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Several people have talked about monitoring bandwidth on a per-device basis in a wireless setting; is there a way to monitor consumption on a per-process basis? Something like "top"? (and even "nice"?).

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Any particular OS? It can be done per PC, not sure how it you would monitor processes on a network of PCs. –  Moab Dec 26 '10 at 19:42
    
My particular interests would be in OS X and Windows –  Larry O'Brien Dec 26 '10 at 23:01
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3 Answers

May be you can have a look at this software Network traffic Monitor 2.01. This software shows you which processes in your machine are causing how much TCP/IP traffic and IP's.

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If all you're after is view and not control, NetLimiter ( http://www.netlimiter.com/ ) have a freeware version that can detect incoming and outgoing traffic by application for Windows boxes, each machine monitoring itself...

There's also Wireshark ( http://www.wireshark.org/ ), which will monitor pretty much the entire network from a single machine, but it does so on a packet level, which can be a bit "Information Overload" if you're not 100% sure what you're looking for.

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On windows, i'm not sure.

On unixalikes, i've used ntop and vnstat - one gives realtime info, like top, and the other over time.

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