Re: tech parameter for bnfinit

[Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>]

On Sun, Sep 06, 2020 at 03:08:07PM -0500, Alexey Beshenov wrote:
> Dear PARI/GP users,
> 
> The documentation advises against using the parameter tech for
> bnfinit, but I believe it can speed up drastically some calculations.
> Could someone explain how to set this parameter properly to calculate
> something like
>   bnfinit(polcyclo(89))
> efficiently?

Well, according to my log, it only takes a bit more than 1 hour with the
standard setting.

The tech option is unlikely to help.

The parameters that sometime help are

static const long BMULT = 8;
static const long maxtry_ELEMENT = 1000*1000;
static const long maxtry_DEP = 20;
static const long maxtry_FACT = 500;

in src/basemath/buch2.c but they cannot be set via tech.

Cheers,
Bill