Int64 is emulated on 32 bit. So it is not as efficient by a long shot. On Thursday, 28 March 2013, Branimir Maksimovic wrote:
> I have posted previous knucleotide program, it is fast on 64 bit but > very slow on 32 bit. > I cannot install 32 bit ghc to test it so I can only guess is that > cause is use of Int64 for hash and HashMap array indexing. > What bothers me is that it that much slower , and I guess > that array indexing of 64 bit int where native index is 32 bit > is culprit. > Am I right? If I make Int index of array it will be fast on > 32 bit platform too? > I cannot imagine that hashing to 64 bit int is culprit rather > array indexing as I guess that every array access > requires indirect access on 32 bit platform? > > 64 bit : > > http://benchmarksgame.alioth.debian.org/u64q/program.php?test=knucleotide&lang=ghc&id=1 > 19.80 secs > 32 bit: > > http://benchmarksgame.alioth.debian.org/u32q/program.php?test=knucleotide&lang=ghc&id=1 > 91.01 secs ;( > > I really like Haskell, but Im frustrated as how inpredictable it is. > Im programming from 1983' but found Haskell as much more difficult > to program efficiently than C++. > In C++ whatever lousy program I write it performs decently, > but not so in Haskell. It requires much deeper knowledge than > c++. > > > >
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