New issue 2634: datetime example where pypy3 is 30x slower (and pypy2 is 3x
slower)
https://bitbucket.org/pypy/pypy/issues/2634/datetime-example-where-pypy3-is-30x-slower
Nathaniel Smith:
Test script adapted from gh16ito on IRC:
```python
# -*- encoding: utf-8 -*-
import time
from datetime import datetime, timedelta
def time_batch(batch_size, name, fn):
start = time.time()
for _ in range(batch_size):
fn()
end = time.time()
print("{:.2f} µs/{}".format((end - start) / batch_size * 1e6, name))
def test_func():
delta = timedelta(days=365+31+1, seconds=1+60+3600)
dt = datetime(1900, 1, 1)
for i in range(200):
dt += delta
def test_func_ctime():
delta = timedelta(days=365+31+1, seconds=1+60+3600)
dt = datetime(1900, 1, 1)
for i in range(200):
dt += delta
dt.ctime()
if __name__ == "__main__":
while True:
time_batch(10000, "test_func", test_func)
time_batch(10000, "test_func_ctime", test_func)
```
CPython 2.7: ~22 µs/call
CPython 3.6: ~16 µs/call
PyPy2 5.8: ~60 µs/call
PyPy3 5.8: ~480 µs/call (after a long warm up period)
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