On Nov 15, 2011, at 12:19 , William Stein wrote: > On Tue, Nov 15, 2011 at 12:05 PM, Georg S. Weber > <georgswe...@googlemail.com> wrote: >> >> >> On 15 Nov., 18:18, Jeroen Demeyer <jdeme...@cage.ugent.be> wrote: >>> On 2011-11-15 18:09, Maarten Derickx wrote:> I think 1024000000 byte wich >>> is about 1 gigabyte is a bit to much to >>>> allocate just at once. So the main question is where does this number >>>> come from and why is it so huge? >>> >>> The Heegner test simply needs that much memory... >>> >>> Normally you need between 2GB and 3GB of memory to run all doctests in >>> Sage successfully. >> >> Hmmm, >> >> I run regularly "make testlong" on my old G4 PowerPC Mac, and that >> system has only 768 MB RAM. Last time is just a couple of days ago > > It's not the RAM that matters for "out of memory errors", but the > amount of "memory", as Jereon says. You could probably build and > run the full test suite on a machine with 500MB RAM if you had > sufficiently fast swap. That said, swap can be slow, so some tests > my time out even though they would eventually thrash through to > completion if you let them run long enough. > > (I actually just built Sage-4.7.2. from scratch on a free Amazon EC2 > instance with 600MB RAM. It was crucial to create a swap file, since > otherwise linbox fails to build.) > > I don't understand how swap space works on Macs. It seems that the > operating system dynamically allocates it. You probably have some on > your old 768MB RAM mac.
That's correct: the dynamic pager manages paging space. See "man dynamic_pager" for a little bit of info. Justin -- Justin C. Walker, Curmudgeon at Large Director Institute for the Enhancement of the Director's income ----------- Question 43: What if the hokey pokey really *is* what it’s all about? -- -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
