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]