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from __future__ import annotations
import asyncio
import pytest
from distributed.metrics import time
from distributed.shuffle._limiter import ResourceLimiter
from distributed.utils_test import gen_test
@gen_test()
async def test_limiter_basic():
res = ResourceLimiter(5)
assert isinstance(repr(res), str)
res.increase(2)
assert res.available() == 3
res.increase(3)
assert not res.available()
# This is too much
res.increase(1)
assert not res.available()
with pytest.raises(asyncio.TimeoutError):
await asyncio.wait_for(res.wait_for_available(), 0.1)
await res.decrease(1)
assert not res.available()
with pytest.raises(asyncio.TimeoutError):
await asyncio.wait_for(res.wait_for_available(), 0.1)
await res.decrease(1)
assert res.available() == 1
await res.wait_for_available()
res.increase(1)
assert not res.available()
with pytest.raises(asyncio.TimeoutError):
await asyncio.wait_for(res.wait_for_available(), 0.1)
await res.decrease(5)
assert res.available() == 5
with pytest.raises(RuntimeError, match="more"):
await res.decrease(1)
res.increase(10)
with pytest.raises(asyncio.TimeoutError):
await asyncio.wait_for(res.wait_for_available(), 0.1)
await res.decrease(3)
assert not res.available()
await res.decrease(5)
assert res.available() == 3
@gen_test()
async def test_limiter_concurrent_decrease_releases_waiter():
res = ResourceLimiter(5)
res.increase(5)
wait_for_available = asyncio.create_task(res.wait_for_available())
event = asyncio.Event()
async def decrease():
await event.wait()
await res.decrease(5)
decrease_buffer = asyncio.create_task(decrease())
with pytest.raises(asyncio.TimeoutError):
await asyncio.wait_for(asyncio.shield(wait_for_available), 0.1)
event.set()
await wait_for_available
@gen_test()
async def test_limiter_statistics():
res = ResourceLimiter(1)
assert res.time_blocked_avg == 0.0
assert res.time_blocked_total == 0.0
await res.wait_for_available()
assert res.time_blocked_avg == 0.0
assert res.time_blocked_total == 0.0
res.increase(1)
start = time()
blocked_wait = asyncio.create_task(res.wait_for_available())
await asyncio.sleep(0.05)
assert not blocked_wait.done()
await res.decrease(1)
await blocked_wait
stop = time()
assert stop - start >= res.time_blocked_total > 0.0
assert res.time_blocked_total > res.time_blocked_avg
before_total = res.time_blocked_total
before_avg = res.time_blocked_avg
await res.wait_for_available()
assert before_total == res.time_blocked_total
assert before_avg > res.time_blocked_avg
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