[yt-svn] New issue 348 in yt: Quad proj doesn't scale

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New issue 348: Quad proj doesn't scale
https://bitbucket.org/yt_analysis/yt/issue/348/quad-proj-doesnt-scale

Matthew Turk / MatthewTurk on Tue, 6 Dec 2011 23:33:02 +0100:

Description:
  The quadtree projection does not scale particularly well (although it performs quite well in serial.)  The merging algorithm requires transforming buffers into data structures, merging, and then transforming back.  We should move to a system with a single transform, stratified by level with a PH key for the value, and stepping along it in 1D in sync between two trees to add them up.

This will require no modifications to the Python code for the projection itself, but the frombuffer/tobuffer code will require modification, as will the merging code.

One potential problem is that with 64-bit integers we may run out of positions in the PH curve for some types of simulations (i.e., mine.)


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