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How do I know how many bandwidth an individual application are consuming on Mac OS X?

I often watch how much traffic there is on my local machine. Sometimes I wonder what applications actually do use how much of the traffic. Is there any way I can find out?

(I am not asking about what applications currently have open connections. That is easy; I know multiple methods how to get that information. I am asking about what application is generating how much traffic.)

I want a free solution. (So Little Snitch is not an option.)

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marked as duplicate by Arjan, Ivo Flipse Oct 30 '10 at 17:20

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
this might me a partial solution: superuser.com/questions/203328/packet-sniffing-tools/… –  Jay Oct 30 '10 at 15:44
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@Albert. It seems we read different Meta Answers, but irrelevant, Super User has always had a strict closing policy, and free or not, this is a duplicate. The duplicate question has not specified free or not, and if a free application should ever become available, it will be updated accordingly. –  Diago Nov 2 '10 at 17:11
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@Albert. Seriously? Are you bored. What makes your question more specialised? The word free? Seriously? One feature difference request does not make a question less of a duplicate or more specialised. If you want to split hairs feel free to do so, however there is not enough motivation for this question to stay open, when all the answers are exactly the same then the listed duplicates. Deal with it and move on. –  Diago Nov 2 '10 at 17:46
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@Albert, to me it's important to keep duplicates closed as this very site aims to be a easily searchable Q&A, not a personal help forum. That is: we're trying to give people one place with all possible answers for each question -- not a list of duplicate questions with many duplicate answers. Your question and the others (and I just listed two, but I guess there are more) are the same, in my opinion. (Why would the other question askers reject a free solution if such answer was posted?) –  Arjan Nov 2 '10 at 18:06
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@Albert Did you maybe even remotely consider that what your looking for does not exist? In fact, considering that I was looking for the same thing, I can tell you with 100% certainty, apart from Wireshark that's free, and Little Snitch, there is no free software for the Mac that does this. –  Diago Nov 9 '10 at 5:13
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2 Answers

You can use a program like wireshark to capture packet traffic and do analysis on it.

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Maybe the question title was bad. I don't really want to do analyzation. I just want to see how much traffic each application is consuming. I am not sure if Wireshark can do this. –  Albert Oct 30 '10 at 16:38
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Little Snitch costs money but seems but can monitor network activity on a per-application basis.

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