A. Skrobov added the comment:
The attached patch for the parser reduces "Maximum resident set size (kbytes)"
threefold, for the degenerate example of 'import ast; ast.parse("0,"*1000000,
mode="eval")', by eliminating many CST nodes that have a single child.
According to the comment in node.c -- "89% of PyObject_REALLOC calls in
PyNode_AddChild passed 1 for the size" -- the memory saving should be generally
applicable, and not limited just to this degenerate case.
Modules/parsermodule.c is not yet updated to match. Please tell if you want me
to do that, in case that my proposed change to the parser is acceptable.
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Added file: http://bugs.python.org/file42101/patch
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