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...
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.
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