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




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 direc-
       tory. 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(1)

Mac OS X 10.6 - Generated Thu Sep 17 20:09:08 CDT 2009
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