[IPython-User] IPython 0.11.x "sluggishness" in pylab mode

sunqiang sunqiang@gmail....
Tue Oct 19 19:00:25 CDT 2010

Maybe the "hang" happens in IPython 0.10.x (or ever before) too.
just import matplotlib.pyplot as plt, plt.plot([1, 2, 3, 4]), plt.show().
the "hang" will make input anything uncomfortable until restart ipython.

On Wed, Oct 20, 2010 at 7:18 AM, Wes McKinney <wesmckinn@gmail.com> wrote:
> Something I've noticed using the git HEAD IPython in pylab mode-- if I
> leave it for a minute or two and use another application (say, emacs
> or Chrome), then come back to the terminal and start typing something,
> it will consistently "hang" momentarily (maybe 200ms to a second or
> more) before the console input appears on screen. This didn't happen
> in IPython 0.10.x so I was curious what could be causing it. This is
> on 64-bit Ubuntu 10.04 with EPD 6.2.2.
> Anyone else notice this? It only seems to happen in Pylab mode so I
> assume it's some kind of concurrency / threading issue.
> The way I'm reproducing this:
> start IPython in pylab mode (WXAgg backend default)
> wait 60 seconds
> start typing something, problem present
> %gui (to disable gui backends)
> wait 60 seconds
> start typing something, no lag / hanging
> %gui wx
> wait 60 seconds
> start typing something, problem present
> Thanks,
> Wes
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