[GHC] #15022: Stackage HEAD detected a suspicious change

[GHC]

#15022: Stackage HEAD detected a suspicious change
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        Reporter:  mrkkrp            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by mboes):

 Replying to [comment:9 nomeata]:
 > > The build takes about one hour.
 >
 > Wow, that’s much less than I thought.

 It's only building a bit more than half of all Stackage Nightly right now,
 because 5 packages currently fail and those are dependencies for the rest.
 We expect that all told, on the "xlarge" CircleCI machine types, a full
 Stackage build should take around 2 hours. That's just an extrapolation
 though. Reality might be quite a bit worse (or better).

 > that’s faster than `perf.haskell.org`… Can we run it on every commit
 then?
 >
 > Or, maybe a bit less wasteful: Run it every few hours, but if there is a
 difference, then automatically schedule additional runs of the commits in
 between to bisect the change?

 It's currently set at running every 6 hours, and only using GHC master.
 But I agree, running it at every commit could well be viable. Let's
 iterate on this as we get more experience using it. :)

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15022#comment:13>
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