8.2 and earlier build times

[Ben Gamari]

Ben Gamari <ben at smart-cactus.org> writes:

snip
>
> The "normal" and "profiled" build metrics are the +RTS -t lines extract
> from Cabal's profiled and unprofiled GHC invocations. I believe the
> RTS timings for 8.0.2 are broken due to a (fixed) RTS bug, although I
> can't come up with a reference at the moment.
>
>
I tried this again with regex-tdfa-1.2.2 and indeed I was able to
reproduce Herbert's result,


8.0.2
    normal:   <<ghc: 91199006664 bytes, 3573 GCs, 260839393/610327968 avg/max bytes residency (30 samples), 1687M in use, 0.000 INIT (0.001 elapsed), 0.319 MUT (49.441 elapsed), 0.858 GC (30.681 elapsed) :ghc>>
    profiled: <<ghc: 73210356144 bytes, 3333 GCs, 225266643/599801320 avg/max bytes residency (26 samples), 1731M in use, 0.000 INIT (0.001 elapsed), 0.352 MUT (39.318 elapsed), 0.685 GC (21.644 elapsed) :ghc>>

8.2.1-rc2:
    normal:   <<ghc: 90928069104 bytes, 3655 GCs, 256129517/594585536 avg/max bytes residency (29 samples), 1691M in use, 0.000 INIT (0.001 elapsed), 1.137 MUT (84.652 elapsed), 0.941 GC (47.811 elapsed) :ghc>>
    profiled: <<ghc: 73010065480 bytes, 3228 GCs, 225992177/578697488 avg/max bytes residency (27 samples), 1649M in use, 0.000 INIT (0.001 elapsed), 0.318 MUT (53.871 elapsed), 0.728 GC (32.681 elapsed) :ghc>>  

We'll need to look at what is going on here as this is a pretty
significant regression.

Cheers,

- Ben
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