Re: [Buildroot] [PATCH] utils/genrandconfig: reduce the maximum "size" of random configurations

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

On Sun, 14 Nov 2021 13:48:43 +0100
Peter Korsgaard <peter@korsgaard.com> wrote:

> >>>>> "Thomas" == Thomas Petazzoni <thomas.petazzoni@bootlin.com> writes:  
> 
>  > genrandconfig is used by the Buildroot autobuilders to generate
>  > semi-random configurations that we build test. As part of this, we use
>  > "make randpackageconfig" to randomize the selection of packages,
>  > together with a KCONFIG_PROBABILITY value, which indicates the
>  > probabibility for each option to be enabled. This probability is
>  > itself randomized, between 1% and 30% for every build.  
> 
>  > However, with our increasing number of packages (over 2900), when we
>  > use a 30% probability for options to be enabled, it means a *lot* of
>  > options are enabled, causing very large configurations to be
>  > tested. These configurations are not very realistic, and they take
>  > ages to build on our autobuilders: we have builds that take 4, 5 or
>  > even 7 hours to build.  
> 
>  > In order to test a larger number of configurations and therefore a
>  > larger variety of configurations, this commit reduces the maximum
>  > probability to 20%.  
> 
>  > Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>  
> 
> Makes sense. Committed, thanks.

Thanks! I think we want it in all branches currently tested by the
autobuilders, i.e master, next, 2021.02.x and 2021.08.x.

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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