On Sep 12, 10:37 pm, "William Stein" <[EMAIL PROTECTED]> wrote:
> On 9/12/07, mabshoff <[EMAIL PROTECTED]> wrote:
>
>
>
>
>
> > Kate Minola wrote:
> > > FYI - the following have recently
> > > been released:
>
> > > gmp-4.2.2
> > > mpfr-2.3.0
> > > ecm-6.1.3
>
> > > Kate
>
> > Hello Kate,
>
> > #541, #542 and #642 in sagetrac respectively. I have to admit that I
> > added #642 only two hours ago. I expect that I will spend some time on
> > those tickets during Bug Day 3 (probably the 20th of September)
>
> Yep. However, one thing I want to add is that my understanding
> is that the GPL-only patches that make xgcd/gcd *vastly* faster
> for large numbers might only work with gmp-4.2.1, at least
> without a lot more work to port it, and if so we should wait
> for that patch to be updated (especially if gmp-4.2.2 is merely
> a build improvement over gmp-4.2.1). This sort of thing is
> just really cool:
>
> BEFORE the patch:
> sage: k=2000000; n = QQ.random_element(2^k); m=QQ.random_element(2^k)
> sage: time a=n+m
> CPU times: user 5.69 s, sys: 0.24 s, total: 5.93 s
>
> AFTER the patch:
> sage: k=2000000; n = QQ.random_element(2^k); m=QQ.random_element(2^k)
> sage: sage: time a=n+m
> CPU times: user 0.99 s, sys: 0.00 s, total: 0.99 s
> sage: len(str(n))
> 1204120
>
> Having fast arithmetic with million digits rational numbers can be really
> important...
>
:)
I consider the gmp update the tricky one. ecm should be straight
forward. I was concerned about mpfr but according to the SPKG.txt in
the current mpfr.spkg it is the "vanilla" distribution. I dropped in
mpfr-2.3.0 in a couple sage installations for fun last week and "-
testall" with the new release passed on all of them. So we might take
care of ecm and mpfr soon and sort out the gmp issues later.
> Presumably mpfr and ecm would both work with gmp-4.2.1 if we have
> to stay with it for some amount of time.
>
> -- William
Cheersm
Michael
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