Perf notes

[David Eichmann]

> I thought that wasn’t possible.  Isn’t  that what CI is **for**?

Yes we run CI on MRs, but once merged into master CI is run again. It's 
only those metrics from CI on master (post merge) that are ultimately 
uploaded / used as a baseline.

Re the doubling of bytes-allocated on T9803, that's a good point. Due to 
the recent change in RSA keys, CI is recently failing to upload metrics 
(e.g. [1])! I'll fix that then see if I can track down where / if the 
metric has really regressed in master.


[1] "|fatal: Could not read from remote repository." | 
https://gitlab.haskell.org/ghc/ghc/-/jobs/378487

-- 

David Eichmann, Haskell Consultant
Well-Typed LLP, http://www.well-typed.com

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