Add test_long_kernel
#826
Merged
Add test_long_kernel
#826
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On Python 3.12, this provokes a stack overflow in the scheduler. It is
not quite clear why that's the case; pure-Python recursion even with
generators seems to respond well to setrecursionlimit():
```py
def f(n):
if n:
yield from f(n-1)
else:
yield 5
import sys
sys.setrecursionlimit(3500)
print(list(f(3400)))
```
That said, there have been [behavior](python/cpython#96510)
[changes](python/cpython#112215)
in Py3.12 in this regard, but it is not clear what exactly
about Loopy's behavior makes it fall into the 'bad' case.
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On Python 3.12, this provokes a stack overflow in the scheduler. It is not quite clear why that's the case; pure-Python recursion even with generators seems to respond well to setrecursionlimit():
That said, there have been behavior changes in Py3.12 in this regard, but it is not clear what exactly about Loopy's behavior makes it fall into the 'bad' case.
This is a smaller reproducer of an issue flagged by @a-alveyblanc in the context of tensor product code generated from Pytato.
It appears that Py3.12 will receive some changes soon that mitigate this. More broadly, a better scheduling algorithm would help with this, as would #350.