Lazily import plot.

[robertwb]

Improve startup time.

CC: @kcrisman

Component: misc

Keywords: sd32

Reviewer: Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/11043

[robertwb]

Description changed:

--- 
+++ 
@@ -1 +1,3 @@
 For startup time.
+
+Depends on #11040

[robertwb]

comment:1

Attachment: 11043-lazy-plot.patch.gz

Before

2.039 sage.all (None)
0.410 sage.misc.all (sage.all)
0.260 twisted.persisted.styles (sage.all)
0.221 sage.rings.all (sage.all)
0.188 sage.functions.all (sage.all)
0.171 functional (sage.misc.all)
0.164 piecewise (sage.functions.all)
0.162 sage.calculus.all (piecewise)
0.155 desolvers (sage.calculus.all)
0.154 sage.plot.all (desolvers)
0.151 zope.interface (twisted.persisted.styles)
0.137 pkg_resources (zope.interface)
0.132 interpreter (sage.misc.all)
0.131 IPython.ipapi (interpreter)

After

1.745 sage.all (None)
0.405 sage.misc.all (sage.all)
0.263 twisted.persisted.styles (sage.all)
0.180 sage.rings.all (sage.all)
0.168 functional (sage.misc.all)
0.154 zope.interface (twisted.persisted.styles)
0.141 pkg_resources (zope.interface)
0.134 sage.combinat.all (sage.all)
0.128 interpreter (sage.misc.all)
0.127 IPython.ipapi (interpreter)

That's another quarter-second (12.5%) savings.

[williamstein]

comment:2

Attachment: 11043-lazy-plot-rebase4.7.1.patch.gz

[robertwb]

comment:3

This is a more conservative patch which only saves importing the plot.* modules (about a 50-100ms savings on my computer).

[robertwb]

Attachment: 11043-lazy-plot-again.patch.gz

apply only this patch

[williamstein]

Description changed:

--- 
+++ 
@@ -1,3 +1,2 @@
-For startup time.
+Improve startup time.
 
-Depends on #11040