Thursday, 14 July 2016

Re: Current Launchpad builder layout and plans

On Tue, Oct 27, 2015 at 05:33:43PM +0000, Colin Watson wrote:
> 2015-10: Ubuntu ppc64el builds switched to ScalingStack and PPAs
> enabled [2]; arm64/armhf undergoing testing
[...]
> The next major change will be to switch arm64 over to ScalingStack; this
> is being tested at the moment.

As of today, all arm64/armhf builds are being dispatched to
ScalingStack. This means that behaviour between PPAs and Ubuntu builds
should be consistent again, and we should no longer have to manually
balance builders between the two pools based on load.

armhf is now being built in 32-bit chroots on 64-bit VMs (with a kernel
parameter to tweak what "uname -m" says), which are generally rather
faster than the older Highbank systems, and the running kernel version
is currently 4.2 rather than 3.2 as armhf had before. I've already seen
a few packages succeed where they previously failed (dumb-init,
haskell-openglraw).

We did try to upgrade these builders from wily to xenial before flipping
this switch, but we ran into what looks like
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1602577. Help from
kernel hackers would be appreciated, since we'd really prefer to be
running an LTS release.

--
Colin Watson [[email protected]]

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