<s>
In	O
computer	B-General_Concept
science	I-General_Concept
,	O
Cannon	B-Operating_System
's	I-Operating_System
algorithm	I-Operating_System
is	O
a	O
distributed	B-Operating_System
algorithm	I-Operating_System
for	O
matrix	O
multiplication	O
for	O
two-dimensional	O
meshes	B-Architecture
first	O
described	O
in	O
1969	O
by	O
Lynn	O
Elliot	O
Cannon	O
.	O
</s>
<s>
While	O
Cannon	B-Operating_System
's	I-Operating_System
algorithm	I-Operating_System
works	O
well	O
in	O
homogeneous	O
2D	O
grids	O
,	O
extending	O
it	O
to	O
heterogeneous	O
2D	O
grids	O
has	O
been	O
shown	O
to	O
be	O
difficult	O
.	O
</s>
<s>
It	O
is	O
used	O
by	O
the	O
ScaLAPACK	B-Application
,	O
PLAPACK	B-Application
,	O
and	O
libraries	O
.	O
</s>
<s>
This	O
means	O
that	O
all	O
three	O
matrices	O
only	O
need	O
to	O
be	O
stored	O
in	O
memory	O
once	O
evenly	O
distributed	B-Operating_System
across	O
the	O
processors	O
.	O
</s>
