J.E.McCormack <jamesi...@gmail.com> added the comment:
Attached is a minimal reproducer script which is sufficient to show the issue
clearly.
It is a simple single-thread Tkinter program with one canvas. No
multiprocessing, no shared variables, no connections between instances.
Instructions at top of file.
Results on i7-6700HQ, 4-core (8 thread), 2.60GHz, 16GB, Windows 10:-
1 process running alone: 29k objects/sec
6 processes running concurrently: 4.3k objects/sec each, = 25.8k
objects/sec combined.
Conclusion: One-core performance, global system-wide lock.
----------
Added file: https://bugs.python.org/file48232/mosaic.py
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<https://bugs.python.org/issue36408>
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