<s>
Parallel	O
Basic	B-Application
Linear	I-Application
Algebra	I-Application
Subprograms	I-Application
(	O
PBLAS	B-Operating_System
)	O
is	O
an	O
implementation	O
of	O
Level	O
2	O
and	O
3	O
BLAS	B-Application
intended	O
for	O
distributed	O
memory	O
architectures	O
.	O
</s>
<s>
It	O
provides	O
a	O
computational	O
backbone	O
for	O
ScaLAPACK	B-Application
,	O
a	O
parallel	O
implementation	O
of	O
LAPACK	B-Application
.	O
</s>
<s>
It	O
depends	O
on	O
Level	O
1	O
sequential	O
BLAS	B-Application
operations	O
for	O
local	O
computation	O
and	O
BLACS	O
for	O
communication	O
between	O
nodes	O
.	O
</s>
