Marc Mezzarobba wrote:
> Some profiling data (via linux-perf) for
>
> sage: def f():
> ....: for i in [x]range(100000000):
> ....: a+a
where a = Integer(1).
If a is made local to the function, the very expensive lookups
disappear, and we still see calls to PyLong_FromLong taking much longer
than PyInt_FromLong, as Vincent suspected. However, I don't understand
why PyLong_FromLong needs to be called at all here.
- 79,71% 0,00% python2 libpython2.7.so.1.0 [.] builtin_eval
builtin_eval
PyEval_EvalCode
PyEval_EvalCodeEx
PyEval_EvalFrameEx
call_function (inlined)
fast_function (inlined)
- PyEval_EvalFrameEx
+ 19,47% PyNumber_Add
+ 4,23% __pyx_f_4sage_5rings_7integer_fast_tp_dealloc
- 2,19% PyInt_FromLong
PyInt_FromLong
1,65% rangeiter_next
1,12% PyInt_FromLong@plt
0,67% 0x7fde644a906
- 77,70% 0,00% python3 libpython3.7m.so.1.0
[.] builtin_eval
builtin_eval
builtin_eval_impl (inlined)
PyEval_EvalCode
PyEval_EvalCodeEx
_PyEval_EvalCodeWithName
_PyEval_EvalFrameDefault
call_function (inlined)
function_code_fastcall
- _PyEval_EvalFrameDefault
+ 15,77% PyNumber_Add
- 13,30% PyLong_FromLong
+ 10,01% _PyLong_New
0,63% _PyLong_New@plt
+ 8,37% _PyObject_Free
+ 2,70% __pyx_f_4sage_5rings_7integer_fast_tp_dealloc
1,20% rangeiter_next
0,83% PyLong_FromLong@plt
0,83% PyNumber_Add@plt
--
Marc
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