[Haskell-cafe] Speeding up trivial programs

[Brandon Allbery]

I think there's already a ticket for slow RTS startup, although I didn't
find it on a quick search, and that time looks similar to the examples I
saw (around a tenth of a second).

On Fri, Aug 23, 2024 at 2:50 PM amindfv--- via Haskell-Cafe <
haskell-cafe at haskell.org> wrote:

> I'm working on a small program that has to run many, many times, as
> quickly as possible (yes, it needs to be a standalone program).
>
> I've optimized it in many ways, but I seem to have a time floor,
> observable with "Hello, world"
>
>
>     $ cat Hello.hs
>     main = putStrLn "Hello world"
>     $ ghc -O2 Hello.hs
>     $ time ./Hello
>     Hello world
>
>     real    0m0.150s
>     user    0m0.117s
>     sys     0m0.032s
>
>
> The equivalent program in C takes only 0.002s (75x faster).
>
> What is taking the extra time? Is it the RTS "booting"? Is there any way
> to speed this up?
>
> Thanks,
> Tom
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-- 
brandon s allbery kf8nh
allbery.b at gmail.com
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