Reproducibility and microcode updates

[Holger Levsen]

Hi Dan,

On Tue, Jun 22, 2021 at 11:50:37AM +0100, Dan Shearer wrote:
> Here at LumoSQL we do repeated runs testing SQLite of various versions
> and configurations, storing the results in an SQLite database. 
> 
> Here is an example of the kind of variation that justifies what some
> have called our too-fussy test suite, a microcode update that changes
> behaviour from one day to another:
> https://travisdowns.github.io/blog/2021/06/17/rip-zero-opt.html . We
> capture as much as we can about the build/test environment, but of
> course not the microcode version :-)

haha, oh dear, nice find and even nicer documentation of it! 

(and then it's really not *that* surprising to find different behaviour using a
different CPU ;) sigh too.)

> (Apologies if this has been posted here before, but I don't think so.)

indeed, thanks for sharing this here!


-- 
cheers,
	Holger

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