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Anonymous
Asked: 2009-07-07 12:00:48 +0800 CST

How can I monitor network I/O usage per process under Linux?

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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?

linux networking io

2 Answers

  1. Best Answer

    nethogs looks like it will do what you want.

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

    • 38

  2. 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 littleyerry.example.com:55212->barista.example.com:ldap (ESTABLISHED)
bash    10913 luke    3u     IPv4 44638905      0t0      TCP littleyerry.example.com:55216->barista.example.com:ldap (ESTABLISHED)
ssh     10935 luke    3u     IPv4 44639001      0t0      TCP littleyerry.example.com:55219->barista.example.com:ldap (ESTABLISHED)
ssh     10935 luke    4u     IPv4 44639008      0t0      TCP littleyerry.example.com:59459->launchpad.example.com:ssh (ESTABLISHED)
bash    10938 luke    3u     IPv4 44639107      0t0      TCP littleyerry.example.com:55221->barista.example.com:ldap (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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