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Re^3: Irrational numbers

by Anonymous Monk
on Dec 18, 2012 at 15:05 UTC ( #1009390=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Irrational numbers
in thread Irrational numbers

It might indeed have a big cost in performance, though it's not so obvious.

You are competing against something that the hardware can do in as little as one cpu cycle. No matter what you do, it will have a huge performance penalty, percentage wise.


Comment on Re^3: Irrational numbers
Re^4: Irrational numbers
by BrowserUk (Pope) on Dec 18, 2012 at 16:04 UTC
    You are competing against something that the hardware can do in as little as one cpu cycle.

    It is actually much worse than that these days. Most physical simulation games lend themselves very nicely to being programmed for GPUs, in which case he would be competing with not just 1 FP calc per cycle, but dozens or even hundreds of FP multiply-add calculations per cycle.

    And a single call to his closure-based lazy irrationals would take hundreds of cycles per digit.

    Even if he dropped into C and avoided Perl's sub call overheads; calculating each digit using a polynomial -- Taylor series or similar -- will still take dozens of cycles.

    We are talking 2 or 3 (even 4!) orders of magnitude slower calculations in order to achieve accuracy that simply isn't required.


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    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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