[pypy-issue] [issue1529] C queue datastructure accessed via CFFI slower than Python counterpart
Amaury Forgeot d Arc
tracker at bugs.pypy.org
Wed Jul 10 17:55:59 CEST 2013
Amaury Forgeot d Arc <amauryfa at gmail.com> added the comment:
There is some unnecessary slowness when a function returns a function pointer.
In the ffi.cdef() declarations I modified deq() to return a void*,
then I added a cast in the calling code:
fp = q.deq()
fp = ffi.cast("FuncPtr", fp)
this makes the "cpp" version much faster, 3x faster than the pure python version.
assignedto: -> arigo
nosy: +amaury, arigo
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