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MathGroup Archive 2007

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Re: FactorInteger slow in V6.0 vs V5.2

  • To: mathgroup at smc.vnet.net
  • Subject: [mg81143] Re: FactorInteger slow in V6.0 vs V5.2
  • From: j.f.b.payne at tesco.net
  • Date: Fri, 14 Sep 2007 03:29:12 -0400 (EDT)
  • References: <fcb37e$fba$1@smc.vnet.net>

On 13 Sep, 11:25, Mark Fisher <particlefil... at gmail.com> wrote:
> In version 5.2 the following runs pretty fast (not more than a couple
> of minutes)
>
> FactorInteger[2^227-1]
>
> but quite slow in version 6.0 (I'm not sure how long). Any ideas as to
> why?
>
> --Mark

??? I get ~1200seconds on both version 5.2 and version 6 (Linux,
AMD64, ~4GHz)
from
Timing[FactorInteger[2^227-1];]

So the speed looks no different to me, and you're v5.2 speed looks
incorrect (unless you've got a 10 times faster machine than me)

John



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