Original question: On the PC there are several programs that will show you your bandwidth usage on a per process or per program basis. Is there anyway of doing something similar on the Mac?
@note As this question has a LARGE number of hits, yet was closed before it could be answered properly, let me rephrase it (hopefully more palatably) so that it can get answered / canonicalized, once and for all!
So then.. Is there an officially sanctioned / system-installed (i.e. nettop, Activity-Monitor.app), third-party (i.e. brew-able), or Objecive-C API to track, or otherwise stat the specific bandwidth usage totals, per running process? Ideally this would be a programatically-accessible resource, i.e. through a library call, XPC helper, or a readable output stream.
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Out of the box, OS X will give you data totals with netstat
$ netstat -a Proto Recv-Q Send-Q Local Address Foreign Address (state) tcp4 0 0 192.168.1.113.62913 blah.http ESTABLISHED tcp4 199610 0 192.168.1.113.61334 blah ESTABLISHED
In addition to LittleSnitch (which I love for other reasons), there is a more UNIX-like way to monitor network traffic: ntop.
ntop has the advantage of being portable to other UNIX systems.
You’ll need to download and install gdbm. A note about the gdbm install, you’ll want to edit the Makefile and set the user and group, the package default of bin doesn’t exist on macosx.
I actually went to compile ntop on my mac, and found to my disgust that they expanded the basic app out into a pseudo network monitoring application… thereby requiring a lot of crap that I don’t want ;( Not a very UNIX thing to do.