I have the same question like this, but for macOS.

There is a GUI solution with Activity Monitor. Any command line alternative? I use latest macOS Sierra.

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iotop is available in macOS/OS X itself.

iotop relies on dtrace though and you have to disable SIP in systems like El Capitan/Sierra to run dtrace.

Check man iotop for options and then execute iotop as root :

sudo iotop [-C] [-D|-o|-P] [-j|-Z] [-d device] [-f filename] [-m mount_point] [-t top] [interval [count]] 
  • 1
    You can also selectively disable SIP, as discussed here. – Daniel Griscom Aug 7 '18 at 13:18

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