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

[Bili Dong]

Hi Nathan,

I checked that the matplotlib versions are the same.

I changed my script to http://paste.yt-project.org/show/5809/. The results of cProfile on the server are http://paste.yt-project.org/show/5810/. Judging by eye, it seems to be related to the triangulation functionality.

-Bili

> On Aug 10, 2015, at 3:15 PM, Nathan Goldbaum <nathan12343 at gmail.com> wrote:
> 
> 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 <mailto: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/ <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/ <http://idi.ucsd.edu/computing/>) at UC San Diego, if you happen to know it.
> 
> Thanks,
> Bili
> 
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