<s>
Jaguar	B-Device
or	O
OLCF-2	B-Device
was	O
a	O
petascale	B-General_Concept
supercomputer	B-Architecture
built	O
by	O
Cray	O
at	O
Oak	O
Ridge	O
National	O
Laboratory	O
(	O
ORNL	O
)	O
in	O
Oak	O
Ridge	O
,	O
Tennessee	O
.	O
</s>
<s>
The	O
massively	B-Operating_System
parallel	I-Operating_System
Jaguar	B-Device
had	O
a	O
peak	O
performance	O
of	O
just	O
over	O
1,750	O
teraFLOPS	O
(	O
1.75	O
petaFLOPS	O
)	O
.	O
</s>
<s>
It	O
had	O
224,256	O
x86-based	O
AMD	B-General_Concept
Opteron	I-General_Concept
processor	O
cores	O
,	O
and	O
operated	O
with	O
a	O
version	O
of	O
Linux	B-Application
called	O
the	O
Cray	O
Linux	B-Application
Environment	O
.	O
</s>
<s>
Jaguar	B-Device
was	O
a	O
Cray	B-Device
XT5	I-Device
system	O
,	O
a	O
development	O
from	O
the	O
Cray	B-Device
XT4	I-Device
supercomputer	B-Architecture
.	O
</s>
<s>
In	O
both	O
November	O
2009	O
and	O
June	O
2010	O
,	O
TOP500	B-Operating_System
,	O
the	O
semiannual	O
list	O
of	O
the	O
world	O
's	O
top	B-Operating_System
500	I-Operating_System
supercomputers	I-Operating_System
,	O
named	O
Jaguar	B-Device
as	O
the	O
world	O
's	O
fastest	B-Operating_System
computer	I-Operating_System
.	O
</s>
<s>
In	O
late	O
October	O
2010	O
,	O
the	O
BBC	O
reported	O
that	O
the	O
Chinese	O
supercomputer	B-Architecture
Tianhe-1A	B-Device
had	O
taken	O
over	O
the	O
top	O
spot	O
,	O
achieving	O
over	O
2.5	O
quadrillion	O
calculations	O
per	O
second	O
,	O
thereby	O
bumping	O
Jaguar	B-Device
to	O
second	O
place	O
.	O
</s>
<s>
The	O
November	O
2010	O
TOP500	B-Operating_System
list	O
confirmed	O
the	O
new	O
rankings	O
.	O
</s>
<s>
In	O
2012	O
,	O
the	O
Cray	B-Device
XT5	I-Device
Jaguar	B-Device
was	O
upgraded	O
to	O
the	O
Cray	O
XK7	O
Titan	B-Device
hybrid	O
supercomputing	B-Architecture
system	O
by	O
adding	O
the	O
Gemini	O
network	O
interconnect	O
and	O
fitting	O
all	O
of	O
the	O
compute	O
nodes	O
with	O
Kepler	B-General_Concept
generation	O
Nvidia	O
GPUs	B-Architecture
.	O
</s>
<s>
The	O
Jaguar	B-Device
system	O
has	O
been	O
through	O
a	O
series	O
of	O
upgrades	O
since	O
installation	O
as	O
a	O
25-teraFLOPS	O
Cray	O
XT3	O
in	O
2005	O
.	O
</s>
<s>
By	O
early	O
2008	O
,	O
Jaguar	B-Device
was	O
a	O
263-teraFLOPS	O
Cray	B-Device
XT4	I-Device
.	O
</s>
<s>
In	O
2008	O
,	O
Jaguar	B-Device
was	O
expanded	O
with	O
the	O
addition	O
of	O
a	O
1.4-petaFLOPS	O
Cray	B-Device
XT5	I-Device
.	O
</s>
<s>
The	O
XT4	B-Device
and	O
XT5	B-Device
parts	O
of	O
Jaguar	B-Device
are	O
combined	O
into	O
a	O
single	O
system	O
using	O
an	O
InfiniBand	B-Architecture
network	O
that	O
links	O
each	O
piece	O
to	O
the	O
Spider	O
file	O
system	O
.	O
</s>
<s>
Jaguar	B-Device
's	O
XT5	B-Device
partition	O
contains	O
18,688	O
compute	O
nodes	O
in	O
addition	O
to	O
dedicated	O
login/service	O
nodes	O
.	O
</s>
<s>
Each	O
XT5	B-Device
compute	O
node	O
contains	O
dual	O
hex-core	O
AMD	B-General_Concept
Opteron	I-General_Concept
2435	O
(	O
Istanbul	O
)	O
processors	O
and	O
16	O
GiB	O
of	O
memory	O
.	O
</s>
<s>
Jaguar	B-Device
's	O
XT4	B-Device
partition	O
contains	O
7,832	O
compute	O
nodes	O
in	O
addition	O
to	O
dedicated	O
login/service	O
nodes	O
.	O
</s>
<s>
Each	O
XT4	B-Device
compute	O
node	O
contains	O
a	O
quad-core	O
AMD	B-General_Concept
Opteron	I-General_Concept
1354	O
(	O
Budapest	O
)	O
processor	O
and	O
8	O
GiB	O
of	O
memory	O
.	O
</s>
<s>
Jaguar	B-Device
uses	O
an	O
external	O
Lustre	B-Application
file	I-Application
system	I-Application
called	O
Spider	O
for	O
all	O
file	O
storage	O
.	O
</s>
<s>
The	O
petaFLOPS	O
Jaguar	B-Device
seeks	O
to	O
address	O
some	O
of	O
the	O
most	O
challenging	O
scientific	O
problems	O
in	O
areas	O
such	O
as	O
climate	B-Application
modeling	I-Application
,	O
renewable	O
energy	O
,	O
materials	O
science	O
,	O
seismology	O
,	O
chemistry	O
,	O
astrophysics	O
,	O
fusion	O
,	O
and	O
combustion	O
.	O
</s>
<s>
Annually	O
,	O
80	O
percent	O
of	O
Jaguar	B-Device
's	O
resources	O
are	O
allocated	O
through	O
DOE	O
's	O
Innovative	O
and	O
Novel	O
Computational	O
Impact	O
on	O
Theory	O
and	O
Experiment	O
(	O
INCITE	O
)	O
program	O
,	O
a	O
competitively	O
selected	O
,	O
peer-reviewed	O
process	O
open	O
to	O
researchers	O
from	O
universities	O
,	O
industry	O
,	O
government	O
,	O
and	O
non-profit	O
organizations	O
.	O
</s>
