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import inspect
from concurrent.futures import Future
from typing import Any, Callable, Dict
import pytest
import parsl
from parsl.executors.base import ParslExecutor
# N is the number of tasks to chain
# With mid-2024 Parsl, N>140 causes Parsl to hang
N = 100
# MAX_STACK is the maximum Python stack depth allowed for either
# task submission to an executor or execution of a task.
# With mid-2024 Parsl, 2-3 stack entries will be used per
# recursively launched parsl task. So this should be smaller than
# 2*N, but big enough to allow regular pytest+parsl stuff to
# happen.
MAX_STACK = 50
def local_config():
return parsl.Config(executors=[ImmediateExecutor()])
class ImmediateExecutor(ParslExecutor):
def start(self):
pass
def shutdown(self):
pass
def submit(self, func: Callable, resource_specification: Dict[str, Any], *args: Any, **kwargs: Any) -> Future:
stack_depth = len(inspect.stack())
assert stack_depth < MAX_STACK, "tasks should not be launched deep in the Python stack"
fut: Future[None] = Future()
res = func(*args, **kwargs)
fut.set_result(res)
return fut
@parsl.python_app
def chain(upstream):
stack_depth = len(inspect.stack())
assert stack_depth < MAX_STACK, "chained dependencies should not be launched deep in the Python stack"
@pytest.mark.local
def test_deep_dependency_stack_depth():
fut = Future()
here = fut
for _ in range(N):
here = chain(here)
fut.set_result(None)
here.result()
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