|Bill Allombert on Wed, 21 Jan 2015 22:32:09 +0100|
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|Re: Stack size bugs and parisizemax|
On Wed, Jan 21, 2015 at 09:52:19PM +0100, Karim Belabas wrote: > * Jeroen Demeyer [2015-01-21 08:59]: > > On 2015-01-20 23:55, Bill Allombert wrote: > > >Do you think supporting what you call 'desesparation mode' to be valuable ? > > >So far Karim and I have been less than convinced. > > In http://pari.math.u-bordeaux.fr/cgi-bin/bugreport.cgi?bug=1507#15, Karim > > clearly supported "desperation mode". But if you want to get rid of > > desperation mode completely, that would obviously a good (and simple) > > solution. > > Hum, yes I did. But we didn't have parisizemax back then ! I now think > we should only support "desperation mode" when parisize == parisizemax. > > I guess it's probably best to prevent garbage collection from internal > loops unless parisize = parisizemax, as you proposed. What about parisizemax = 0 ? And do you mean default(parisize) or the current stacksize (parimainstack->size) ? Also with unlucky choice of parisize and parisizemax, size == parisizemax might never happen: we might go from size < parisizemax to stack overflow in one go. (e.g. set parisize to 1G and parisizemax to 4G: parisizemax will be set to 4000002048, but parisize will be doubled to 2000000000 and then to 4000000000. Cheers, Bill.