hotspot.d(1m) [mojave man page]

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

NAME

       hotspot.d - print disk event by location. Uses DTrace.

SYNOPSIS

       hotspot.d

DESCRIPTION

       hotspot.d  is a simple DTrace script to determine if disk activity is occuring in the one place - a "hotspot". This helps us understand the
       system's usage of a disk, it does not imply that the existance or not of a hotspot is good or bad (often may be good, less seeking).

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

EXAMPLES

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

FIELDS

       Disk   disk instance name

       Major  driver major number

       Minor  driver minor number

       value  location of disk event, megabytes

       count  number of events

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

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

AUTHOR

       Brendan Gregg [Sydney, Australia]

SEE ALSO

       dtrace(1M)

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

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

NAME

       syscallbysysc.d - syscalls by syscall. Uses DTrace.

SYNOPSIS

       syscallbysysc.d

DESCRIPTION

       syscallbysysc.d is a DTrace OneLiner to a report of the number of each type of system call made.

       This is useful to identify which system call is the most common.

       Docs/oneliners.txt and Docs/Examples/oneliners_examples.txt in the DTraceToolkit contain this as a oneliner that can be cut-n-paste to run.

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

EXAMPLES

       This samples until Ctrl-C is hit.
	      # syscallbysysc.d

FIELDS

       first field
	      This is the system call type. Most have man pages in section 2.

       second field
	      This is the count, the number of occurrances for this system call.

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

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

AUTHOR

       Brendan Gregg [Sydney, Australia]

SEE ALSO

       procsystime(1M), dtrace(1M), truss(1)

version 1.00							   May 15, 2005 					       syscallbysysc.d(1m)