On Tue, Jan 22, 2019 at 10:32 PM Jeroen Demeyer <j.deme...@ugent.be> wrote: > > On 2019-01-23 00:11, William Stein wrote: > > I helped support somebody using the Cygwin > > version of Sage on Windows at the Sage booth at the Joint Math > > Meetings last week, and it typically took about 1 minute to start up > > Sage, which was scary. > > But mathematical computations (which do not involve syscalls) shouldn't > be slower, right?
When doing support for this user, actually running code seemed fine after the 1 minute (?) startup time. Unfortunately, she was mainly asking about how to use init.sage. (Incidentally, there was numerous questions from Sage users, where the answer is: ~/.sage/init.sage. Evidently it is difficult to learn about ~/.sage/init.sage for some reason. Maybe it should be documented more.) I haven't done benchmarks of cygwin+sage in a decade. My totally outdated experience, which I am probably misremembering, was that mathematical computations that do not involve syscalls could easily be much slower on Cygwin that under VirtualBox + Linux on exactly the same hardware (even though both code was compiled using GCC). This is no surprise to me, since memory management is different between the two, and when I last benchmarked Cygwin was 32-bit only, whereas VirtualBox + Linux was 64-bit, which could significantly impact performance. How memory is cached and managed can impact performance of CPU bound code a lot, and the algorithms differ between Linux, Windows, and OS X. I also remember being similarly frustrated that native Sage on OS X was often slower for things I cared about than VirtualBox + Linux + Sage on OS X; but maybe security (which involves memory address randomization) is higher priority than speed for OS X, for good reason. -- William -- 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 https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
