|
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OPTIONS (specific to Xen) | OPTIONS (specific to System z) | ENVIRONMENT | FILES | VERSION | SEE ALSO | COLOPHON |
OPCONTROL(1) General Commands Manual OPCONTROL(1)
opcontrol - control OProfile profiling
opcontrol [ options ]
opcontrol can be used to start profiling, end a profiling session,
dump profile data, and set up the profiling parameters.
--help / -?
Show help message.
--version / -v
Show version.
--list-events / -l
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.
--start / -s
Start data collection with either arguments provided by
--setup or with information saved in ~root/.oprofile/daemonrc.
--dump / -d
Force a flush of the collected profiling data to the daemon.
--stop / -t
Stop data collection.
--shutdown / -h
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. The buffer watershed needs
to be tweaked when changing this value. Rules: A non-zero
value goes into effect after a '--shutdown/start' sequence. A
value of zero sets this parameter back to default value, but
does not go into effect until after '--deinit/init' sequence.
--buffer-watershed=num
Set kernel buffer watershed to num samples. When buffer-size -
buffer-watershed free entries remain in the kernel buffer,
data will be flushed to the daemon. Most useful values are in
the range [0.25 - 0.5] * buffer-size. Same rules as defined
for buffer-size.
--cpu-buffer-size=num
Set kernel per-cpu buffer to num samples. 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. Same rules
as defined for buffer-size.
--event / -e [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 to profile with two or
more events simultaneously, you must specify them on the same
opcontrol invocation. You can specify unit mask values using
either a numerical value (hex values must begin with "0x") or
a symbolic name (if the name=<um_name> field is shown in the
ophelp output). For some named unit masks, the hex value is
not unique; thus, OProfile tools enforce specifying such unit
masks value by name.
--separate / -p [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 / -c [#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 / -i [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 / -V [options]
Be verbose in the daemon log. This has a high overhead.
--kernel-range=start,end
Set kernel range vma address in hexadecimal.
--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)
--s390hwsampbufsize=num
Number of 2MB areas used per CPU for storing sample data. The
best size for the sample memory depends on the particular
system and the workload to be measured. Providing the sampler
with too little memory results in lost samples. Reserving too
much system memory for the sampler impacts the overall
performance and, hence, also the workload to be measured.
No special environment variables are recognised by opcontrol.
/root/.oprofile/daemonrc
Configuration file for opcontrol
/var/lib/oprofile/samples/
The location of the generated sample files.
This man page is current for oprofile-1.0.0git.
/usr/local/share/doc/oprofile/, oprofile(1)
This page is part of the oprofile (a system-wide profiler for Linux)
project. Information about the project can be found at
⟨http://oprofile.sourceforge.net/news/⟩. If you have a bug report for
this manual page, see ⟨http://oprofile.sourceforge.net/bugs/⟩. This
page was obtained from the project's upstream Git repository ⟨git⟩ on
2017-07-05. If you discover any rendering problems in this HTML ver‐
sion of the page, or you believe there is a better or more up-to-date
source for the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original man‐
ual page), send a mail to man-pages@man7.org
4th Berkeley Distribution Sun 20 July 2014 OPCONTROL(1)