<s>
Matz	B-Language
's	I-Language
Ruby	I-Language
Interpreter	I-Language
or	O
Ruby	B-Language
MRI	I-Language
(	O
also	O
called	O
CRuby	B-Language
)	O
was	O
the	O
reference	O
implementation	O
of	O
the	O
Ruby	B-Language
programming	I-Language
language	I-Language
named	O
after	O
Ruby	B-Language
creator	O
Yukihiro	O
Matsumoto	O
(	O
"	O
Matz	O
"	O
)	O
.	O
</s>
<s>
Until	O
the	O
specification	O
of	O
the	O
Ruby	B-Language
language	I-Language
in	O
2012	O
,	O
the	O
MRI	O
implementation	O
was	O
considered	O
the	O
de	O
facto	O
reference	O
,	O
especially	O
since	O
an	O
independent	O
attempt	O
to	O
create	O
the	O
specification	O
(	O
RubySpec	B-Language
)	O
had	O
failed	O
.	O
</s>
<s>
Starting	O
with	O
Ruby	B-Language
1.9	O
,	O
and	O
continuing	O
with	O
Ruby	B-Language
2.x	O
and	O
above	O
,	O
the	O
official	O
Ruby	B-Language
interpreter	O
has	O
been	O
YARV	B-Language
(	O
"	O
Yet	O
Another	O
Ruby	B-Language
VM	O
"	O
)	O
.	O
</s>
<s>
Yukihiro	O
Matsumoto	O
(	O
"	O
Matz	O
"	O
)	O
started	O
working	O
on	O
Ruby	B-Language
on	O
February	O
24	O
,	O
1993	O
,	O
and	O
released	O
it	O
to	O
the	O
public	O
in	O
1995	O
.	O
</s>
<s>
"	O
Ruby	B-Language
"	O
was	O
named	O
as	O
a	O
gemstone	O
because	O
of	O
a	O
joke	O
within	O
Matsumoto	O
's	O
circle	O
of	O
friends	O
alluding	O
to	O
the	O
name	O
of	O
the	O
Perl	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
This	O
version	O
provides	O
bug	O
fixes	O
,	O
but	O
also	O
many	O
Ruby	B-Language
feature	O
enhancements	O
.	O
</s>
<s>
The	O
RubySpec	B-Language
project	O
has	O
independently	O
created	O
a	O
large	O
test	O
suite	O
that	O
captures	O
1.8.6/1.8.7/1.9	O
behavior	O
as	O
a	O
reference	O
conformance	O
tool	O
.	O
</s>
<s>
Ruby	B-Language
MRI	I-Language
1.9.2	O
passed	O
over	O
99%	O
of	O
RubySpec.	O
,	O
MRI	O
Ruby	B-Language
2.2	O
crashed	O
on	O
one	O
of	O
the	O
tests	O
.	O
</s>
<s>
As	O
a	O
result	O
of	O
the	O
limited	O
uptake	O
by	O
the	O
MRI	O
developers	O
,	O
RubySpec	B-Language
project	O
has	O
been	O
discontinued	O
as	O
of	O
end	O
of	O
2014	O
.	O
</s>
<s>
Prior	O
to	O
release	O
1.9.3	O
,	O
the	O
Ruby	B-Language
interpreter	O
and	O
libraries	O
were	O
distributed	O
as	O
dual-licensed	B-License
free	B-Application
and	I-Application
open	I-Application
source	I-Application
software	I-Application
,	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
or	O
the	O
Ruby	B-License
License	I-License
.	O
</s>
<s>
In	O
release	O
1.9.3	O
,	O
Ruby	B-Language
's	O
License	O
has	O
been	O
changed	O
from	O
a	O
dual	B-License
license	I-License
with	O
GPLv2	O
to	O
a	O
dual	B-License
license	I-License
with	O
the	O
2-clause	B-Operating_System
BSD	I-Operating_System
license	I-Operating_System
.	O
</s>
<s>
Ruby	B-Language
MRI	I-Language
is	O
available	O
for	O
the	O
following	O
operating	B-General_Concept
systems	I-General_Concept
(	O
supported	O
Ruby	B-Language
versions	O
can	O
be	O
different	O
)	O
:	O
</s>
<s>
PowerPC64	B-General_Concept
performance	O
Since	O
version	O
2.2.1	O
,	O
Ruby	B-Language
MRI	I-Language
performance	O
on	O
PowerPC64	B-General_Concept
was	O
improved	O
.	O
</s>
<s>
The	O
release	O
of	O
Ruby	B-Language
2.0	O
sought	O
to	O
avoid	O
such	O
a	O
conflict	O
between	O
different	O
versions	O
.	O
</s>
<s>
Threaded	O
programs	O
cannot	O
use	O
more	O
than	O
a	O
single	O
CPU	O
core	O
due	O
to	O
the	O
Global	B-Operating_System
interpreter	I-Operating_System
lock	I-Operating_System
.	O
</s>
