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Re: Will Math.random return 0.0?

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On 7/16/2016 3:39 PM, Martin Gregorie wrote:
> [...]
> Meanwhile, your original code had been running for a while before I
> developed and played with my extended version and has currently used
> 100.5 minutes of MPU time, which is close to 1 hour 40 since its using
> between 99 and 100% of the available CPU time from one of the two cores.
> This is running on a laptop powered by a 1.6 GHz Core Duo with 3GB of RAM
> and running Fedora 23 Linux.
>
> My billion sample run took 132 seconds to run, or 7.6 million samples
> were generated and analysed per second.
>
> I'll leave your code running to see if it stops any time thus evening.

     Back of the envelope: 2^53 possible numerators (maybe), one of
which is all zero.  7.6 million ~= 2^23 samples per second.  Time to
cycle through all numerators ~= 2^(53-23) ~= 1E9 seconds, which is
just about thirty-four years.  Maybe only half that if we leave out
the analysis, so you should have a definite conclusion by 2033 or so.
And maybe you'll only need to get half way through the full cycle to
hit pay dirt, so I'll pencil you in for, um, 2025.

-- 
esosman@comcast-dot-net.invalid
"Don't be afraid of work. Make work afraid of you." -- TLM

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Re: Will Math.random return 0.0? Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-16 19:39 +0000
  Re: Will Math.random return 0.0? Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-07-16 16:12 -0400
    Re: Will Math.random return 0.0? Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-16 20:32 +0000
      Re: Will Math.random return 0.0? Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-17 08:00 +0000
    Re: Will Math.random return 0.0? Arne Vajhøj <arne@vajhoej.dk> - 2016-07-16 16:47 -0400
    Re: Will Math.random return 0.0? Marcel Mueller <news.5.maazl@spamgourmet.org> - 2016-07-17 01:03 +0200

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