<s>
mod_ruby	O
is	O
a	O
module	O
that	O
embeds	O
the	O
Ruby	B-Language
interpreter	B-Application
into	O
the	O
Apache	B-Application
web	I-Application
server	I-Application
to	O
allow	O
Ruby	B-Language
code	O
to	O
execute	O
natively	O
,	O
faster	O
than	O
other	O
CGI	B-Language
methods	O
.	O
</s>
<s>
Its	O
drawback	O
is	O
that	O
the	O
characteristic	O
sharing	O
of	O
classes	O
among	O
Apache	B-Application
processes	O
is	O
not	O
safe	O
for	O
multiple	O
applications	O
(	O
e.g.	O
,	O
multiple	O
Ruby	B-Application
on	I-Application
Rails	I-Application
applications	O
running	O
simultaneously	O
)	O
.	O
</s>
<s>
There	O
is	O
also	O
the	O
similar	O
for	O
mruby	B-Application
,	O
a	O
lightweight	O
Ruby	B-Language
implementation	O
.	O
</s>
