Re: FactorInteger slow in V6.0 vs V5.2
- To: mathgroup at smc.vnet.net
- Subject: [mg81207] Re: FactorInteger slow in V6.0 vs V5.2
- From: Costa Bravo <laguna at aol.com>
- Date: Sat, 15 Sep 2007 04:17:34 -0400 (EDT)
- References: <fcb37e$fba$1@smc.vnet.net>
Mark Fisher write:
> 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?
j.f.b.payne at tesco.net wrote :
> I get ~1200seconds on both version 5.2 and version 6 (Linux,AMD64, ~4GHz)
> (unless you've got a 10 times faster machine than me)
sydgeraghty at mac.com wrote :
> $Version -> "6.0 for Mac OS X x86 (32-bit) (June 19, 2007)"
> MacBookPro2,1. Intel Core 2 Duo, 2.33 GHz
> Timing
> {984.557, {{26986333437777017,
> 1}, {7992177738205979626491506950867720953545660121688631, 1}}}
Results for my machine :
SVersion -> 5.1 Microsoft Windows , XP
Intel Pentium 4, Speed 3.0 GHz
Timing[FactorInteger[2^227-1]
{86.782 Second (*!!*), {{26986333437777017, 1},
{7992177738205979626491506950867720953545660121688631, 1}}}
Why such big differences are in timing ?
--
Costa