STINNER Victor <victor.stin...@gmail.com> added the comment:
> jeethu@dev:cpython (3.7_list_insert_memmove)$ ./python -m timeit -s "l = []"
> "for _ in range(100): l.insert(0, None)"
Please don't use timeit, but perf timeit to run such *microbenchmark* (time
smaller than 1 ms).
Your benchmark measures also the performance of the loop, it might be
significant in such short loop (100 items). You may try to unroll the loop
manually, and truncate the list:
vstinner@apu$ python3 -c 'print("l.insert(None); " * 3 + "l.clear();")'
l.insert(None); l.insert(None); l.insert(None); l.clear();
Example:
python3 -m perf timeit -s 'l=[]' $(python3 -c 'print("l.insert(0, None); " *
100 + "l.clear();")') --duplicate 100
Jeethu Rao: Are you using CPU isolation? What is your OS?
----------
nosy: +vstinner
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<https://bugs.python.org/issue32534>
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