26 lines
830 B
Markdown
26 lines
830 B
Markdown
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# Timings of CPython Operations
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Here are some *very rough* approximate timings of CPython interpreter
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operations:
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* `f(1)` (empty function body): 70-90ns
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* `f(n=1)` (empty function body): 90-110ns
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* `o.x`: 30-40ns
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* `o.f(1)` (empty method body): 80-160ns
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* `Cls(1)` (initialize attribute in `__init__`): 290-330ns
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* `x + y` (integers): 20-35ns
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* `a[i]` (list) : 20-40ns
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* `[i]` (also dealloc): 35-55ns
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* `a.append(i)` (list, average over 5 appends): 70ns
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* `d[s]` (dict, shared str key): 20ns
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* `d[s] = i` (dict, shared str key): 40ns
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* `isinstance(x, A)`: 100ns
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* `(x, y)`: 20-35ns
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* `x, y = t` (tuple expand): 10ns
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Note that these results are very imprecise due to many factors, but
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these should give a rough idea of the relative costs of various
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operations.
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Details: CPython 3.6.2, Macbook Pro 15" (Mid 2015), macOS Sierra
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