<s>
PRAM	B-General_Concept
consistency	I-General_Concept
(	O
pipelined	O
random	B-Architecture
access	I-Architecture
memory	I-Architecture
)	O
also	O
known	O
as	O
FIFO	B-Operating_System
consistency	B-General_Concept
.	O
</s>
<s>
All	O
processes	B-Operating_System
see	O
memory	B-General_Concept
writes	O
from	O
one	O
process	O
in	O
the	O
order	O
they	O
were	O
issued	O
from	O
the	O
process	O
.	O
</s>
<s>
Writes	O
from	O
different	O
processes	B-Operating_System
may	O
be	O
seen	O
in	O
a	O
different	O
order	O
on	O
different	O
processes	B-Operating_System
.	O
</s>
<s>
PRAM	B-General_Concept
consistency	I-General_Concept
is	O
easy	O
to	O
implement	O
.	O
</s>
<s>
In	O
effect	O
it	O
says	O
that	O
there	O
are	O
no	O
guarantees	O
about	O
the	O
order	O
in	O
which	O
different	O
processes	B-Operating_System
see	O
writes	O
,	O
except	O
that	O
two	O
or	O
more	O
writes	O
from	O
a	O
single	O
source	O
must	O
arrive	O
in	O
order	O
,	O
as	O
though	O
they	O
were	O
in	O
a	O
pipeline	O
.	O
</s>
<s>
Fig	O
:	O
A	O
valid	O
sequence	O
of	O
events	O
for	O
PRAM	B-General_Concept
consistency	I-General_Concept
.	O
</s>
<s>
The	O
above	O
sequence	O
is	O
not	O
valid	O
for	O
Causal	B-General_Concept
consistency	I-General_Concept
because	O
W(x )	O
1	O
and	O
W(x )	O
2	O
are	O
causal	O
,	O
so	O
different	O
processes	B-Operating_System
must	O
read	O
it	O
in	O
the	O
same	O
sequence	O
.	O
</s>
