Commits on Sep 24, 2023

1. Use flat for .ty serialization …

   This switches the serialization and deserialization format for our .ty
   files to use the flat library. Flat is one of the fastest serialization
   formats out there and it does indeed provide a speedup for Acton as
   well.
   
   Unfortunately, I started this work based on a vague memory I had of
   having seen that reading the .ty files took up a significant portion of
   total compilation time, in particular when a lot of files are just
   cached / up to date... and so I set out to speed it up. After having
   implemented flat, I see that I misremembered. Reading .ty files is
   actually very fast, the largest one I have takes 4ms. Using flat we cut
   that in half, down to 2ms. If I turn off zlib compression we can get it
   down to 1ms but at the expense of quite a lot larger files (like 4-5x).
   
   The files are about 30% larger with flat than before, but since we're on
   KB or tens of KB level here, that's not much of a deal. A 100% increase
   in speed is worth slightly larger files on disk. If we want ever more
   sp33d, we can consider removing zlib.

   

   plajjan committed Sep 24, 2023
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