Hi all,<div><br></div><div>I just wanted to highlight something here because it has come up a few times off-list and in the IRC channel. Your next "yt update" may fail if you haven't upgraded to Cython 0.16. There are two ways to update Cython:</div>
<div><div><br></div><div>1) The installation script has been updated to include Cython 0.16, so if you re-run that then you should be set. </div><div>2) Install Cython 0.16 manually with "pip install -U Cython"</div>
<div><br></div><div>Sam</div></div><br><div class="gmail_quote">On Fri, Jun 15, 2012 at 4:58 PM, Matthew Turk <span dir="ltr"><<a href="mailto:matthewturk@gmail.com" target="_blank">matthewturk@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi all,<br>
<br>
This landed today in the development tip of yt.<br>
<br>
If you update and run into any weird problems, please stop by IRC or<br>
email the list and we can work through them with you.<br>
<br>
-Matt<br>
<div class="HOEnZb"><div class="h5"><br>
On Wed, Jun 13, 2012 at 11:23 AM, Matthew Turk <<a href="mailto:matthewturk@gmail.com">matthewturk@gmail.com</a>> wrote:<br>
> Hi all,<br>
><br>
> SInce last December, Sam and I have been working on and off on<br>
> threading the volume rendering system and providing a major step<br>
> forward in its speed and quality.<br>
><br>
> We've issued a pull request to finish off these efforts and move them<br>
> into the main yt core. This includes a threaded volume renderer,<br>
> transfer functions with a degree of opacity, and the ability to (in<br>
> the future) much more explicitly control the behavior of the volume<br>
> renderer on the cell-level. All of the code is now separated into<br>
> very small component pieces, and it is more maintainable. The<br>
> threading works in conjunction with both MPI parallelism and MPI<br>
> parallelism for tiling, which means in theory the yt volume renderer<br>
> now operates at three levels of parallelism. (Which is kind of neat,<br>
> I think.)<br>
><br>
> However, once this is accepted, the minimum requirements to build the<br>
> development branch of yt will be upgraded to include Cython 0.16.<br>
> This is because Cython 0.16 includes OpenMP support. The installation<br>
> script has been updated to include Cython 0.16, so if you re-run that<br>
> (or install Cython 0.16 manually with "pip install -U Cython") then<br>
> you should be set. Otherwise you may run into problems during your<br>
> next "yt update". Additionally, _amr_utils has been renamed to lib,<br>
> which I don't think will cause issues but there is an outside chance<br>
> it will.<br>
><br>
> Finally, the off-axis-projections have changed in behavior. They no<br>
> longer interpolate within a cell. The end result is that the<br>
> projections are truer to the data, but this comes at the expense of a<br>
> bit of smoothness. They are now also ~20x faster.<br>
><br>
> This will be a core component of the yt 2.4 release, scheduled for a<br>
> few weeks from now. We encourage you to test this branch and new<br>
> behavior. Also, please reply if you have any questions or comments<br>
> about any of this!<br>
><br>
> Reference info:<br>
><br>
> <a href="http://lists.spacepope.org/pipermail/yt-dev-spacepope.org/2012-June/002039.html" target="_blank">http://lists.spacepope.org/pipermail/yt-dev-spacepope.org/2012-June/002039.html</a><br>
> <a href="https://bitbucket.org/yt_analysis/yt/pull-request/168/volume-rendering-refactor" target="_blank">https://bitbucket.org/yt_analysis/yt/pull-request/168/volume-rendering-refactor</a><br>
><br>
> example "samplers":<br>
><br>
> <a href="https://bitbucket.org/MatthewTurk/yt-refactor/src/ec374f56d5b6/yt/utilities/lib/grid_traversal.pyx#cl-310" target="_blank">https://bitbucket.org/MatthewTurk/yt-refactor/src/ec374f56d5b6/yt/utilities/lib/grid_traversal.pyx#cl-310</a><br>
> <a href="https://bitbucket.org/MatthewTurk/yt-refactor/src/ec374f56d5b6/yt/utilities/lib/grid_traversal.pyx#cl-344" target="_blank">https://bitbucket.org/MatthewTurk/yt-refactor/src/ec374f56d5b6/yt/utilities/lib/grid_traversal.pyx#cl-344</a><br>
><br>
> -Matt<br>
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</div></div></blockquote></div><br>