Re: OT: Re: Sieve of Erastosthenes optimized to the max

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Sujet : Re: OT: Re: Sieve of Erastosthenes optimized to the max
De : tr.17687 (at) *nospam* z991.linuxsc.com (Tim Rentsch)
Groupes : comp.lang.c++
Date : 26. Aug 2024, 20:08:11
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <86v7zn3xwk.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 20/08/2024 16:24, Bonita Montero wrote:
>
Am 20.08.2024 um 17:21 schrieb Bonita Montero:
>
Am 19.08.2024 um 22:23 schrieb Vir Campestris:
>
On 16/08/2024 18:35, Bonita Montero wrote:
<snip>
>
But basically I don't think it is a good idea to skip numbers
exept multiples of two.  [...] I think this extra computation
is higher than the time for the saved memory loads.

[...]

I'm leaning towards thinking you may have a point on the mod30
code.  There are more operations on the innermost loop with mod30,
although the loop goes around fewer times.  It also means that the
store is forced to be byte wide - I find that my original odd-only
code is significantly faster - about 30% - when the store is 64
bit wide rather than byte.  [...]

One motivation for choosing a mod30 representation is being able to
compute more primes -- almost twice as many.  Any machine with 64GB
of memory should be able to compute primes up to 1.5 trillion.
Even if an odds-only representation runs faster for more limited
sizes (and I'm not yet convinced that it does), it doesn't matter
if it's faster, because it doesn't do the job.  I was computing all
32-bit primes 20 years ago, back when 32-bit machines were a thing.
The challenge for today's world is correspondingly higher.

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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