<s>
Cielo	B-Device
was	O
a	O
United	O
States	O
supercomputer	B-Architecture
located	O
at	O
Los	O
Alamos	O
National	O
Laboratory	O
.	O
</s>
<s>
Built	O
by	O
Cray	O
Inc	O
,	O
the	O
computer	O
was	O
part	O
of	O
the	O
Advanced	B-General_Concept
Simulation	I-General_Concept
and	I-General_Concept
Computing	I-General_Concept
Program	I-General_Concept
to	O
maintain	O
the	O
United	O
States	O
nuclear	O
stockpile	O
.	O
</s>
<s>
From	O
31	O
March	O
2013	O
,	O
with	O
the	O
retirement	O
of	O
IBM	B-General_Concept
Roadrunner	I-General_Concept
,	O
it	O
took	O
over	O
as	O
their	O
front	O
line	O
computer	O
.	O
</s>
<s>
,	O
it	O
is	O
ranked	O
as	O
number	O
32	O
on	O
the	O
TOP500	B-Operating_System
.	O
</s>
