Re: Sieve of Erastosthenes optimized to the max

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Sujet : Re: Sieve of Erastosthenes optimized to the max
De : tr.17687 (at) *nospam* z991.linuxsc.com (Tim Rentsch)
Groupes : comp.lang.c++
Date : 02. Jul 2024, 07:20:27
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <86zfr0b9hw.fsf@linuxsc.com>
References : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
User-Agent : Gnus/5.11 (Gnus v5.11) Emacs/22.4 (gnu/linux)
Vir Campestris <vir.campestris@invalid.invalid> writes:

On 19/06/2024 01:34, Tim Rentsch wrote:
>
Would you mind if I asked you to post the code so I can
take a look at it?  Or if you would rather email it to
me that also works.
>
I've hacked out all my include files, added a GPL licence, and
included build instructions.  It follows in the signature block.
600 lines :(
>
I bet the line wrapping breaks it too.

I got the code.  There were some line wrappings but I just went
through and fixed those by hand.  After fixing the problem line
wraps I was able to compile and run the code (I used std=c++17,
which apparently works okay).  I did a simple check to make sure
the primes being found are right, which they do indeed seem to
be.  I haven't really experimented with changing the code;  I
only just ran it with various bounds on what primes to find,
mostly to get a sense of the performance.

I admit I don't understand the scheme the code is using.  It
looks to me like the code is doing divisions and remainders a
lot, which my code basically doesn't do at all (it does do one
division for each prime up to the square root of the limit of
primes being sought, but that's all).  I know the big template
near the beginning is crucial to understanding what the code is
doing, but I haven't been able to figure out what abstraction
that template is supposed to represent.  The core of my program
is between 50 and 60 lines, and all pretty straightforward.

Is there some suggestion you could make or a question you would
like to ask?  What can I do that might be helpful?

Date Sujet#  Auteur
30 Jun 24 * Re: Sieve of Erastosthenes optimized to the max54Vir Campestris
2 Jul 24 `* Re: Sieve of Erastosthenes optimized to the max53Tim Rentsch
2 Jul 24  +- Re: Sieve of Erastosthenes optimized to the max1Vir Campestris
3 Jul 24  `* Re: Sieve of Erastosthenes optimized to the max51Vir Campestris
15 Jul 24   +- Re: Sieve of Erastosthenes optimized to the max1Tim Rentsch
20 Jul 24   +* Re: Sieve of Erastosthenes optimized to the max48Tim Rentsch
25 Jul 24   i`* OT: Re: Sieve of Erastosthenes optimized to the max47Vir Campestris
10 Aug 24   i +* Re: OT: Re: Sieve of Erastosthenes optimized to the max44Tim Rentsch
12 Aug 24   i i+* Re: OT: Re: Sieve of Erastosthenes optimized to the max2Vir Campestris
16 Aug 24   i ii`- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Tim Rentsch
15 Aug 24   i i`* Re: OT: Re: Sieve of Erastosthenes optimized to the max41Vir Campestris
16 Aug 24   i i `* Re: OT: Re: Sieve of Erastosthenes optimized to the max40Tim Rentsch
16 Aug 24   i i  +* Re: OT: Re: Sieve of Erastosthenes optimized to the max38Bonita Montero
16 Aug 24   i i  i+- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Bonita Montero
19 Aug 24   i i  i+* Re: OT: Re: Sieve of Erastosthenes optimized to the max19Vir Campestris
20 Aug 24   i i  ii`* Re: OT: Re: Sieve of Erastosthenes optimized to the max18Bonita Montero
20 Aug 24   i i  ii `* Re: OT: Re: Sieve of Erastosthenes optimized to the max17Bonita Montero
20 Aug 24   i i  ii  +- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Bonita Montero
20 Aug 24   i i  ii  `* Re: OT: Re: Sieve of Erastosthenes optimized to the max15Vir Campestris
20 Aug 24   i i  ii   +- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Bonita Montero
26 Aug 24   i i  ii   `* Re: OT: Re: Sieve of Erastosthenes optimized to the max13Tim Rentsch
27 Aug 24   i i  ii    `* Re: OT: Re: Sieve of Erastosthenes optimized to the max12Bonita Montero
1 Sep 24   i i  ii     `* Re: OT: Re: Sieve of Erastosthenes optimized to the max11Vir Campestris
2 Sep 24   i i  ii      `* Re: OT: Re: Sieve of Erastosthenes optimized to the max10Tim Rentsch
2 Sep 24   i i  ii       +- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Bonita Montero
3 Sep 24   i i  ii       `* Re: OT: Re: Sieve of Erastosthenes optimized to the max8Vir Campestris
28 Sep 24   i i  ii        `* Re: OT: Re: Sieve of Erastosthenes optimized to the max7Tim Rentsch
28 Sep 24   i i  ii         `* Re: OT: Re: Sieve of Erastosthenes optimized to the max6Keith Thompson
2 Oct 24   i i  ii          `* Re: OT: Re: Sieve of Erastosthenes optimized to the max5Vir Campestris
2 Oct 24   i i  ii           +- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Bonita Montero
7 Oct 24   i i  ii           `* Re: OT: Re: Sieve of Erastosthenes optimized to the max3Tim Rentsch
20 Oct 24   i i  ii            `* Re: OT: Re: Sieve of Erastosthenes optimized to the max2Vir Campestris
4 Nov 24   i i  ii             `- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Tim Rentsch
19 Aug 24   i i  i+* Re: OT: Re: Sieve of Erastosthenes optimized to the max12Vir Campestris
20 Aug 24   i i  ii+* Re: OT: Re: Sieve of Erastosthenes optimized to the max4red floyd
20 Aug 24   i i  iii+* Re: OT: Re: Sieve of Erastosthenes optimized to the max2Vir Campestris
26 Aug 24   i i  iiii`- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Tim Rentsch
26 Aug 24   i i  iii`- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Tim Rentsch
20 Aug 24   i i  ii+* Re: OT: Re: Sieve of Erastosthenes optimized to the max3Bonita Montero
20 Aug 24   i i  iii+- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Bonita Montero
20 Aug 24   i i  iii`- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Bonita Montero
20 Aug 24   i i  ii`* Re: OT: Re: Sieve of Erastosthenes optimized to the max4Bonita Montero
22 Aug 24   i i  ii `* Re: OT: Re: Sieve of Erastosthenes optimized to the max3Vir Campestris
22 Aug 24   i i  ii  `* Re: OT: Re: Sieve of Erastosthenes optimized to the max2Bonita Montero
22 Aug 24   i i  ii   `- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Vir Campestris
22 Aug 24   i i  i`* Re: OT: Re: Sieve of Erastosthenes optimized to the max5Vir Campestris
23 Aug 24   i i  i +* Re: OT: Re: Sieve of Erastosthenes optimized to the max3red floyd
26 Aug 24   i i  i i+- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Tim Rentsch
28 Sep 24   i i  i i`- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Andrey Tarasevich
26 Aug 24   i i  i `- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Tim Rentsch
19 Aug 24   i i  `- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Tim Rentsch
11 Aug 24   i +- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Tim Rentsch
11 Aug 24   i `- Re: OT: Re: Sieve of Erastosthenes optimized to the max1Tim Rentsch
23 Jul 24   `- Re: Sieve of Erastosthenes optimized to the max1Tim Rentsch

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