<s>
ktrace	B-Device
is	O
a	O
utility	O
included	O
with	O
certain	O
versions	O
of	O
BSD	B-Operating_System
Unix	I-Operating_System
and	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
that	O
traces	O
kernel	B-Operating_System
interaction	O
with	O
a	O
program	O
and	O
dumps	O
it	O
to	O
disk	O
for	O
the	O
purposes	O
of	O
debugging	O
and	O
analysis	O
.	O
</s>
<s>
Traced	O
kernel	B-Operating_System
operations	O
include	O
system	B-Operating_System
calls	I-Operating_System
,	O
namei	O
translations	O
,	O
signal	B-General_Concept
processing	O
,	O
and	O
I/O	B-General_Concept
.	O
</s>
<s>
Trace	B-Application
files	O
generated	O
by	O
ktrace	B-Device
(	O
named	O
by	O
default	O
)	O
can	O
be	O
viewed	O
in	O
human-readable	O
form	O
by	O
using	O
the	O
kdump	B-Application
utility	O
.	O
</s>
<s>
Since	O
Mac	B-Application
OS	I-Application
X	I-Application
Leopard	I-Application
,	O
ktrace	B-Device
has	O
been	O
replaced	O
by	O
DTrace	B-Application
.	O
</s>
