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 statistics.
For reference Similar question asked for PC.

Answer 1

Use iotop (as root), for example:

iotop -C 3 10 

But the best way (for me) is:

sudo fs_usage -f filesys 

Answer 2

Since there isn't an answer here about how to do this programatically, here's some more info. You can get some info out of libproc if you can use C/C++/ObjectiveC++. The function proc_pid_rusage gives you a bunch of resource info for a given process, but the ones related to your question are:

struct rusage_info_v3 {     ...     uint64_t ri_diskio_bytesread;     uint64_t ri_diskio_byteswritten;     ... }; 

Sample code:

pid_t pid = 10000; rusage_info_current rusage; if (proc_pid_rusage(pid, RUSAGE_INFO_CURRENT, (void **)&rusage) == 0) {     cout << rusage.ri_diskio_bytesread << endl;     cout << rusage.ri_diskio_byteswritten << endl; } 

See <libproc.h> and <sys/resource.h> for more info.