<s>
Scalasca	B-Application
is	O
a	O
free	B-License
and	I-License
open-source	I-License
software	I-License
for	O
measurement	O
,	O
analysis	O
,	O
and	O
optimization	O
of	O
parallel	B-Operating_System
program	I-Operating_System
performance	O
.	O
</s>
<s>
It	O
is	O
licensed	O
under	O
the	O
BSD-style	B-Operating_System
license	I-Operating_System
.	O
</s>
<s>
Scalasca	B-Application
is	O
mostly	O
used	O
for	O
profiling	O
scientific	O
and	O
engineering	O
applications	O
using	O
OpenMP	B-Application
and/or	O
MPI	B-Application
.	O
</s>
<s>
It	O
supports	O
runtime	O
analysis	O
on	O
supercomputers	B-Architecture
.	O
</s>
<s>
The	O
application	O
being	O
analysed	O
needs	O
first	O
of	O
all	O
to	O
be	O
"	O
instrumented	O
"	O
:	O
MPI	B-Application
usage	O
is	O
instrumented	O
simply	O
by	O
linking	O
the	O
application	O
to	O
the	O
measuring	O
library	O
,	O
while	O
OpenMP	B-Application
usage	O
is	O
instrumented	O
by	O
recompiling	O
from	O
source	O
using	O
Scalasca	B-Application
's	O
modified	O
compiler	B-Language
.	O
</s>
