Is there a command, utility, or Cocoa API for monitoring bandwidth usage, per process? [closed]

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,, 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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This question already has an answer here: Is there a command, utility, or Cocoa API for monitoring bandwidth usage, per process? [closed] 4 answers How to get how many bytes received and sent b

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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    blah.http              ESTABLISHED
tcp4  199610      0    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.

Install macports and then run

sudo port install iftop

which will install iftop. Now run

sudo iftop