<s>
Trilinos	B-Language
is	O
a	O
collection	O
of	O
open-source	B-Application
software	I-Application
libraries	O
,	O
called	O
packages	O
,	O
intended	O
to	O
be	O
used	O
as	O
building	O
blocks	O
for	O
the	O
development	O
of	O
scientific	O
applications	O
.	O
</s>
<s>
The	O
word	O
"	O
Trilinos	B-Language
"	O
is	O
Greek	O
and	O
conveys	O
the	O
idea	O
of	O
"	O
a	O
string	O
of	O
pearls	O
"	O
,	O
suggesting	O
a	O
number	O
of	O
software	O
packages	O
linked	O
together	O
by	O
a	O
common	O
infrastructure	O
.	O
</s>
<s>
Trilinos	B-Language
was	O
developed	O
at	O
Sandia	O
National	O
Laboratories	O
from	O
a	O
core	O
group	O
of	O
existing	O
algorithms	O
and	O
utilizes	O
the	O
functionality	O
of	O
software	O
interfaces	O
such	O
as	O
the	O
BLAS	B-Application
,	O
LAPACK	B-Application
,	O
and	O
MPI	B-Application
(	O
the	O
message-passing	O
interface	O
for	O
distributed-memory	O
parallel	O
programming	O
)	O
.	O
</s>
<s>
In	O
2004	O
,	O
Trilinos	B-Language
received	O
an	O
R&D100	O
Award	O
.	O
</s>
<s>
Several	O
supercomputing	O
facilities	O
provide	O
an	O
installed	O
version	O
of	O
Trilinos	B-Language
for	O
their	O
users	O
.	O
</s>
<s>
These	O
include	O
the	O
National	O
Energy	O
Research	O
Scientific	O
Computing	O
Center	O
(	O
NERSC	O
)	O
,	O
Blue	O
Waters	O
at	O
the	O
National	B-General_Concept
Center	I-General_Concept
for	I-General_Concept
Supercomputing	I-General_Concept
Applications	I-General_Concept
,	O
and	O
the	O
Titan	B-Device
supercomputer	I-Device
at	O
Oak	O
Ridge	O
National	O
Laboratory	O
.	O
</s>
<s>
Cray	O
supercomputers	O
come	O
with	O
Trilinos	B-Language
installed	O
as	O
part	O
of	O
the	O
Cray	O
Scientific	O
and	O
Math	O
Libraries	O
.	O
</s>
<s>
Trilinos	B-Language
contains	O
packages	O
for	O
:	O
</s>
<s>
Constructing	O
and	O
using	O
sparse	B-Algorithm
graphs	I-Algorithm
and	I-Algorithm
matrices	I-Algorithm
,	O
and	O
dense	O
matrices	O
and	O
vectors	O
.	O
</s>
<s>
Partitioning	O
and	O
load	B-Application
balancing	I-Application
of	O
distributed	O
data	O
structures	O
.	O
</s>
<s>
Trilinos	B-Language
supports	O
distributed-memory	O
parallel	O
computation	O
through	O
the	O
Message	B-Application
Passing	I-Application
Interface	I-Application
(	O
MPI	B-Application
)	O
.	O
</s>
<s>
In	O
addition	O
,	O
some	O
Trilinos	B-Language
packages	O
have	O
growing	O
support	O
for	O
shared-memory	O
parallel	O
computation	O
.	O
</s>
<s>
They	O
do	O
so	O
by	O
means	O
of	O
the	O
Kokkos	O
package	O
in	O
Trilinos	B-Language
,	O
which	O
provides	O
a	O
common	O
C++	B-Language
interface	O
over	O
various	O
parallel	O
programming	O
models	O
,	O
including	O
OpenMP	B-Application
,	O
POSIX	B-Operating_System
Threads	I-Operating_System
,	O
and	O
CUDA	B-Architecture
.	O
</s>
<s>
Most	O
Trilinos	B-Language
packages	O
are	O
written	O
in	O
C++	B-Language
.	O
</s>
<s>
Trilinos	B-Language
version	O
12.0	O
and	O
later	O
requires	O
C++11	O
support	O
.	O
</s>
<s>
Some	O
Trilinos	B-Language
packages	O
,	O
like	O
ML	O
and	O
Zoltan	O
,	O
are	O
written	O
in	O
C	B-Language
.	O
A	O
few	O
packages	O
,	O
like	O
Epetra	O
,	O
have	O
optional	O
implementations	O
of	O
some	O
computational	O
kernels	O
in	O
Fortran	B-Application
,	O
but	O
Fortran	B-Application
is	O
not	O
required	O
to	O
build	O
these	O
packages	O
.	O
</s>
<s>
Some	O
Trilinos	B-Language
packages	O
have	O
bindings	O
for	O
other	O
programming	O
languages	O
.	O
</s>
<s>
These	O
include	O
Python	O
,	O
C	B-Language
,	O
Fortran	B-Application
,	O
and	O
Matlab	O
.	O
</s>
<s>
Each	O
Trilinos	B-Language
package	O
may	O
have	O
its	O
own	O
software	O
license	O
.	O
</s>
<s>
Most	O
packages	O
are	O
Open-source	B-Application
;	O
most	O
of	O
these	O
have	O
a	O
Modified	B-Operating_System
BSD	I-Operating_System
license	I-Operating_System
,	O
while	O
a	O
few	O
packages	O
are	O
under	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
(	O
LGPL	B-Application
)	O
.	O
</s>
<s>
The	O
BLAS	B-Application
,	O
and	O
LAPACK	B-Application
libraries	O
are	O
required	O
dependencies	O
.	O
</s>
