On Apr 1, 11:23 am, Robert Bradshaw <[EMAIL PROTECTED]> wrote: > On Apr 1, 2008, at 10:45 AM, Nick Alexander wrote: > > > On 1-Apr-08, at 10:36 AM, Gary Furnish wrote: > > >> Right now pulling in group theory may end up pulling in calculus. > >> There are similar issues all over with really tight coupling > >> between subsystems. It ought to be possible to use group theory > >> (maybe without a feature or two) without calculus and vice versa. > > > This isn't really a global namespace pollution issue, but it is a > > concern. One way to deal with this is to make (more) imports > > function or class local. I'm not sure if there are performance > > penalties for this, especially in Cython. Can anyone say? > > Importing locally takes time, even if just to discover the cached > import if it has already been done once. This is independent of > whether or not the file is in Cython (though the relative overhead > may be much greater for a Cythonized function).
For instance, see https://bugs.launchpad.net/cython/+bug/155076, where I measure the cost of a local import as around 2 microseconds. > The order in which things are imported is really, really crazy right > now, as anyone trying to hunt down an (easy to trigger) circular > references can attest to. It would be great if this could be cleaned > up, both for developing Sage and for making things more modular so > other projects can benefit from them. Yes, this would be great! It seems like it would be very difficult to fix, though. Carl --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
