For what it’s worth, I’ve never found phab / arc to be the bottle neck / actual time consuming piece of doing anything for ghc 

It’s defintely the nicest code review substrate I’ve engaged with 

One question I have : how does the llvm org manage / handle their phabricator instance and or ci substrate. Maybe they have wisdom that can help ?

On Thu, Nov 1, 2018 at 7:27 PM Vladislav Zavialov <vladislav@serokell.io> wrote:
To put my 2¢ – I will be happy with whatever service provides the most
reliable CI.

In terms of workflow, I like Ben's suggestion:

  * Consider a PR to be a stack of differentials, with each commit
being an atomic change in that stack.
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