bootchart.conf(5)


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)





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