[IPython-dev] slow startup due to script magic

MinRK benjaminrk at gmail.com
Sun Sep 23 16:52:59 EDT 2012

On Sat, Sep 22, 2012 at 6:19 PM, Jason Grout <jason-sage at creativetrax.com>wrote:

> On 9/22/12 1:33 PM, Fernando Perez wrote:
> > On Sat, Sep 22, 2012 at 3:40 AM, Thomas Kluyver <takowl at gmail.com>
> wrote:
> >> Hmm, well spotted. If it's that slow, I think we should avoid doing it
> >> during IPython start up at all. I like it to start up quickly.
> >
> > Absolutely, thanks for catching this, Jason!  Indeed, startup time is
> > a really important consideration, and we should be very careful with
> > it.
> >
> > Does anyone have a tool to instrument the startup process in an easy
> > manner?  Jason, if you guys have any such tools for Sage that you
> > could share, we could track these things and prevent similar
> > regressions in the future.
> We do have a sage -startuptime script that (I think) uses an import hook
> to track the time to import the many modules that Sage imports.  It
> sounds like that may not be as useful to you guys, since you don't
> import nearly as many things as we do.  And that's mainly for us to
> diagnose startup time regressions by hand.
> I suppose it would be pretty straightforward to add a nose test that
> would check the time to start a full kernel, right?
> >
> >> Maybe we should keep it simple: rather than checking for the existence
> >> of each interpreter, just set a standard list. It would mean that
> >> users can tab complete e.g. %%pypy, even if they don't have pypy
> >> installed, but I don't think it will be too surprising if they try it
> >> and it fails.
> >
> > We could also cache the search path and do it only on first usage,
> > rather than at IPython startup.  Else we can discuss moving this to an
> > optional extension...
> It's also less confusing to have a standard list that is always
> available.  Otherwise I have to try to guess why in the world I have
> %%ruby, but you don't.
> I'd say that %%ruby should invoke ruby with "/bin/env ruby" and leave it
> at that.  Why do we need to cache the path?


> Thanks,
> Jason
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