<s>
In	O
scientific	O
computing	O
,	O
GotoBLAS	B-Application
and	O
GotoBLAS2	O
are	O
open	B-Application
source	I-Application
implementations	O
of	O
the	O
BLAS	B-Application
(	O
Basic	B-Application
Linear	I-Application
Algebra	I-Application
Subprograms	I-Application
)	O
API	B-Application
with	O
many	O
hand-crafted	O
optimizations	O
for	O
specific	O
processor	B-General_Concept
types	O
.	O
</s>
<s>
GotoBLAS	B-Application
was	O
developed	O
by	O
Kazushige	O
Goto	O
at	O
the	O
Texas	O
Advanced	O
Computing	O
Center	O
.	O
</s>
<s>
,	O
it	O
was	O
used	O
in	O
seven	O
of	O
the	O
world	O
's	O
ten	O
fastest	O
supercomputers	B-Architecture
.	O
</s>
<s>
GotoBLAS	B-Application
remains	O
available	O
,	O
but	O
development	O
ceased	O
with	O
a	O
final	O
version	O
touting	O
optimal	O
performance	O
on	O
Intel	O
's	O
Nehalem	B-Device
architecture	O
(	O
contemporary	O
in	O
2008	O
)	O
.	O
</s>
<s>
OpenBLAS	B-Application
is	O
an	O
actively	O
maintained	O
fork	O
of	O
GotoBLAS	B-Application
,	O
developed	O
at	O
the	O
Lab	O
of	O
Parallel	O
Software	O
and	O
Computational	O
Science	O
,	O
ISCAS	O
.	O
</s>
<s>
GotoBLAS	B-Application
was	O
written	O
by	O
Goto	O
during	O
his	O
sabbatical	O
leave	O
from	O
the	O
Japan	O
Patent	O
Office	O
in	O
2002	O
.	O
</s>
<s>
It	O
was	O
initially	O
optimized	O
for	O
the	O
Pentium	B-General_Concept
4	I-General_Concept
processor	B-General_Concept
and	O
managed	O
to	O
immediately	O
boost	O
the	O
performance	O
of	O
a	O
supercomputer	B-Architecture
based	O
on	O
that	O
CPU	O
from	O
1.5	O
TFLOPS	O
to	O
2	O
TFLOPS	O
.	O
</s>
<s>
A	O
later	O
open	B-Application
source	I-Application
version	O
was	O
released	O
under	O
the	O
terms	O
of	O
the	O
BSD	B-Operating_System
license	I-Operating_System
.	O
</s>
<s>
GotoBLAS	B-Application
's	O
matrix-matrix	O
multiplication	O
routine	O
,	O
called	O
GEMM	O
in	O
BLAS	B-Application
terms	O
,	O
is	O
highly	O
tuned	O
for	O
the	O
x86	B-Operating_System
and	O
AMD64	B-Device
processor	B-General_Concept
architectures	O
by	O
means	O
of	O
handcrafted	O
assembly	B-Language
code	I-Language
.	O
</s>
<s>
It	O
follows	O
a	O
similar	O
decomposition	O
into	O
smaller	O
"	O
kernel	O
"	O
routines	O
that	O
other	O
BLAS	B-Application
implementations	O
use	O
,	O
but	O
where	O
earlier	O
implementations	O
streamed	O
data	O
from	O
the	O
L1	B-General_Concept
processor	I-General_Concept
cache	I-General_Concept
,	O
GotoBLAS	B-Application
uses	O
the	O
L2	O
cache	O
.	O
</s>
<s>
Several	O
other	O
BLAS	B-Application
routines	O
are	O
,	O
as	O
is	O
customary	O
in	O
BLAS	B-Application
libraries	O
,	O
implemented	O
in	O
terms	O
of	O
GEMM	O
.	O
</s>
