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Date: Wed, 18 Mar 2020 16:49:06 +0200
From: "Adrian Bunk" <bunk@stusta.de>
To: Jean-Marie Lemetayer <jean-marie.lemetayer@savoirfairelinux.com>,
	Paul Barker <pbarker@konsulko.com>,
	Mikko Rapeli <mikko.rapeli@bmw.de>,
	oliver westermann <oliver.westermann@cognex.com>,
	yocto@lists.yoctoproject.org,
	embedded-discuss <embedded-discuss@lists.savoirfairelinux.net>
Subject: Re: [yocto] What are the key factors for yocto build speed?
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On Wed, Mar 18, 2020 at 10:12:26AM -0400, Jean-Marie Lemetayer wrote:
>...
> For example one of our build servers is using:
> - AMD Ryzen 9 3900X
>...
> - 32Go DDR4 3200 MHZ CL14
>...
> It is a really good price / build time ratio configuration.

Depends on what you are building.

Building non-trivial C++ code (e.g. webkitgtk) with 24 cores
but only 32 GB RAM will not work, for such code you need
more than 2 GB/core.

On Wed, Mar 18, 2020 at 05:52:37AM -0700, Oliver Westermann wrote:
>...
> Any suggestions what to put in that build to get the most out of it?
> 
> Currently we're looking at a big Ryzen, 64G of RAM and one or multiple 
> SSDs on a "consumer grade" board like the X570.
>...

I would buy 128 GB RAM to not run into problems due to lack of RAM,
and Linux will also automatically use unused RAM as disk cache.

As long as you aren't running out of RAM or disk space all that matters 
is CPU speed, Ryzen 9 3950X with 128 GB RAM would be my choice unless 
you are on a tight budget.

cu
Adrian