Michael Droettboom wrote:
John Hunter wrote:
log_demo.py 1.769 2.011 0.242 113%
Here is another area where there is an important difference. Panning
and zooming interactively with log scaling is much slower on the
branch, presumably because you have to redo the non-affine part every
time.
The non-affine part is not computed on every pan and zoom -- that was
one of the main design goals of the branch. (You can put a print
statement in Log10Transform.transform to see when it gets called.) I
can't feel a speed difference between the two, but...
Also, the old grid line bug on log plots seems to be back, as
evinced when you zoom from the "home" view.
...I should fix this bug first to have a fair comparison.
Fixing that bug actually had a net positive effect on the benchmarks
overall... (More correct *and* faster? Never happens.)
I created a benchmark using the middle plot of log_demo.py and moving
the bounds (just like simple_plot_fps.py) and I get the following:
Trunk: 23.68 fps
Branch: 16.83 fps
So there's definitely a slow down there. The profiler shows that a huge
chunk of the time is spent in numpy/core/ma.py, suggesting that masked
arrays are the culprit. I think further quarantining of masked arrays
will help -- for instance, a masked array is created whether or not
there are any values <= 0.0.
Any thoughts on this are welcome.
Cheers,
Mike
--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA
#!/usr/bin/env python
"""
Example: simple line plot.
Show how to make and save a simple line plot with labels, title and grid
"""
from pylab import *
ion()
t = arange(0.001, 20.0+0.001, 0.001)
plot(t, sin(2*pi*t))
xlabel('time (s)')
ylabel('voltage (mV)')
title('About as simple as it gets, folks')
grid(True)
axes().set_xscale('log')
import time
frames = 100.0
t = time.time()
c = time.clock()
for i in xrange(int(frames)):
part = i / frames
axis([part * 20.0 + 0.001, part * 20.0 + 20.001, -1.0, 1.0])
wallclock = time.time() - t
user = time.clock() - c
print "wallclock:", wallclock
print "user:", user
print "fps:", frames / wallclock
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