New issue 2351: Creating and overwriting tuples 4x slower on PyPy https://bitbucket.org/pypy/pypy/issues/2351/creating-and-overwriting-tuples-4x-slower
Eric Astor: Using PyPy 5.3.1 (on Windows): ``` #!bash pypy -m timeit -n 10000 -s "a = range(10000)" "tuple(a)" ``` takes (on my system) ~67 usec per loop, while ``` #!bash python27 -m timeit -n 10000 -s "a = range(10000)" "tuple(a)" ``` takes only ~25.5 usec per loop. Furthermore, assigning the tuple to a variable ``` #!bash pypy -m timeit -n 10000 -s "a = range(10000)" "x = tuple(a)" ``` now takes ~109 usec per loop, but does not impact CPython's performance at all. However, if we clear the variable after each assignment, performance recovers: ``` #!bash pypy -m timeit -n 10000 -s "a = range(10000)" "x = tuple(a); del x" ``` returns to taking ~67 usec per loop. _______________________________________________ pypy-issue mailing list pypy-issue@python.org https://mail.python.org/mailman/listinfo/pypy-issue
