NAME


opcontrol - control OProfile profiling

SYNOPSIS


opcontrol [ options ]

DESCRIPTION


opcontrol can be used to start profiling, end a profiling session, dump profile data, and set up the profiling parameters.

OPTIONS


--help
 Show help message.
--version
 Show version.
--list-events
 Shows the monitorable events.
--init
 Load the OProfile module if required and make the OProfile driver interface available.
--setup
 Followed by list options for profiling setup. Store setup in ~root/.oprofile/daemonrc. Optional.
--status
 Show configuration information.
--start-daemon
 Start the oprofile daemon without starting profiling. Not available in 2.2/2.4 kernels.
--start
 Start data collection with either arguments provided by --setup or with information saved in ~root/.oprofile/daemonrc.
--dump
 Force a flush of the collected profiling data to the daemon.
--stop
 Stop data collection. Not available in 2.2/2.4 kernels.
--shutdown
 Stop data collection and kill the daemon.
--reset
 Clear out data from current session, but leaves saved sessions.
--save=sessionname
 Save data from current session to sessionname.
--deinit
 Shut down daemon. Unload the oprofile module and oprofilefs.
--session-dir=dir_path
 Use sample database out of directory dir_path instead of the default location (/var/lib/oprofile).
--buffer-size=num
 Set kernel buffer to num samples. When using a 2.6 kernel buffer watershed need to be tweaked when changing this value.
--buffer-watershed=num
 Set kernel buffer watershed to num samples (2.6 only). When it’ll remain only buffer-size - buffer-watershed free entry in the kernel buffer data will be flushed to daemon, most usefull value are in the range [0.25 - 0.5] * buffer-size.
--cpu-buffer-size=num
 Set kernel per cpu buffer to num samples (2.6 only). If you profile at high rate it can help to increase this if the log file show excessive count of sample lost cpu buffer overflow.
--event=[event|default]
 Specify an event to measure for the hardware performance counters, or "default" for the default event. The event is of the form "CPU_CLK_UNHALTED:30000:0:1:1" where the numeric values are count, unit mask, kernel-space counting, user-space counting, respectively. Note that this over-rides all previous events selected; if you want two or more counters used simultaneously, you must specify them on the same opcontrol invocation.
--separate=[none,lib,kernel,thread,cpu,all]
 Separate samples based on the given separator. ’lib’ separates dynamically linked library samples per application. ’kernel’ separates kernel and kernel module samples per application; ’kernel’ implies ’library’. ’thread’ gives separation for each thread and task. ’cpu’ separates for each CPU. ’all’ implies all of the above options and ’none’ turns off separation.
--callgraph=#depth
 Enable callgraph sample collection with a maximum depth. Use 0 to disable callgraph profiling. This option is available on x86 using a 2.6+ kernel with callgraph support enabled. It is also available on PowerPC using a 2.6.17+ kernel.
--image=[name,name...|all]
 Only profile the given absolute paths to binaries, or "all" to profile everything (the default).
--vmlinux=file
 vmlinux kernel image.
--no-vmlinux
 Use this when you don’t have a kernel vmlinux file, and you don’t want to profile the kernel.
--verbose
 Be verbose in the daemon log. This has a high overhead.
--kernel-range=start,end
 Set kernel range vma address in hexadecimal.

OPTIONS (specific to Xen)


--xen=file
 Xen image
--active-domains=<list>
 List of domain ids participating in a multi-domain profiling session. If more than one domain is specified in <list> they should be separated using commas. This option can only be used in domain 0 which is the only domain that can coordinate a multi-domain profiling session. Including domain 0 in the list of active domains is optional. (e.g. --active-domains=2,5,6 and --active-domains=0,2,5,6 are equivalent)

ENVIRONMENT


No special environment variables are recognised by opcontrol.

FILES


/root/.oprofile/daemonrc
 Configuration file for opcontrol
/var/lib/oprofile/samples/
 The location of the generated sample files.

VERSION


This man page is current for oprofile-0.9.5.
 

SEE ALSO


/usr/share/doc/oprofile/, oprofile(1)

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