a small 'net top' tool. Instead of breaking the traffic down per protocol or per subnet, like most tools do, it groups bandwidth by process.
NetHogs does not rely on a special kernel module to be loaded. If there's suddenly a lot of network traffic, you can fire up NetHogs and immediately see which PID is causing this. This makes it easy to identify programs that have gone wild and are suddenly taking up your bandwidth.
Since NetHogs heavily relies on /proc, most features are only available on Linux. NetHogs can be built on Mac OS X and FreeBSD, but it will only show connections, not processes...
iftop does for network usage what top(1) does for CPU usage. It listens to network traffic on a named interface and displays a table of current bandwidth usage by pairs of hosts. Handy for answering the question "why is our ADSL link so slow?"...
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NetHogs 可能就是您正在寻找的：
NetHogs is probably what you're looking for:
另外iftop：
Also iftop:
iptraf 是我的最爱。 它有一个漂亮的 ncurses 界面，以及过滤选项等。
iptraf is my favorite. It has a nice ncurses interface, and options for filtering, etc.
jnettop 是另一个候选者。
编辑：它只显示流，而不显示所有者进程。
jnettop is another candidate.
edit: it only shows the streams, not the owner processes.
ntop 或 nagios
ntop or nagios
检查 bmon。 它是 cli，简单并且有图表。
不完全是问什么问题 - 它不按进程划分，仅按网络接口划分。
Check bmon. It's cli, simple and has charts.
Not exactly what question asked - it doesn't split by processes, only by network interfaces.
您可以尝试的另一个选项是 iptstate。
Another option you could try is iptstate.