NAME

       bootchart.conf, bootchart.conf.d - Boot performance analysis graphing tool configuration
       files

SYNOPSIS

       /etc/systemd/bootchart.conf

       /etc/systemd/bootchart.conf.d/*.conf

       /run/systemd/bootchart.conf.d/*.conf

       /usr/lib/systemd/bootchart.conf.d/*.conf

DESCRIPTION

       When starting, systemd-bootchart will read the configuration file
       /etc/systemd/bootchart.conf, followed by the files in the bootchart.conf.d directories.
       These configuration files determine logging parameters and graph output.

CONFIGURATION DIRECTORIES AND PRECEDENCE

       The default configuration is defined during compilation, so a configuration file is only
       needed when it is necessary to deviate from those defaults. By default, the configuration
       file in /etc/systemd/ contains commented out entries showing the defaults as a guide to
       the administrator. This file can be edited to create local overrides.

       When packages need to customize the configuration, they can install configuration snippets
       in /usr/lib/systemd/*.conf.d/. Files in /etc/ are reserved for the local administrator,
       who may use this logic to override the configuration files installed by vendor packages.
       The main configuration file is read before any of the configuration directories, and has
       the lowest precedence; entries in a file in any configuration directory override entries
       in the single configuration file. Files in the *.conf.d/ configuration subdirectories are
       sorted by their filename in lexicographic order, regardless of which of the subdirectories
       they reside in. If multiple files specify the same option, the entry in the file with the
       lexicographically latest name takes precedence. It is recommended to prefix all filenames
       in those subdirectories with a two-digit number and a dash, to simplify the ordering of
       the files.

       To disable a configuration file supplied by the vendor, the recommended way is to place a
       symlink to /dev/null in the configuration directory in /etc/, with the same filename as
       the vendor configuration file.

OPTIONS

       Samples=500
           Configure the amount of samples to record in total before bootchart exits. Each sample
           will record at intervals defined by Frequency=.

       Frequency=25
           Configure the sample log frequency. This can be a fractional number, but must be
           larger than 0.0. Most systems can cope with values under 25–50 without impacting boot
           time severely.

       Relative=no
           Configures whether the left axis of the output graph equals time=0.0 (CLOCK_MONOTONIC
           start). This is useful for using bootchart at post-boot time to profile an already
           booted system, otherwise the graph would become extremely large. If set to yes, the
           horizontal axis starts at the first recorded sample instead of time=0.0.

       Filter=no
           Configures whether the resulting graph should omit tasks that did not contribute
           significantly to the boot. Processes that are too short-lived (only seen in one
           sample) or that do not consume any significant CPU time (less than 0.001sec) will not
           be displayed in the output graph.

       Output=[path]
           Configures the output directory for writing the graphs. By default, bootchart writes
           the graphs to /run/log.

       Init=[path]
           Configures bootchart to run a non-standard binary instead of /lib/systemd/systemd.
           This option is only relevant if bootchart was invoked from the kernel command line
           with init=/lib/systemd/systemd-bootchart.

       PlotMemoryUsage=no
           If set to yes, enables logging and graphing of processes' PSS memory consumption.

       PlotEntropyGraph=no
           If set to yes, enables logging and graphing of the kernel random entropy pool size.

       ScaleX=100
           Horizontal scaling factor for all variable graph components.

       ScaleY=20
           Vertical scaling factor for all variable graph components.

       ControlGroup=no
           Display process control group.

SEE ALSO

       systemd-bootchart(1), systemd.directives(7)