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).
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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