It seems that Cython is now cythonizing multiple files in a single process, that is, the Cython process does not quit while cythonizing the entire Sage library. Combined with a small memory leak in Cython means that you currently need about 5gb of ram.
For example, in the attached plot I recorded cpu load (red) and total memory usage (rss, blue) for "sage -ba" on my quad-core i7 laptop. During the cythonize phase the memory usage grows continuously while the 8 Cython processes work through the Sage library. <https://lh3.googleusercontent.com/-zdq01RMntEA/VTcO-2l50dI/AAAAAAAAVao/wNuw62qEE6s/s1600/sage_ba_cpu_rss.png> On Monday, April 20, 2015 at 12:33:24 PM UTC-4, Andrey Novoseltsev wrote: > > Hello, > > Up to Sage-6.5 I was able to build it on my old laptop with 2GB RAM. It > has swap as well, but I don't think it was used much, the wall time was > just a bit bigger than user+system, about 8-9 hours. > > With Sage-6.6 it gets stuck while processing rings directory: swap is not > full yet, but it seems that necessary stuff does not fit RAM anymore - > heavy disk usage, low CPU temperature, not much progress after more than a > day, top was showing "python setup.py" if I recall correctly consuming > 1.5GB RAM and over 2.5GB virtual memory. This consistent over several > attempts with "make distclean", with nothing running apart from MATE > session and a terminal window. > > I realize that supporting builds on such computers may not be a high > priority, if at all, but perhaps it is a manifestation of some bug. > > Besides, while 2GB total RAM seems small nowadays, 2GB/core is quite > common, especially with VMs. (In fact, all physical and virtual machines > that I use frequently happen to have exactly this number, ranging from > 2GB/1 core to 32GB/16 cores.) > > Thank you, > Andrey > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
