Difference between revisions of "Bootchart"
(→BusyBox: how to generate a graph with bootchart2)
(→BusyBox: bootchartd needs 'tar -z')
|Line 46:||Line 46:|
==== To use ====
==== To use ====
Revision as of 02:51, 23 October 2013
Bootchart is a tool for performance analysis and visualization of the Linux boot process. Resource utilization and process information are collected during the user-space portion of the boot process and are later rendered in a PNG, SVG or EPS encoded chart. For embedded systems several developers have tried to use bootchart to analyze boot time, but problems arose. There have been several efforts to modify bootchart to make it more useful for embedded development.
Research & Presentations
- Tool introduced on Arjan Van de Ven's blog
- Now available in the mainline Linux kernel. It uses the 'perf' infrastructure. Hence, you need a recent enough kernel (2.6.32 or later).
- See tools/perf/builtin-timechart.c and tools/perf/Documentation/perf-timechart.txt in the kernel sources for details.
- bootchart-lite-en.pdf Presentation by Shuuji Miyake of Fujitsu Software Technologies Limited, about bootchart deficiencies in the embedded space and ideas for fixing them.
- Not sure this is related to bootchart-lite project on Google Code, below--that was created by Fred Chien of OpenMoko.
- Bootchart-lite Project Home
# Non-members may check out a read-only working copy anonymously over HTTP.
svn checkout http://bootchart-lite.googlecode.com/svn/trunk/ bootchart-lite-read-only
Like Bootchart Lite, an implementation of the ideas from "embootchart".
- Visualizing Resource Usage During Boot - Presentation on 'embootchart' by Matthew Klahn and Moosa Muhammad of Motorola about bootchart deficiencies in the embedded space, and a program (unfortunately never published) to fix them.
Busybox has a C implementation of bootchartd. It compiles to less than 40k (static uclibc i386 build). It will be available in the busybox-1.17.0 release. Please send bug reports, improvements to busybox mailing list.
Usage: bootchartd start [PROG ARGS]|stop|init Options: start: start background logging; with PROG, run PROG, then kill logging with USR1 stop: send USR1 to all bootchartd processes init: start background logging; stop when getty/xdm is seen (for init scripts) Under PID 1: start background logging, then execute $bootchart_init, /init, /sbin/init This makes it possible to start bootchartd even before init by booting kernel with: init=/sbin/bootchartd bootchart_init=/path/to/regular/init
Note that if you're using an initramfs, you'll need
Note also that bootchartd tries to create a gzipped tarball, so you either need a full tar with gz support, or you need to enable FEATURE_SEAMLESS_GZ in busybox. If 'tar -z' is not working, bootchartd will not produce output.
To use this, capture the bootchart information using bootchartd, then transfer the information to your host machine, and use bootchart to produce a graphic chart of the boot sequence.
The host 'bootchart' provided by Ubuntu-based hosts uses pybootchartgui to generate a graph from the collected data. However, that version of pybootchartgui does not work well with the data generated by busybox bootchartd. A newer project bootchart2 has improved pybootchartgui and included it in their sources, and this works fine with busybox bootchartd data.
After downloading bootchart2 and running 'make', you can generate a graph (bootchart.png) with:
An example graph, generated in a different way, is available on page Using bootchartd on SH7785LCR Board.
Bootchart has been forked and updated and can be found on github https://github.com/mmeeks/bootchart (Main changes: no java, better visualization)
Another fork (the same?) can be found here: Updated Bootchart