[NMAP] Question about service version detection

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Hi,

I am attempting to run NMAP from a memory constrained device and to profile
the memory footprint of NMAP, I'm running it using valgrind's massif. I had
a couple of questions regarding this and I was hoping someone from the NMAP
team could help me out!

I see that the memory consumed increases as the number of open ports and
the duration of the scan increases. Is this because a data structure is
being populated with probe results (asynchronous I/O) that's growing in
size? The database that is referred to is simply 2.5MB, so that should be
loaded only once onto the RAM right?

Also, is there any way that I can optimize/restrict the maximum amount of
RAM consumed by NMAP? I see that the order of memory consumption (highest
to lowest) is Service Version Detection, OS Detection, TCP & UDP scans.

I have read Chapter 7 <http://I have read Chapter 7, but I didn't get the
answers to my questions.>, but I didn't get the answers to my questions.

I'm very new to NMAP and if this isn't the right place to post the
question, I apologize and request you to point me in the right direction!

Thanks,
Kushal

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<div dir=3D"ltr">Hi,<div><br></div><div>I am attempting to run NMAP from a =
memory constrained device and to profile the memory footprint of NMAP, I&#3=
9;m running it using valgrind&#39;s massif. I had a couple of questions reg=
arding this and I was hoping someone from the NMAP team could help me out!<=
/div><div><br></div><div>I see that the memory consumed increases as the nu=
mber of open ports and the duration of the scan increases. Is this because =
a data structure is being populated with probe results (asynchronous I/O) t=
hat&#39;s growing in size? The database that is referred to is simply 2.5MB=
, so that should be loaded only once onto the RAM right?=C2=A0</div><div><b=
r></div><div>Also, is there any way that I can optimize/restrict the maximu=
m amount of RAM consumed by NMAP? I see that the order of memory consumptio=
n (highest to lowest) is Service Version Detection, OS Detection, TCP &amp;=
 UDP scans.=C2=A0</div><div><br></div><div>I have read <a href=3D"http://I =
have read Chapter 7, but I didn&#39;t get the answers to my questions.">Cha=
pter 7</a>, but I didn&#39;t get the answers to my questions.=C2=A0=C2=A0<b=
r></div><div><br></div><div>I&#39;m very new to NMAP and if this isn&#39;t =
the right place to post the question, I apologize and request you to point =
me in the right direction!</div><div><br></div><div>Thanks,</div><div>Kusha=
l</div></div>

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