seeksize.d1m
Print disk event seek report. uses dtrace.
Usage
seeksize.d
Overview
seeksize.d is a simple DTrace program to print a report of disk event seeks by process.
This can be used to identify whether processes are accessing the disks in a "random" or "sequential" manner. Sequential is often desirable, indicated by mostly zero length seeks.
Since this uses DTrace, only users with root privileges can run this command.
Examples
- Sample until Ctrl-C is hit then print report,
-
#
seeksize.d
Fields
PID
|
process ID |
|---|---|
CMD
|
command and argument list |
value
|
distance in disk blocks (sectors) |
count
|
number of I/O operations |
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
seeksize.d will sample until Ctrl-C is hit.
Releases
115 releases since Mac OS X 10.5; the text changed 1 time.