NAME

iofileb.d - I/O bytes by file and process. Uses DTrace.

SYNOPSIS

iofileb.d

DESCRIPTION

This prints a summary of requested disk activity by pathname, providing totals of the I/O events in bytes. It is a companion to the iofile.d script - which prints in terms of I/O wait time, not bytes. I/O wait time is a better metric for understanding performance issues. Both disk and NFS I/O are measured.

Since this uses DTrace, only users with root privileges can run this command.

EXAMPLES

Sample until Ctrl-C is hit then print report,: # iofileb.d

FIELDS

PID: process ID
CMD: process name
KB: kilobytes of disk I/O
FILE: file pathname

DOCUMENTATION

See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with verbose descriptions explaining the output.

EXIT

iofileb.d will sample until Ctrl-C is hit.