Loud Sounds can slow down disk I/O Post: 302287583

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seeksize.d

seeksize.d(1m)							   USER COMMANDS						    seeksize.d(1m)

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 ver-
       bose 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)

version 0.95							   May 14, 2005 						    seeksize.d(1m)