Bootchart

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.

Timechart

 * 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

 * 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

ubootchart
Like Bootchart Lite, an implementation of the ideas from "embootchart".


 * ubootchart Project Home
 * Initial blog post

EmBootchart

 * [[Media:VisualizingResUsageDuringBoot.pdf|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
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.


 * Busybox Project Home
 * bootchartd applet code

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=/bin/bootchartd bootchart_init=/path/to/regular/init

To use
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.

Also see the following page describing a sample usage:
 * Using bootchartd on SH7785LCR Board

SystemTap Scripts
A related project is a set of System Tap scripts to provide information about boot time. See Bootprobe