iofile.d(1) USER COMMANDS iofile.d(1)
NAME
iofile.d - I/O wait time by file and process. Uses DTrace.
SYNOPSIS
iofile.d
DESCRIPTION
This prints the total I/O wait times for each filename by process.
This can help determine why an application is performing poorly by
identifying which file they are waiting on, and the total times. 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,
# iofile.d
FIELDS
PID process ID
CMD process name
TIME total wait time for disk events, us
FILE file pathname
BASED ON
/usr/demo/dtrace/iocpu.d
DOCUMENTATION
See the DTraceToolkit for further documentation under the Docs direc-
tory. The DTraceToolkit docs may include full worked examples with ver-
bose descriptions explaining the output.
EXIT
iofile.d will sample until Ctrl-C is hit.
SEE ALSO
iosnoop(1M), dtrace(1M)
version 0.70 Jul 24, 2005 iofile.d(1)
Mac OS X 10.6 - Generated Thu Sep 17 20:07:55 CDT 2009