On Sun, Jun 01, 2008 at 01:46:43PM -0700, Don Stewart wrote:
Hello Serge,
I was looking at the cabal file used to build docon, I note the current flags are:
ghc-options: -fglasgow-exts -fallow-overlapping-instances -fallow-undecidable-instances -fno-warn-overlapping-patterns -fwarn-unused-binds -fwarn-unused-matches -fwarn-unused-imports -O +RTS -M400m -RTS
Do you gain any performance benefit using:
-O2 -fvia-C -optc-O2
I'm wondering.
I tried -O2 -fvia-C -optc-O2, together with making the very test (demotest/Main) under -O. In ghc-6.8.2 this does not gain anything in DoCon in comparison to -O, it makes things worse: * the speed of running the test preserves, * making the DoCon library becomes 4 times slower, * the library code becomes 10% larger, * making the test module becomes ? times slower, Concerning the speed of running the test, maybe -O2 does not help because DoCon uses Integer everywhere instead of Int, I do not know. I do not apply -O2 in making the test because this takes too much of time (hours, more than 50 times more than -Onot), and also because this would not increase perforamance, because all the time consuming inner loops are in the library, not in the test.
Also, would you be interested in releasing the cabal bundle for docon on hackage.haskell.org , so it can be easily installed by others?
Could you explain me, why currently DoCon is not easy to install? I thought, install.txt provides a short instruction which is easy to follow. What is difficult there, what could be improved? What is a cabal bundle? DoCon has the file docon.cabal. Is not this a cabal bundle? Regards, ----------------- Serge Mechveliani mechvel@botik.ru