<s>
Tornado	B-Language
is	O
a	O
scalable	O
,	O
non-blocking	B-Architecture
web	B-Application
server	I-Application
and	O
web	B-Application
application	I-Application
framework	I-Application
written	O
in	O
Python	B-Language
.	O
</s>
<s>
It	O
was	O
developed	O
for	O
use	O
by	O
FriendFeed	O
;	O
the	O
company	O
was	O
acquired	O
by	O
Facebook	O
in	O
2009	O
and	O
Tornado	B-Language
was	O
open-sourced	O
soon	O
after	O
.	O
</s>
<s>
Tornado	B-Language
is	O
noted	O
for	O
its	O
high	O
performance	O
.	O
</s>
<s>
Its	O
design	O
enables	O
handling	O
a	O
large	O
number	O
of	O
concurrent	O
connections	O
(	O
i.e.	O
,	O
tries	O
to	O
solve	O
the	O
"	O
C10k	B-Protocol
problem	I-Protocol
"	O
)	O
.	O
</s>
<s>
An	O
asynchronous	O
MongoDB	B-Application
driver	O
called	O
Motor	O
.	O
</s>
<s>
CouchDB	B-Application
drivers	O
called	O
corduroy	O
and	O
trombi	O
.	O
</s>
