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.