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Re: Boot poster challenge



man, 15.11.2004 kl. 23.24 skrev Ziga Mahkovec:
> On Sat, 2004-11-13 at 12:18 -0500, Owen Taylor wrote:
> > It should be possible to start with a limited set of easily collected
> > data and already get a useful picture. Useful data collection could be
> > as simple as taking a snapshot of the data that the "top" program
> > displays a few times a second during boot. That already gives you a
> > list of the running processes, their states, and some statistics about
> > global system load.
> 
> So I gave this a try:
> 
> 1. I modified the boot procedure so that early in rc.sysinit, a tmpfs is
> mounted and top is run in batch mode (to output every 0.2 seconds).  The
> logged output is later parsed only up to the point where gdmgreeter is
> running and the system is relatively idle (i.e. boot complete and ready
> for login).
> 
> 2. A Java program parses the log file, builds the process tree and
> finally renders a PNG chart.  Processes are sorted by PID and traversed
> depth first.
> 
> This still needs more work but here's a sneak preview:
> http://www.klika.si/ziga/bootchart/bootchart.png
> 
> (as a result of http://www.klika.si/ziga/bootchart/bootop.log.gz )
> 
> Some processes were filtered out for clarity -- mostly sleepy kernel
> processes and the ones that only live for the duration of a single top
> sample.  This skews the chart a bit but is definitely more
> comprehensible (compare with
> http://www.klika.si/ziga/bootchart/bootchart-complete.png ).
> 
> Some things I plan on adding:
> - start logging earlier in the boot process (possibly in initrd),
> - add additional layers (e.g. make use of the kernel patch Arjan
> suggested for showing the number of open files),
> - improve process tree representation and add dependency lines,
> - render SVG instead, for scalability and interactivity.
> 
> This definitely helped me with my boot times -- the 4-second load gap at
> the start I found to be "modprobe floppy", apparently timing out on my
> floppyless laptop :)
> 
> 

Ah! that's why the floppy ligth flashes during "kudzu" (at the end of
it) :)

> Any ideas or comments are welcome,
> -- 
> Ziga


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