[Haskell-cafe] GHC profiling overhead

Kolář Dušan kolar at fit.vutbr.cz
Tue Feb 25 17:18:50 UTC 2020

Dear Café,

I'm quite curious about overhead of the profiler...
I've compiled my program with --make -threaded -rtsopts -O2 -prof 
It was started with +RTS -N5 -p

Usually, the program evaluates like 6-7 hours of real time. What is the 
overhead of the profiling? After 8 hours of working, the program has not 
finished yet. I've looked over the Internet and it seems like the 
overhead may be 25 times slowdown and even worse. Is it true? If yes, 
it's not worth waiting then :-)

Best regards,

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