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 directory. The DTraceToolkit docs may include full worked examples with verbose descriptions explaining the output.
EXIT
iofile.d will sample until Ctrl-C is hit.
SEE ALSO
iosnoop(1M), dtrace(1M)