RFC: Primary architecture promotion requirements

[Jaroslav Reznik]

----- Original Message -----

> Maybe it's worth to ask them (or look at for example Mer builds)
> what's
> the difference in build times.

A few statistics from build.meego.com - using the OBS and building in
qemu. These are really just approximate numbers, built in different
times with probably a different load...

I took Qt as an example as it's a package I know.

------ build.meego.com -------
http://build.meego.com/package/show?package=qt&project=Trunk
armv8el
build19 started "build qt.spec" at Sat Nov  5 02:09:33 UTC 2011.
build19 finished "build qt.spec" at Sat Nov  5 03:01:43 UTC 2011.

approx. 1 hour

i586
build17 started "build qt.spec" at Fri Nov  4 23:33:24 UTC 2011.
build17 finished "build qt.spec" at Sat Nov  5 00:05:03 UTC 2011.

approx. half hour (1/2)

armv8el vs i586 factor of 2

http://build.meego.com/package/show?package=qt&project=home%3Arrojfors%3Abranches%3AMeeGo%3A1.1%3ACore
armv7el
build42 started "build qt.spec" at Thu May 12 08:49:50 UTC 2011.
build42 finished "build qt.spec" at Thu May 12 10:42:21 UTC 2011.

approx. 2 hours

i586
build11 started "build qt.spec" at Thu May 12 08:49:48 UTC 2011.
build11 finished "build qt.spec" at Thu May 12 09:09:47 UTC 2011.

approx.

armv7el vs i586 factor of 4


------ Fedora ------
i686
2012-02-20 14:31:51,510 - Mock Version: 1.1.18
2012-02-20 15:05:21,089 - State Changed: end

approx. half hour

armv7hl
2012-03-18 17:58:09,566 - Mock Version: 1.1.18
2012-03-19 04:53:07,593 - State Changed: end

better not calculating...

So probably using Qemu could speed it up quite a lot. Also OBS offers
quite a lot of flexibility to decouple arch builds, disable selected
archs etc. But I'm not sure about the processes for chain builds,
updates, how they make the builds consistent (if one arch fails)...