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<body class='hmmessage'><div dir='ltr'>I have posted previous knucleotide program, it is fast on 64 bit but<div>very slow on 32 bit.</div><div>I cannot install 32 bit ghc to test it so I can only guess is that</div><div>cause is use of Int64 for hash and HashMap array indexing.</div><div>What bothers me is that it that much slower , and I guess</div><div>that array indexing of 64 bit int where native index is 32 bit</div><div>is culprit.</div><div>Am I right? If I make Int index of array it will be fast on</div><div>32 bit platform too?</div><div>I cannot imagine that hashing to 64 bit int is culprit rather</div><div>array indexing as I guess that every array access</div><div>requires indirect access on 32 bit platform?</div><div><br></div><div>64 bit :</div><div><a href="http://benchmarksgame.alioth.debian.org/u64q/program.php?test=knucleotide&lang=ghc&id=1">http://benchmarksgame.alioth.debian.org/u64q/program.php?test=knucleotide&lang=ghc&id=1</a></div><div><span style="font-family: verdana, arial, sans-serif; font-size: 10pt; text-align: right; background-color: rgb(238, 238, 238);">19.80 secs</span></div><div><span style="font-family: verdana, arial, sans-serif; font-size: 10pt; text-align: right; background-color: rgb(238, 238, 238);">32 bit:</span></div><div><a href="http://benchmarksgame.alioth.debian.org/u32q/program.php?test=knucleotide&lang=ghc&id=1">http://benchmarksgame.alioth.debian.org/u32q/program.php?test=knucleotide&lang=ghc&id=1</a></div><div><span style="font-family: verdana, arial, sans-serif; font-size: 10pt; text-align: right; background-color: rgb(238, 238, 238);">91.01 secs ;(</span></div><div><span style="font-family: verdana, arial, sans-serif; font-size: 10pt; text-align: right; background-color: rgb(238, 238, 238);"><br></span></div><div><span style="font-family: verdana, arial, sans-serif; font-size: 10pt; text-align: right; background-color: rgb(238, 238, 238);">I really like Haskell, but Im frustrated as how inpredictable it is.</span></div><div><span style="font-family: verdana, arial, sans-serif; font-size: 10pt; text-align: right; background-color: rgb(238, 238, 238);">Im programming from 1983' but found Haskell as much more difficult</span></div><div><span style="font-family: verdana, arial, sans-serif; font-size: 10pt; text-align: right; background-color: rgb(238, 238, 238);">to program efficiently than C++.</span></div><div><span style="font-family: verdana, arial, sans-serif; font-size: 10pt; text-align: right; background-color: rgb(238, 238, 238);">In C++ whatever lousy program I write it performs decently,</span></div><div><span style="font-family: verdana, arial, sans-serif; font-size: 10pt; text-align: right; background-color: rgb(238, 238, 238);">but not so in Haskell. It requires much deeper knowledge than</span></div><div><span style="font-family: verdana, arial, sans-serif; font-size: 10pt; text-align: right; background-color: rgb(238, 238, 238);">c++.</span></div><div><span style="font-family: verdana, arial, sans-serif; font-size: 10pt; text-align: right; background-color: rgb(238, 238, 238);"><br></span></div><div><span style="font-family: verdana, arial, sans-serif; font-size: 10pt; text-align: right; background-color: rgb(238, 238, 238);"><br></span></div><div><br></div> </div></body>
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