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