I just ran into this problem on a machine with 512 GB of ram, where the Sage virtual memory usage is around 128 GB. Volker might consider that a tiny fraction of the possible address space, but it still seems a bit ridiculous. I noticed this when I tried to use @parallel to 64 processes. (overcommit_memory is set to 2 on this machine.) I could @parallel(2) but not @parallel(3).
I can change the overcommit settings, but not everyone is so lucky. I haven't actually tried (I'm just using an old version of sage for now) and I don't actually know what the default overcommit policy would do with this. 8 TB is not such a small fraction of the possible address space anymore. Also, there could be situations where I want to fork significantly more processes than the number of cpus. Also, 2 TB of ram is not so unreasonable these days (is PARI going allocate 500 GB?) and neither is > 64 cores, so this seems like it could be problematic for some users, and, in any case, it is annoying. On Wed, Aug 31, 2016 at 8:23 AM, Jeroen Demeyer <jdeme...@cage.ugent.be> wrote: > On 2016-08-31 08:57, Thierry Dumont wrote: > >> On machine 2, sage stating process (as mesured with top) uses about 39GB >> (no more...) out of 153.79 available. >> > > It doesn't actually "use" that memory. It is reserved virtual memory but > it does not take up physical memory or swap space. > > > -- > You received this message because you are subscribed to the Google Groups > "sage-support" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sage-support+unsubscr...@googlegroups.com. > To post to this group, send email to sage-support@googlegroups.com. > Visit this group at https://groups.google.com/group/sage-support. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
