<s>
Stanford	B-Operating_System
DASH	I-Operating_System
was	O
a	O
cache	B-General_Concept
coherent	I-General_Concept
multiprocessor	B-Operating_System
developed	O
in	O
the	O
late	O
1980s	O
by	O
a	O
group	O
led	O
by	O
Anoop	O
Gupta	O
,	O
John	O
L	O
.	O
Hennessy	O
,	O
Mark	O
Horowitz	O
,	O
and	O
Monica	O
S	O
.	O
Lam	O
at	O
Stanford	O
University	O
.	O
</s>
<s>
The	O
boards	O
designed	O
at	O
Stanford	O
implemented	O
a	O
directory-based	O
cache	B-General_Concept
coherence	I-General_Concept
protocol	O
allowing	O
Stanford	B-Operating_System
DASH	I-Operating_System
to	O
support	O
distributed	B-Operating_System
shared	I-Operating_System
memory	I-Operating_System
for	O
up	O
to	O
64	O
processors	O
.	O
</s>
<s>
Stanford	B-Operating_System
DASH	I-Operating_System
was	O
also	O
notable	O
for	O
both	O
supporting	O
and	O
helping	O
to	O
formalize	O
weak	O
memory	B-General_Concept
consistency	I-General_Concept
models	I-General_Concept
,	O
including	O
release	B-General_Concept
consistency	I-General_Concept
.	O
</s>
<s>
Because	O
Stanford	B-Operating_System
DASH	I-Operating_System
was	O
the	O
first	O
operational	O
machine	O
to	O
include	O
scalable	O
cache	B-General_Concept
coherence	I-General_Concept
,	O
it	O
influenced	O
subsequent	O
computer	O
science	O
research	O
as	O
well	O
as	O
the	O
commercially	O
available	O
SGI	B-Application
Origin	I-Application
2000	I-Application
.	O
</s>
<s>
Stanford	B-Operating_System
DASH	I-Operating_System
is	O
included	O
in	O
the	O
25th	O
anniversary	O
retrospective	O
of	O
selected	O
papers	O
from	O
the	O
International	O
Symposium	O
on	O
Computer	O
Architecture	O
and	O
several	O
computer	O
science	O
books	O
,	O
has	O
been	O
simulated	O
by	O
the	O
University	O
of	O
Edinburgh	O
,	O
and	O
is	O
used	O
as	O
a	O
case	O
study	O
in	O
contemporary	O
computer	O
science	O
classes	O
.	O
</s>
