<s>
Alewife	B-Operating_System
was	O
a	O
cache	B-General_Concept
coherent	I-General_Concept
multiprocessor	B-Operating_System
developed	O
in	O
the	O
early	O
1990s	O
by	O
a	O
group	O
led	O
by	O
Anant	O
Agarwal	O
at	O
the	O
Massachusetts	O
Institute	O
of	O
Technology	O
.	O
</s>
<s>
It	O
was	O
based	O
on	O
a	O
network	O
of	O
up	O
to	O
512	O
processing	O
nodes	O
,	O
each	O
of	O
which	O
used	O
the	O
Sparcle	B-General_Concept
computer	O
architecture	O
,	O
which	O
was	O
formed	O
by	O
modifying	O
a	O
Sun	O
Microsystems	O
SPARC	B-Architecture
CPU	B-Device
to	O
include	O
the	O
APRIL	O
techniques	O
for	O
fast	O
context	B-Operating_System
switches	I-Operating_System
.	O
</s>
<s>
The	O
Alewife	B-Operating_System
project	O
was	O
one	O
of	O
two	O
predecessors	O
cited	O
by	O
the	O
creators	O
of	O
the	O
popular	O
Beowulf	B-Operating_System
cluster	I-Operating_System
multiprocessor	B-Operating_System
.	O
</s>
