Red Hat Enterprise Linux 3: System Administration Guide
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# 43.3. Starting and Stopping OProfile

To start monitoring the system with OProfile, execute the following command as root:

    opcontrol --start

Output similar to the following is displayed:

    Using log file /var/lib/oprofile/oprofiled.log
    Daemon started.
    Profiler running.

The settings in `/root/.oprofile/daemonrc` are used.

The OProfile daemon, `oprofiled`, is started; it periodically writes the sample data to the `/var/lib/oprofile/samples/` directory. The log file for the daemon is located at `/var/lib/oprofile/oprofiled.log`.

If OProfile is restarted with different configuration options, the sample files for the previous session are automatically backed up in the directory `/var/lib/oprofile/samples/session-`N``, where `N` is the number of the previously backed-up session plus 1.

    Backing up samples file to directory /var/lib/oprofile/samples//session-1
    Using log file /var/lib/oprofile/oprofiled.log
    Daemon started.
    Profiler running.

To stop the profiler, executing the following command as root:

    opcontrol --shutdown

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Configuring OProfile | Up | Saving Data