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Sergey Sharybin 5494683651 Cycles: Free Blender side data as soon as we don't need it ...

Currently this is possible after built-in images are loaded in memory.
Allows to save memory used by dependency graph and copy-on-write.

In practice this lowers peak system memory usage from 52GB to 42GB on
a production file of spring 03_035_A.lighting.

Note, that this only applies to F12 and command line renders.

Bigger note, that this optimization is currently only possible if
there are no grease pencil objects to be rendered.

2018-11-09 17:53:02 +01:00

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