Launchpad builders - increasing memory spec

[James Page]

Hi All

Mathias and I where discussing some challenges around fitting the Ceph
build with any level of parallelism in to a virtualized launchpad builder
(as used for the majority of architectures today).

Basically the current memory spec only permits a max-parallel of 2 (on
Xenial amd64).  Ceph is a big C++ project so takes some time to build with
such a low level of parallelism.

Would it be possible to nudge up the default memory allocation on the
builders? I use a 16G machine for test builds of i386/amd64 and I've not
seen any memory exhaustion with parallel=8.

Or maybe have a mechanism to allow a source package to request a higher
spec of builder?

Thoughts?

James
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