as for the "tip and tail" overhead, that's one place where I would say to use a amd64 machine, use it to unpack the tarball onto a network accessible drive and then package up the result. Ideally you do this on the machine providing the network accessible drive so that it's all local I/O.
This isn't going to scale linearly with the number of machines for any one package build, but there are a LOT of packages that need to be built, so overall you should be able to keep dozens, if not hundreds of cores busy.
Copyright © 2017, Eklektix, Inc.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds