<s>
TestU01	B-Algorithm
is	O
a	O
software	B-Library
library	I-Library
,	O
implemented	O
in	O
the	O
ANSI	O
C	O
language	O
,	O
that	O
offers	O
a	O
collection	O
of	O
utilities	O
for	O
the	O
empirical	O
randomness	O
testing	O
of	O
random	O
number	O
generators	O
(	O
RNGs	O
)	O
.	O
</s>
<s>
An	O
initial	O
battery	O
of	O
randomness	O
tests	O
for	O
RNGs	O
was	O
suggested	O
in	O
the	O
1969	O
first	O
edition	O
of	O
The	B-General_Concept
Art	I-General_Concept
of	I-General_Concept
Computer	I-General_Concept
Programming	I-General_Concept
by	O
Donald	O
Knuth	O
.	O
</s>
<s>
The	O
inability	O
to	O
modify	O
the	O
test	O
parameters	O
or	O
add	O
new	O
tests	O
led	O
to	O
the	O
development	O
of	O
the	O
TestU01	B-Algorithm
library	O
.	O
</s>
<s>
TestU01	B-Algorithm
offers	O
four	O
groups	O
of	O
modules	O
for	O
analyzing	O
RNGs	O
:	O
</s>
<s>
When	O
a	O
specific	O
test	O
is	O
applied	O
to	O
a	O
sample	O
of	O
size	O
n	O
produced	O
by	O
an	O
RNG	O
,	O
the	O
p-value	B-General_Concept
of	O
the	O
test	O
usually	O
will	O
remain	O
reasonable	O
as	O
the	O
sample	O
size	O
increases	O
until	O
the	O
sample	O
size	O
hits	O
n0	O
,	O
say	O
.	O
</s>
<s>
After	O
that	O
,	O
the	O
p-value	B-General_Concept
diverges	O
to	O
0	O
or	O
1	O
with	O
exponential	O
speed	O
.	O
</s>
<s>
TESTU01	B-Algorithm
offers	O
several	O
batteries	O
of	O
tests	O
including	O
"	O
Small	O
Crush	O
"	O
(	O
which	O
consists	O
of	O
10	O
tests	O
)	O
,	O
"	O
Crush	O
"	O
(	O
96	O
tests	O
)	O
,	O
and	O
"	O
Big	O
Crush	O
"	O
(	O
106	O
tests	O
)	O
.	O
</s>
<s>
On	O
a	O
1.7GHz	O
Pentium	B-General_Concept
4	I-General_Concept
running	O
Red	O
Hat	O
Linux	O
9.0	O
,	O
for	O
a	O
simple	O
RNG	O
,	O
Small	O
Crush	O
takes	O
about	O
2	O
minutes	O
.	O
</s>
<s>
TestU01	B-Algorithm
only	O
accepts	O
32-bit	O
inputs	O
,	O
and	O
interprets	O
them	O
as	O
values	O
in	O
the	O
range	O
 [ 0 , 1 ] 	O
.	O
</s>
