<s>
nmon	B-Device
(	O
Nigel	O
's	O
Monitor	O
)	O
is	O
a	O
computer	O
performance	O
system	B-Application
monitor	I-Application
tool	O
for	O
the	O
AIX	B-Application
and	O
Linux	B-Application
operating	I-Application
systems	I-Application
.	O
</s>
<s>
The	O
nmon	B-Device
tool	O
has	O
two	O
modes	O
a	O
)	O
displays	O
the	O
performance	O
stats	O
on-screen	O
in	O
a	O
condensed	O
format	O
or	O
b	O
)	O
the	O
same	O
stats	O
are	O
saved	O
to	O
a	O
comma-separated	O
values	O
(	O
CSV	O
)	O
data	O
file	O
for	O
later	O
graphing	O
and	O
analysis	O
to	O
aid	O
the	O
understanding	O
of	O
computer	O
resource	O
use	O
,	O
tuning	O
options	O
and	O
bottlenecks	O
.	O
</s>
<s>
nmon	B-Device
for	O
Linux	B-Application
is	O
open	O
source	O
and	O
available	O
under	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
while	O
the	O
nmon	B-Device
for	O
AIX	B-Application
is	O
a	O
proprietary	B-Application
software	I-Application
integrated	O
into	O
AIX	B-Application
.	O
</s>
<s>
nmon	B-Device
collects	O
the	O
following	O
operating	O
system	O
statistics	O
:	O
</s>
<s>
Use	O
nmon	B-Device
-	O
?	O
</s>
<s>
The	O
original	O
nmon	B-Device
version	O
was	O
for	O
the	O
IBM	B-Application
AIX	I-Application
operating	O
system	O
(	O
Release	O
4.3	O
and	O
above	O
)	O
and	O
was	O
freely	O
downloadable	O
binary	O
format	O
only	O
tool	O
from	O
the	O
IBM	B-Application
AIX	I-Application
wiki	O
.	O
</s>
<s>
Later	O
a	O
version	O
was	O
written	O
for	O
the	O
Linux	B-Application
operating	I-Application
system	I-Application
running	O
on	O
IA-32	O
,	O
x86	O
,	O
x86_64	O
,	O
IBM	O
RS/6000	O
and	O
POWER	O
processors	O
,	O
Mainframe	O
and	O
ARM	O
(	O
including	O
Raspberry	O
Pi	O
)	O
.	O
</s>
<s>
nmon	B-Device
for	O
Linux	B-Application
was	O
released	O
by	O
IBM	O
as	O
open-source	B-Application
in	O
July	O
2009	O
.	O
</s>
<s>
The	O
nmon	B-Device
for	O
AIX	B-Application
code	O
was	O
later	O
bundled	O
in	O
as	O
part	O
of	O
the	O
AIX	B-Application
operating	I-Application
systems	I-Application
.	O
</s>
<s>
From	O
AIX	B-Application
5.3	O
TL09	O
and	O
AIX	B-Application
6.1	O
TL02	O
onward	O
it	O
was	O
included	O
in	O
the	O
default	O
installation	O
of	O
AIX	B-Application
and	O
fully	O
supported	O
by	O
IBM	O
.	O
</s>
<s>
The	O
nmon	B-Device
command	O
and	O
the	O
topas	O
command	O
are	O
the	O
same	O
binary	O
but	O
behave	O
differently	O
depending	O
on	O
the	O
command	O
name	O
used	O
.	O
</s>
<s>
The	O
two	O
editions	O
(	O
AIX	B-Application
and	O
Linux	B-Application
)	O
have	O
completely	O
different	O
source	O
code	O
but	O
offer	O
many	O
similar	O
features	O
,	O
command	O
line	O
options	O
and	O
data	O
as	O
much	O
as	O
the	O
underlying	O
operating	O
system	O
allow	O
.	O
</s>
<s>
In	O
Online	O
Mode	O
it	O
uses	O
curses	B-Device
for	O
efficient	O
screen	O
handling	O
,	O
which	O
updates	O
the	O
terminal	O
frequently	O
for	O
real-time	O
monitoring	O
.	O
</s>
<s>
nmon	B-Device
concentrates	O
on	O
performance	O
information	O
for	O
the	O
performance	O
tuner	O
and	O
in	O
a	O
concise	O
layout	O
to	O
aid	O
understanding	O
.	O
</s>
<s>
This	O
includes	O
CPU	O
,	O
memory	O
,	O
disks	O
,	O
adapters	O
,	O
networks	O
,	O
NFS	O
,	O
Kernel	O
statistics	O
,	O
File-systems	O
,	O
Workload	O
Manager	O
(	O
AIX	B-Application
)	O
,	O
Workload	O
Partitions	O
(	O
AIX	B-Application
)	O
and	O
Top	B-Device
Processes	O
.	O
</s>
<s>
nmon	B-Device
includes	O
support	O
for	O
older	O
AIX	B-Application
releases	O
,	O
Linux	B-Application
running	O
on	O
x86	O
,	O
POWER	O
and	O
Mainframe	O
platforms	O
and	O
other	O
Linux	B-Application
supporting	O
hardware	O
.	O
</s>
<s>
On	O
AIX	B-Application
,	O
there	O
is	O
the	O
topas	O
command	O
that	O
can	O
output	O
reports	O
to	O
a	O
file	O
but	O
this	O
is	O
not	O
in	O
a	O
format	O
that	O
can	O
be	O
used	O
easily	O
as	O
a	O
source	O
for	O
a	O
spreadsheet	O
or	O
web	O
tools	O
like	O
RRDtool	B-Language
.	O
</s>
<s>
On	O
Linux	B-Application
,	O
there	O
is	O
the	O
top	B-Device
command	I-Device
which	O
is	O
good	O
for	O
CPU	O
and	O
processes	O
but	O
does	O
not	O
cover	O
disks	O
and	O
networks	O
.	O
</s>
<s>
For	O
disk	O
I/O	O
,	O
the	O
iostat	B-Device
command	O
can	O
give	O
you	O
the	O
details	O
and	O
ntop	B-Protocol
for	O
network	O
information	O
.	O
</s>
<s>
Linux	B-Application
utility	O
dstat	O
can	O
be	O
used	O
to	O
produce	O
text	O
data	O
,	O
even	O
in	O
comma	O
separated	O
value	O
format	O
,	O
which	O
is	O
quite	O
suitable	O
for	O
spreadsheet	O
programs	O
.	O
</s>
