<s>
Nimrod	B-Operating_System
is	O
a	O
tool	O
for	O
the	O
parametrization	O
of	O
serial	O
programs	O
to	O
create	O
and	O
execute	O
embarrassingly	B-Operating_System
parallel	I-Operating_System
programs	O
over	O
a	O
computational	B-Architecture
grid	I-Architecture
.	O
</s>
<s>
Nimrod	B-Operating_System
was	O
one	O
of	O
the	O
first	O
tools	O
to	O
make	O
use	O
of	O
heterogeneous	O
resources	O
in	O
a	O
grid	O
for	O
a	O
single	O
computation	O
.	O
</s>
<s>
This	O
enables	O
Nimrod	B-Operating_System
to	O
provide	O
a	O
guaranteed	O
completion	O
time	O
despite	O
using	O
best-effort	O
services	O
.	O
</s>
