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Re: bandwidth measurement by process

On Sun, May 9, 2010 at 12:33, Celejar <celejar@gmail.com> wrote:
On Sun, 9 May 2010 12:15:49 +0530
Anand Sivaram <aspnair@gmail.com> wrote:

> On Sun, May 9, 2010 at 11:38, Celejar <celejar@gmail.com> wrote:
> > Hi,
> >
> > I'm looking for a tool that will measure bandwidth used by a specific
> > process. I'd like some sort of utility or wrapper that will answer
> > questions like "How much data did my network backup job push over the
> > wire?"


>  nethogs is unique in that manner, as per their website itself.
> http://nethogs.sourceforge.net/
> see section "Links" in their website
> Most of the other tools give rate per tcp/udp sessions based on port numbers
> and remote address information.
> So you may not find any other program to take care of this.  I think it is
> doable with a few hundred lines of code.
> This is what is required to be done.
> * /proc/<pid>/fd look for the socket inode numbers
> * correlate those inode numbers in /proc/net/tcp and /proc/net/udp to find
> the
>    source and destination ip and port details
> * use libpcap to open the interface and capture the packet, from this you
> could get the packet length, rate etc of each tcp, udp session
> Combining the above, it is possible to get what you need.

Yeah, that's pretty much what I thought.  Well, I think that I'm going
to code something like this, unless someone else will point out that
it's already been done.

I'm actually surprised that such a tool doesn't exist.  Isn't this
something quite useful?  Aren't the sorts of questions that I want
answered pretty universal and important?

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Many of the programs are created when a potential developer felt that he/she requires such a program, but his/her requirement is not met by the existing programs.  Now you are feeling that your requirement is not fulfilled and you are planning to get something of your own :)
Your plan is really good, I could provide any help, in case you require any.

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