The viotop utility is simply a wrapper for the iotop program.
vtop [options]
viotop - The viotop utility is simply a wrapper for the iotop program, that enables iotop to show you the I/O stats for all the processes on the system, instead of only the ones in the current s_context (see cat /proc/self/status).
See man iotop.
/usr/sbin/viotop
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This Man page was written by Carlos Alberto Lopez Perez <[email protected]> based on the vtop(8) manpage.