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
fddist(1m) USER COMMANDS fddist(1m) NAME
fddist - file descriptor usage distributions. Uses DTrace. SYNOPSIS
fddist [-r|-w] DESCRIPTION
This prints distributions for read and write events by file descriptor, by process. This can be used to determine which file descriptor a process is doing the most I/O with. Since this uses DTrace, only users with root privileges can run this command. OPTIONS
-r reads only -w writes only EXAMPLES
Sample both read and write activity, # fddist Sample reads only, # fddist -r FIELDS
EXEC process name PID process ID value file descriptor count number of events BASED ON
/usr/demo/dtrace/lquantize.d DOCUMENTATION
DTrace Guide "Aggregations" 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
fddist will sample until Ctrl-C is hit. SEE ALSO
dtrace(1M) version 0.70 Jun 08, 2005 fddist(1m)