On Fri, 4 Jan 2019 at 10:21, Jeroen Demeyer <j.deme...@ugent.be> wrote:
> On 2019-01-04 10:22, John Cremona wrote:
> > Some of the runs I have been doing use a large amount of RAM and some
> > fail
>
> "fail" in which sense? I assume you mean a PariError saying that the
> stack overflowed but I can only guess...
>
Yes, that's right. Sorry not to be more explicit.
>
> > One is suppose to be able to increase this using the following syntax
> > sage: pari.default('parisizemax', 12000000000)
> > but that raises a run-time error
>
> That error is actually a PARI "feature". It's one of the many curious
> implementation details of the PARI stack. The idea is that you shouldn't
> change the stack size during a computation. So the error forces the
> running computation to abort.
>
> In GP this error is silenced but you can still see its effect:
>
> gp> a=1; default(parisizemax, 1000000000); a=2
> *** Warning: new maximum stack size = 1000001536 (953.676 Mbytes).
> gp> a
> %2 = 1
>
> Note that the "a=2" is not executed!
>
> Now to solutions: I would recommend using pari.allocatemem(sizemax=N) to
> change the stack size. That is handled a lot better by cypari2.
>
I will try that. However the last time this happened was after about 5
days of computation so testing is not so easy.
Thanks,
John
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