[Buildroot] [PATCH] graph-build-time: generate graphs based on timing data

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Dear Yann E. MORIN,

On Fri, 27 Dec 2013 19:16:29 +0100, Yann E. MORIN wrote:
> From: "Yann E. MORIN" <yann.morin.1998@free.fr>
> 
> This script generates graphs of packages build time, from the timing
> data generated by Buildroot in the $(O)/build-time.log file.
> 
> Example usage:
> 
>   cat $(O)/build-time.data | \
>       ./support/scripts/graph-build-time \
>       --type=histogram --output=foobar.pdf

Just like the dependency graph tool, I'm wondering if we shouldn't try
to integrate this as a make target, to give it more visibility. This
can of course be done at a later stage.

> Three graph types are available :
> 
>   * histogram, which creates an histogram of the build time for each
>     package, decomposed by each step (extract, patch, configure,
>     etc.). The order in which the packages are shown is
>     configurable: by package name, by build order, or by duration
>     order. See the --order option.
> 
>   * pie-packages, which creates a pie chart of the build time of
>     each package (without decomposition in steps). Packages that
>     contributed to less than 1% of the overall build time are all
>     grouped together in an "Other" entry.
> 
>   * pie-steps, which creates a pie chart of the time spent globally
>     on each step (extract, patch, configure, etc...)
> 
> The default is to generate an histogram ordered by package name.
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> [yann.morin.1998 at free.fr: adapt to the format of the step-hooks build-time.log,
>                           add sort order by name]
> Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
> ---
> 
> So, this is a respin of Thomas' scripts from more than two years ago, that
> I adapted to the new build-time.log format we now have with step-hooks.
> 
> I have put a few graphs on-line:
>     http://ymorin.is-a-geek.org/download/tmp/buildroot/graphs/matplotlib/
> 
> For comparisson, some I made with gnuplot:
>     http://ymorin.is-a-geek.org/download/tmp/buildroot/graphs/gnuplot/
> 
> To be honnest, I prefer the graphs made with gnuplot, but it is mostly
> because of the colors (hey, Thomas, are you colorblind? ;-p)

I'm not colorblind. To me, the histogram colors look nice (they are
defined in the script). The colors for the pie charts are horrible, but
I believe they are automatically chosen by matplotlib, no?

Feel free to improve the colors :)

> But since this script is cleaner (much, much cleaner) than what I was able
> to get with gnuplot, I won't even try to submit my gnuplot scripts... :-/
> 
> ---
>  support/scripts/graph-build-time | 273 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 273 insertions(+)
>  create mode 100755 support/scripts/graph-build-time

Thanks a lot for submitting this!

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com