[yt-users] annotate_contour takes much longer time to run than expected on some machines

[Nathan Goldbaum]

Hey Bili,

Just a shot in the dark, but do you have different matplotlib versions
installed on your machine and server at UCSD? The contour callback is using
some internal machinery in matplotlib that changed relatively recently.

It might also be worthwhile to run your script under cProfile so we get an
idea of which function exactly is taking so long. Even better if you can
run *that* function under the line_profiler.

-Nathan

On Mon, Aug 10, 2015 at 5:10 PM, Bili Dong <qobilidop at gmail.com> wrote:

> Hi yt-users,
>
> I’m using yt-3.2 (Changeset = 329b5039b031 stable).
>
> The problem is that the same script that could finish in seconds on my
> local machine will take much  (order of magnitude) longer time to run on
> the server I’m using. In some cases, it get stuck for hours that I don’t
> know if it will ever finish. I’ve tracked down the bottleneck to be the
> `annotate_contour` method. The server should be faster than my local
> machine. (I’m not exactly sure about how to compare it. But the server is
> generally much faster in other situations.)
>
> For example, for this script (http://paste.yt-project.org/show/5808/), on
> my local machine the output shows:
>
> ```
> yt : [INFO     ] 2015-08-10 *14:48:15*,401 Making a fixed resolution
> buffer of (('gas', 'density')) 800 by 800
> yt : [INFO     ] 2015-08-10 *14:48:15*,751 Saving plot
> snapshot_200_Projection_z_density.png
> yt : [INFO     ] 2015-08-10 *14:48:16*,716 Saving plot
> snapshot_200_Projection_z_density.png
> ```
>
> However, on the server the output shows:
> ```
> yt : [INFO     ] 2015-08-10 *14:51:25*,551 Making a fixed resolution
> buffer of (('gas', 'density')) 800 by 800
> yt : [INFO     ] 2015-08-10 *14:51:25*,917 Saving plot
> snapshot_200_Projection_z_density.png
> yt : [INFO     ] 2015-08-10 *14:56:21*,922 Saving plot
> snapshot_200_Projection_z_density.png
> ```
>
> That’s *296* times slower!!!
>
> This is likely to be a very specific problem with the server. But I’d like
> to know if anyone else has encountered similar problems before so I can
> learn from your experience. For now, I have no idea what could have gone
> wrong.
>
> BTW, I’m using TSCC (http://idi.ucsd.edu/computing/) at UC San Diego, if
> you happen to know it.
>
> Thanks,
> Bili
>
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>
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