NAME
seeksize.d - print disk event seek report. Uses DTrace.
SYNOPSIS
seeksize.d
DESCRIPTION
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.
AUTHOR
Brendan Gregg [Sydney, Australia]
SEE ALSO
iosnoop(1M), bitesize.d(1M), dtrace(1M)