	O
the	O
Open	B-Library
MPI	I-Library
development	O
team	O
.	O
</s>
<s>
The	O
Open	B-Library
MPI	I-Library
developers	O
selected	O
these	O
MPI	O
implementations	O
as	O
excelling	O
in	O
one	O
or	O
more	O
areas	O
.	O
</s>
<s>
Open	B-Library
MPI	I-Library
aims	O
to	O
use	O
the	O
best	O
ideas	O
and	O
technologies	O
from	O
the	O
individual	O
projects	O
and	O
create	O
one	O
world-class	O
open-source	B-Application
MPI	O
implementation	O
that	O
excels	O
in	O
all	O
areas	O
.	O
</s>
<s>
The	O
Open	B-Library
MPI	I-Library
project	O
specifies	O
several	O
top-level	O
goals	O
:	O
</s>
<s>
to	O
involve	O
the	O
high-performance	B-Architecture
computing	I-Architecture
community	O
directly	O
with	O
external	O
development	O
and	O
feedback	O
(	O
vendors	O
,	O
3rd	O
party	O
researchers	O
,	O
users	O
,	O
etc	O
.	O
)	O
</s>
<s>
The	O
Open	B-Library
MPI	I-Library
code	O
has	O
3	O
major	O
code	O
modules	O
:	O
</s>
<s>
Open	B-Library
MPI	I-Library
development	O
is	O
performed	O
within	O
a	O
consortium	O
of	O
many	O
industrial	O
and	O
academic	O
partners	O
.	O
</s>
<s>
The	O
consortium	O
also	O
covers	O
several	O
other	O
software	O
projects	O
such	O
as	O
the	O
hwloc	O
(	O
Hardware	O
Locality	O
)	O
library	B-Library
which	O
takes	O
care	O
of	O
discovering	O
and	O
modeling	O
the	O
topology	O
of	O
parallel	O
platforms	O
.	O
</s>
