Per Process disk read/write statistics in Mac OS X

Question

How do I get programatically per process disk i/o statistics in Mac OS X. In \'Activity Monitor\' application or in \'top\' command we can only get whole system disk i/o statist

Answer 1

Since OP specifically asked for disk I/O statistics I'd recommend

sudo fs_usage -f diskio

which focuses only on read/write events, contrary to -f filesys as mentioned in the accepted answer. (Don't know if the diskio option wasn't available back then.)