iofile.d - I/O wait time by file and process. Uses DTrace. iofile.d 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 the root user or users with the dtrace_kernel privilege can run this command. Solaris stable - needs the io provider.

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

PID process ID

CMD process name

TIME total wait time for disk events, us

FILE file pathname

/usr/demo/dtrace/iocpu.d

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)