toy example for GIL contention test.
test_abc() measures calls/sec
a) single threaded:
for _ in range(10000000):
test_abc()
b) Case b): multi threaded, two threads, each doing a), but
test_abc() drops the GIL
python setup.py develop
python -u main.py | tee data.dat
Results on MacBook (in 1000 calls/sec):
method single thread two threads
pybind w/ GIL held 5769.2 5542.3
pybind w/ GIL dropped 4360.5 1614.7
C API w/ GIL held 77954.0 76413.6
C API w/ GIL dropped 15467.2 5259.7
C++ loop 3584229.4 7043703.5
(C++ results not shown as they require a log plot.)