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diskhits(1m) [osx man page]

diskhits(1m)							   USER COMMANDS						      diskhits(1m)

NAME

       diskhits - disk access by file offset. Uses DTrace.

SYNOPSIS

       diskhits pathname

DESCRIPTION

       This  prints  how  a  file  was accessed, the locations on a distribution plot.	This is for the cache misses only - the file activity that
       resulted in disk events.

       Since this uses DTrace, only users with root privileges can run this command.

EXAMPLES

       Sample /var/adm/messages disk activity,
	      # diskhits /var/adm/messages

FIELDS

       Location (KB)
	      the file offset of the disk activity, Kbytes

       Size (KB)
	      size of the disk activity, Kbytes

       Total RW
	      Total disk activity, reads + writes

BASED ON

       /usr/demo/dtrace/applicat.d

DOCUMENTATION

       DTrace Guide "io Provider" chapter (docs.sun.com)

       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

       diskhits will sample until Ctrl-C is hit.

SEE ALSO

       dtrace(1M)

version 0.72							   Apr 20, 2006 						      diskhits(1m)

Check Out this Related Man Page

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

NAME

       iofileb.d - I/O bytes by file and process. Uses DTrace.

SYNOPSIS

       iofileb.d

DESCRIPTION

       This  prints  a	summary  of  requested	disk  activity	by pathname, providing totals of the I/O events in bytes. It is a companion to the
       iofile.d script - which prints in terms of I/O wait time, not bytes.  I/O wait time  is	a  better  metric  for	understanding  performance
       issues.	Both disk and NFS I/O are measured.

       Since this uses DTrace, only users with root privileges can run this command.

EXAMPLES

       Sample until Ctrl-C is hit then print report,
	      # iofileb.d

FIELDS

       PID    process ID

       CMD    process name

       KB     kilobytes of disk I/O

       FILE   file pathname

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

       iofileb.d will sample until Ctrl-C is hit.

SEE ALSO

       iofile.d(1M), iosnoop(1M), dtrace(1M)

version 1.00							   Feb 20, 2006 						     iofileb.d(1m)
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