1BOOTCHART.CONF(5) bootchart.conf BOOTCHART.CONF(5)
2
6 bootchart.conf, bootchart.conf.d - Boot performance analysis graphing
7 tool configuration files
8
10 /etc/systemd/bootchart.conf
11 /etc/systemd/bootchart.conf.d/*.conf
13 /run/systemd/bootchart.conf.d/*.conf
15 /usr/lib/systemd/bootchart.conf.d/*.conf
17
19 When starting, systemd-bootchart will read the configuration file
20 /etc/systemd/bootchart.conf, followed by the files in the
21 bootchart.conf.d directories. These configuration files determine
22 logging parameters and graph output.
23
25 Default configuration is defined during compilation, so a configuration
26 file is only needed when it is necessary to deviate from those
27 defaults. By default the configuration file in /etc/systemd/ contains
28 commented out entries showing the defaults as a guide to the
29 administrator. This file can be edited to create local overrides.
30 When packages need to customize the configuration, they can install
32 configuration snippets in /usr/lib/systemd/*.conf.d/. Files in /etc/
33 are reserved for the local administrator, who may use this logic to
34 override the configuration files installed by vendor packages. The main
35 configuration file is read before any of the configuration directories,
36 and has the lowest precedence; entries in a file in any configuration
37 directory override entries in the single configuration file. Files in
38 the *.conf.d/ configuration subdirectories are sorted by their filename
39 in lexicographic order, regardless of which of the subdirectories they
40 reside in. If multiple files specify the same option, the entry in the
41 file with the lexicographically latest name takes precedence. It is
42 recommended to prefix all filenames in those subdirectories with a
43 two-digit number and a dash, to simplify the ordering of the files.
44 To disable a configuration file supplied by the vendor, the recommended
46 way is to place a symlink to /dev/null in the configuration directory
47 in /etc/, with the same filename as the vendor configuration file.
48
50 Samples=500
51 Configure the amount of samples to record in total before bootchart
52 exits. Each sample will record at intervals defined by Frequency=.
53 Frequency=25
55 Configure the sample log frequency. This can be a fractional
56 number, but must be larger than 0.0. Most systems can cope with
57 values under 25-50 without impacting boot time severely.
58 Relative=no
60 Configures whether the left axis of the output graph equals
61 time=0.0 (CLOCK_MONOTONIC start). This is useful for using
62 bootchart at post-boot time to profile an already booted system,
63 otherwise the graph would become extremely large. If set to yes,
64 the horizontal axis starts at the first recorded sample instead of
65 time=0.0.
66 Filter=no
68 Configures whether the resulting graph should omit tasks that did
69 not contribute significantly to the boot. Processes that are too
70 short-lived (only seen in one sample) or that do not consume any
71 significant CPU time (less than 0.001sec) will not be displayed in
72 the output graph.
73 Output=[path]
75 Configures the output directory for writing the graphs. By default,
76 bootchart writes the graphs to /run/log.
77 Init=[path]
79 Configures bootchart to run a non-standard binary instead of
80 /usr/lib/systemd/systemd. This option is only relevant if bootchart
81 was invoked from the kernel command line with
82 init=/usr/lib/systemd/systemd-bootchart.
83 PlotMemoryUsage=no
85 If set to yes, enables logging and graphing of processes' PSS
86 memory consumption.
87 PlotEntropyGraph=no
89 If set to yes, enables logging and graphing of the kernel random
90 entropy pool size.
91 ScaleX=100
93 Horizontal scaling factor for all variable graph components.
94 ScaleY=20
96 Vertical scaling factor for all variable graph components.
97 ControlGroup=no
99 Display process control group.
100
102 systemd-bootchart(1), systemd.directives(7)
103systemd 219 BOOTCHART.CONF(5)