iofile.d1m
I/o wait time by file and process. uses dtrace.
Usage
iofile.d
Overview
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.
Releases
115 releases since Mac OS X 10.5; the text changed 1 time.