iofile.d(1m) USER COMMANDS iofile.d(1m)

iofile.d - I/O wait time by file and process. Uses DTrace.


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.

# iofile.d

process ID
process name
total wait time for disk events, us
file pathname


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

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

iosnoop(1M), dtrace(1M)

July 24, 2005 version 0.70