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from __future__ import annotations
import asyncio
import time
import pytest
from distributed.diagnostics import MemorySampler
from distributed.utils_test import gen_cluster
@gen_cluster(client=True)
async def test_async(c, s, a, b):
ms = MemorySampler()
async with ms.sample("foo", measure="managed", interval=0.1):
f = c.submit(lambda: 1)
await f
await asyncio.sleep(0.5)
assert ms.samples["foo"][0][1] == 0
assert ms.samples["foo"][-1][1] > 0
# Test that there is no server-side memory leak
assert not s.extensions["memory_sampler"].samples
def test_sync(client):
ms = MemorySampler()
with ms.sample("foo", measure="managed", interval=0.1):
f = client.submit(lambda: 1)
f.result()
time.sleep(0.5)
assert ms.samples["foo"][0][1] == 0
assert ms.samples["foo"][-1][1] > 0
@gen_cluster(client=True) # MemorySampler internally fetches the client
async def test_at_least_one_sample(c, s, a, b):
"""The first sample is taken immediately
Also test omitting the label
"""
ms = MemorySampler()
async with ms.sample():
pass
assert len(next(iter(ms.samples.values()))) == 1
@pytest.mark.slow
@gen_cluster(client=True)
async def test_multi_sample(c, s, a, b):
ms = MemorySampler()
s1 = ms.sample("managed", measure="managed", interval=0.15)
s2 = ms.sample("process", interval=0.2)
async with s1, s2:
idle_mem = s.memory.process
f = c.submit(lambda: "x" * 100 * 2**20) # 100 MiB
await f
while s.memory.process < idle_mem + 80 * 2**20:
# Wait for heartbeat
await asyncio.sleep(0.01)
await asyncio.sleep(0.6)
m = ms.samples["managed"]
p = ms.samples["process"]
assert len(m) >= 2
assert m[0][1] == 0
assert m[-1][1] >= 100 * 2**20
assert len(p) >= 2
assert p[0][1] > 2**20 # Assume > 1 MiB for idle process
assert p[-1][1] > p[0][1] + 80 * 2**20
assert m[-1][1] < p[-1][1]
@gen_cluster(client=True)
@pytest.mark.parametrize("align", [False, True])
async def test_pandas(c, s, a, b, align):
pd = pytest.importorskip("pandas")
pytest.importorskip("matplotlib")
ms = MemorySampler()
async with ms.sample("foo", measure="managed", interval=0.15):
f = c.submit(lambda: 1)
await f
await asyncio.sleep(0.7)
assert ms.samples["foo"][0][1] == 0
assert ms.samples["foo"][-1][1] > 0
df = ms.to_pandas(align=align)
assert isinstance(df, pd.DataFrame)
if align:
assert isinstance(df.index, pd.TimedeltaIndex)
assert df["foo"].iloc[0] == 0
assert df["foo"].iloc[-1] > 0
assert df.index[0] == pd.Timedelta(0, unit="s")
assert pd.Timedelta(0, unit="s") < df.index[1]
assert df.index[1] < pd.Timedelta(1.5, unit="s")
else:
assert isinstance(df.index, pd.DatetimeIndex)
assert pd.Timedelta(0, unit="s") < df.index[1] - df.index[0]
assert df.index[1] - df.index[0] < pd.Timedelta(1.5, unit="s")
plt = ms.plot(align=align, grid=True)
assert plt
@pytest.mark.slow
@gen_cluster(client=True)
@pytest.mark.parametrize("align", [False, True])
async def test_pandas_multiseries(c, s, a, b, align):
"""Test that multiple series are upsampled and aligned to each other"""
pd = pytest.importorskip("pandas")
ms = MemorySampler()
for (label, interval, final_sleep) in (("foo", 0.15, 1.0), ("bar", 0.2, 0.6)):
async with ms.sample(label, measure="managed", interval=interval):
x = c.submit(lambda: 1, key="x")
await x
await asyncio.sleep(final_sleep)
del x
while "x" in s.tasks:
await asyncio.sleep(0.01)
for label in ("foo", "bar"):
assert ms.samples[label][0][1] == 0
assert ms.samples[label][-1][1] > 0
df = ms.to_pandas(align=align)
if align:
assert df.index[0] == pd.Timedelta(0, unit="s")
# ffill does not go beyond the end of the series
assert df["foo"].iloc[0] == 0
assert df["foo"].iloc[-1] > 0
assert df["bar"].iloc[0] == 0
assert pd.isna(df["bar"].iloc[-1])
assert df["bar"].ffill().iloc[-1] > 0
else:
assert df["foo"].iloc[0] == 0
assert pd.isna(df["foo"].iloc[-1])
assert pd.isna(df["bar"].iloc[0])
assert df["bar"].iloc[-1] > 0
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