man: move bootchart README to manpage, docbooksify
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Bootchart - a 'startup' graphing tool
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--
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Bootchart is a tool, usually run at system startup, that collects and graphs
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the CPU and disk load of the system as it works. The output of bootchart is
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an SVG graph. Normally, bootchart is invoked as `bootchartd` by the kernel
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by passing "init=/sbin/bootchartd" to the kernel. Bootchart will then fork
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init off to resume normal system startup, while monitoring and logging
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startup information in the background.
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After collecting a certain amount of data (usually 15-30 seconds) the logging
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stops and a graph is generated from the logged information. This graph
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contains vital clues to which resources are being used, in which order, and
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where possible problems exist in the startup sequence of the system.
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Of course, bootchart can also be used at any moment in time to collect and
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graph some data for an amount of time. Bootchart does not even require root
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privileges to do so, and will happily run as a normal user. Bootchart graphs
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are by default written time-stamped in /run/log.
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--
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This version of bootchart was implemented from scratch and inspired by former
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incantations of bootchart:
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- The original bash/shell code implemented bootchart. This version logged all
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data into a compressed tarball for later processing, and did not create a graph
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on it's own.
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- The C-code implementation found in Ubuntu. This version replaced above shell
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code version with a faster and efficient data logger, but still did not graph
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code itself.
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- the original Java-based bootchart, the original graphing program that created
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a bootchart graph from logged data.
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- the pybootchartgui.py program, which created a graph based on the data logged
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by either standalone data logger.
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The version you are looking at combines these 2 parts into a single program,
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which makes running it and creating graphs a bit more efficient and simple.
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You can now run a single program at startup instead of 2. There are no timing
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problems (the graphing stage will never run if the logging stage didn't
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finish). The logged data isn't being written to disc first, then read again.
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Also, the data kept in memory is reduced to the absolute minimum needed to
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keep memory use low.
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--
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Requirements: glibc. Your kernel must have procfs support and several
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proc output options enabled:
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CONFIG_PROC_FS
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CONFIG_SCHEDSTATS
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CONFIG_SCHED_DEBUG
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at a minimum. bootchartd itself does not require any graphics library
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to generate the SVG output file.
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--
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Configuration: please see bootchartd --help, as well as /etc/bootchartd.conf
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and/or /usr/share/doc/bootchart/bootchartd.conf.example for a list of
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configurable options.
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--
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Many thanks to those who contributed ideas and code:
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- Ziga Mahkovec - Original bootchart author
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- Anders Norgaard - PyBootchartgui
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- Michael Meeks - bootchart2
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- Scott James Remnant - Ubuntu C-based logger
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- Arjan van der Ven - for the idea to merge bootgraph.pl functionality
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--
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For bugs, please contact the author or current maintainer:
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Auke Kok <auke-jan.h.kok@intel.com>
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--
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Download bootchart releases here: http://foo-projects.org/~sofar/bootchart/
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Source code is hosted here: git://github.com/sofar/bootchart
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@@ -20,6 +20,17 @@
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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/***
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Many thanks to those who contributed ideas and code:
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- Ziga Mahkovec - Original bootchart author
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- Anders Norgaard - PyBootchartgui
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- Michael Meeks - bootchart2
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- Scott James Remnant - Ubuntu C-based logger
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- Arjan van der Ven - for the idea to merge bootgraph.pl functionality
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***/
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/resource.h>
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