<s>
The	O
Portable	B-Language
,	I-Language
Extensible	I-Language
Toolkit	I-Language
for	I-Language
Scientific	I-Language
Computation	I-Language
(	O
PETSc	B-Language
,	O
pronounced	O
PET-see	O
;	O
the	O
S	O
is	O
silent	O
)	O
,	O
is	O
a	O
suite	O
of	O
data	B-General_Concept
structures	I-General_Concept
and	O
routines	B-Application
developed	O
by	O
Argonne	O
National	O
Laboratory	O
for	O
the	O
scalable	B-Architecture
(	O
parallel	B-Operating_System
)	O
solution	O
of	O
scientific	O
applications	O
modeled	O
by	O
partial	O
differential	O
equations	O
.	O
</s>
<s>
It	O
employs	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	B-Architecture
.	O
</s>
<s>
PETSc	B-Language
is	O
the	O
world	O
’s	O
most	O
widely	O
used	O
parallel	B-Operating_System
numerical	O
software	B-Library
library	I-Library
for	O
partial	O
differential	O
equations	O
and	O
sparse	B-Algorithm
matrix	I-Algorithm
computations	O
.	O
</s>
<s>
PETSc	B-Language
received	O
an	O
R&D	O
100	O
Award	O
in	O
2009	O
.	O
</s>
<s>
The	O
PETSc	B-Language
Core	O
Development	O
Group	O
won	O
the	O
SIAM/ACM	O
Prize	O
in	O
Computational	O
Science	O
and	O
Engineering	O
for	O
2015	O
.	O
</s>
<s>
PETSc	B-Language
is	O
intended	O
for	O
use	O
in	O
large-scale	B-Architecture
application	O
projects	O
,	O
many	O
ongoing	O
computational	O
science	O
projects	O
are	O
built	O
around	O
the	O
PETSc	B-Language
libraries	B-Library
.	O
</s>
<s>
PETSc	B-Language
includes	O
a	O
large	O
suite	O
of	O
parallel	B-Operating_System
linear	B-Language
and	O
nonlinear	O
equation	O
solvers	O
that	O
are	O
easily	O
used	O
in	O
application	O
codes	O
written	O
in	O
C	B-Language
,	O
C++	B-Language
,	O
Fortran	B-Application
and	O
now	O
Python	B-Language
.	O
</s>
<s>
PETSc	B-Language
provides	O
many	O
of	O
the	O
mechanisms	O
needed	O
within	O
parallel	B-Operating_System
application	O
code	O
,	O
such	O
as	O
simple	O
parallel	B-Operating_System
matrix	B-Architecture
and	O
vector	O
assembly	O
routines	B-Application
that	O
allow	O
the	O
overlap	O
of	O
communication	B-Architecture
and	O
computation	O
.	O
</s>
<s>
In	O
addition	O
,	O
PETSc	B-Language
includes	O
support	O
for	O
parallel	B-Operating_System
distributed	O
arrays	B-Data_Structure
useful	O
for	O
finite	B-Algorithm
difference	I-Algorithm
methods	O
.	O
</s>
<s>
PETSc	B-Language
consists	O
of	O
a	O
variety	O
of	O
components	O
consisting	O
of	O
major	O
classes	O
and	O
supporting	O
infrastructure	O
.	O
</s>
<s>
All	O
major	O
components	O
of	O
PETSc	B-Language
have	O
an	O
extensible	O
plugin	O
architecture	O
.	O
</s>
<s>
PETSc	B-Language
provides	O
many	O
features	O
for	O
parallel	B-Operating_System
computation	I-Operating_System
,	O
broken	O
into	O
several	O
modules	O
:	O
</s>
<s>
Index	B-Data_Structure
sets	O
,	O
including	O
permutations	B-Algorithm
,	O
for	O
indexing	O
into	O
vectors	O
,	O
renumbering	O
,	O
etc	O
.	O
</s>
