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Such known tools like iftop/iptraf display network I/O per interface and per connection. Is there a way to see network I/O statistics per process?

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up vote 26 down vote accepted

nethogs looks like it will do what you want.

EDIT: I needed to install ncurses-devel, libpcap and libpcap-devel to build.

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great addition to my toolbox, thanks. – Luke404 Mar 15 '12 at 14:12
@yag there is no need to add "EDIT" to the post. We can already see the history of what changed. – Tshepang May 27 at 14:03
@Tshepang I reviewed your edit, I kept the updated link you did but I kept the edit text, as for me it added value, like your edit too. – yagmoth555 May 27 at 14:22
@yagmoth555 I mean why keep "EDIT" in the post? We have history to show what has been edited, so there is no need to mention that "text that follows is an edit". – Tshepang May 27 at 15:36
@Tshepang Oh, Check your edit, you removed the entire line surely by error then, that why I re-edited to keep the line – yagmoth555 May 27 at 15:56

To find what connections are associated with each process, use lsof. For example:

lsof | grep TCP

That will give you a list of connections, like this:

bash    10887 luke    3u     IPv4 44638801      0t0      TCP> (ESTABLISHED)
bash    10913 luke    3u     IPv4 44638905      0t0      TCP> (ESTABLISHED)
ssh     10935 luke    3u     IPv4 44639001      0t0      TCP> (ESTABLISHED)
ssh     10935 luke    4u     IPv4 44639008      0t0      TCP> (ESTABLISHED)
bash    10938 luke    3u     IPv4 44639107      0t0      TCP> (ESTABLISHED)

From there, you should be able to find out about each connection individually using the tools you mentioned (iftop, iptraf). You could build a small script to aggregate the specific data that you're looking for.

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