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Update whatsnew benchmark results for 3.9 #20276

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55 changes: 55 additions & 0 deletions Doc/whatsnew/3.9.rst
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Expand Up @@ -624,6 +624,61 @@ Optimizations
(Contributed by Ed Maste, Conrad Meyer, Kyle Evans, Kubilay Kocak and Victor
Stinner in :issue:`38061`.)

Here's a summary of performance improvements from Python 3.4 through Python 3.9:

.. code-block:: none

Python version 3.4 3.5 3.6 3.7 3.8 3.9
-------------- --- --- --- --- --- ---

Variable and attribute read access:
read_local 7.1 7.1 5.4 5.1 3.9 4.0
read_nonlocal 7.1 8.1 5.8 5.4 4.4 4.8
read_global 5.5 19.0 14.3 13.6 7.6 7.7
read_builtin 1.1 21.6 18.5 19.0 7.5 7.7
read_classvar_from_class 5.6 26.5 20.7 19.5 18.4 18.6
read_classvar_from_instance 2.8 23.5 18.8 17.1 16.4 20.1
read_instancevar 2.4 33.1 28.0 26.3 25.4 27.7
read_instancevar_slots 7.8 31.3 20.8 20.8 20.2 24.5
read_namedtuple 3.8 57.5 45.0 46.8 18.4 23.2
read_boundmethod 7.6 37.9 29.6 26.9 27.7 45.9

Variable and attribute write access:
write_local 8.7 9.3 5.5 5.3 4.3 4.2
write_nonlocal 0.5 11.1 5.6 5.5 4.7 4.9
write_global 9.7 21.2 18.0 18.0 15.8 17.2
write_classvar 2.9 96.0 104.6 102.1 39.2 43.2
write_instancevar 4.6 45.8 40.0 38.9 35.5 40.7
write_instancevar_slots 5.6 36.1 27.3 26.6 25.7 27.7

Data structure read access:
read_list 4.2 24.5 20.8 20.8 19.0 21.1
read_deque 4.7 25.5 20.2 20.6 19.8 21.6
read_dict 4.3 25.7 22.3 23.0 21.0 22.5
read_strdict 2.6 24.3 19.5 21.2 18.9 21.6

Data structure write access:
write_list 7.1 28.5 22.5 21.6 20.0 21.6
write_deque 8.7 30.1 22.7 21.8 23.5 23.2
write_dict 1.4 33.3 29.3 29.2 24.7 27.8
write_strdict 8.4 29.9 27.5 25.2 23.1 29.8

Stack (or queue) operations:
list_append_pop 13.4 112.7 75.4 74.2 50.8 53.9
deque_append_pop 3.5 57.0 49.4 49.2 42.5 45.5
deque_append_popleft 3.7 57.3 49.7 49.7 42.8 45.5

Timing loop:
loop_overhead 0.5 0.6 0.4 0.3 0.3 0.3

These results were generated from the variable access benchmark script at:
``Tools/scripts/var_access_benchmark.py``. The benchmark script displays timings
in nanoseconds. The benchmarks were measured on an
`Intel® Core™ i7-4960HQ processor
<https://ark.intel.com/content/www/us/en/ark/products/76088/intel-core-i7-4960hq-processor-6m-cache-up-to-3-80-ghz.html>`_
running the macOS 64-bit builds found at
`python.org <https://www.python.org/downloads/mac-osx/>`_.


Deprecated
==========
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