hotspot.d(1) USER COMMANDS hotspot.d(1)
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 direc- tory. 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(1)
Mac OS X 10.6 - Generated Thu Sep 17 20:07:49 CDT 2009