<s>
The	O
Parallel	B-Operating_System
High	O
Performance	O
Preconditioners	O
(	O
hypre	B-Library
)	O
is	O
a	O
library	O
of	O
routines	B-Application
for	O
scalable	B-Architecture
(	O
parallel	B-Operating_System
)	O
solution	O
of	O
linear	O
systems	O
.	O
</s>
<s>
The	O
main	O
strength	O
of	O
Hypre	B-Library
is	O
availability	O
of	O
high	O
performance	O
parallel	B-Operating_System
multigrid	O
preconditioners	O
for	O
both	O
structured	O
and	O
unstructured	O
grid	O
problems	O
.	O
</s>
<s>
Currently	O
,	O
Hypre	B-Library
supports	O
only	O
real	O
double-precision	O
arithmetic	O
.	O
</s>
<s>
Hypre	B-Library
uses	O
the	O
Message	B-Application
Passing	I-Application
Interface	I-Application
(	O
MPI	O
)	O
standard	O
for	O
all	O
message-passing	O
communication	O
.	O
</s>
<s>
PETSc	B-Language
has	O
an	O
interface	O
to	O
call	O
Hypre	B-Library
preconditioners	O
.	O
</s>
<s>
Hypre	B-Library
is	O
being	O
developed	O
and	O
is	O
supported	O
by	O
members	O
of	O
the	O
Scalable	B-Architecture
Linear	O
Solvers	O
project	O
within	O
the	O
Lawrence	O
Livermore	O
National	O
Laboratory	O
.	O
</s>
<s>
hypre	B-Library
provides	O
the	O
following	O
features	O
:	O
</s>
