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# Copyright 2022 Amethyst Reese
# Licensed under the MIT license
"""
Simple perf tests for aiosqlite and the asyncio run loop.
"""
import string
import tempfile
import time
from unittest import IsolatedAsyncioTestCase as TestCase
import aiosqlite
from .smoke import setup_logger
TEST_DB = ":memory:"
TARGET = 2.0
RESULTS = {}
def timed(fn, name=None):
"""
Decorator for perf testing a block of async code.
Expects the wrapped function to return an async generator.
The generator should do setup, then yield when ready to start perf testing.
The decorator will then pump the generator repeatedly until the target
time has been reached, then close the generator and print perf results.
"""
name = name or fn.__name__
async def wrapper(*args, **kwargs):
gen = fn(*args, **kwargs)
await gen.asend(None)
count = 0
before = time.time()
while True:
count += 1
value = time.time() - before < TARGET
try:
if value:
await gen.asend(value)
else:
await gen.aclose()
break
except StopAsyncIteration:
break
except Exception as e:
print(f"exception occurred: {e}")
return
duration = time.time() - before
RESULTS[name] = (count, duration)
return wrapper
class PerfTest(TestCase):
@classmethod
def setUpClass(cls):
print(f"Running perf tests for at least {TARGET:.1f}s each...")
setup_logger()
@classmethod
def tearDownClass(cls):
print(f"\n{'Perf Test':<25} Iterations Duration {'Rate':>11}")
for name in sorted(RESULTS):
count, duration = RESULTS[name]
rate = count / duration
name = name.replace("test_", "")
print(f"{name:<25} {count:>10} {duration:>7.1f}s {rate:>9.1f}/s")
@timed
async def test_connection_memory(self):
while True:
yield
async with aiosqlite.connect(TEST_DB):
pass
@timed
async def test_connection_file(self):
with tempfile.NamedTemporaryFile(delete=False) as tf:
path = tf.name
tf.close()
async with aiosqlite.connect(path) as db:
await db.execute(
"create table perf (i integer primary key asc, k integer)"
)
await db.execute("insert into perf (k) values (2), (3)")
await db.commit()
while True:
yield
async with aiosqlite.connect(path):
pass
@timed
async def test_atomics(self):
async with aiosqlite.connect(TEST_DB) as db:
await db.execute("create table perf (i integer primary key asc, k integer)")
await db.execute("insert into perf (k) values (2), (3)")
await db.commit()
while True:
yield
async with db.execute("select last_insert_rowid()") as cursor:
await cursor.fetchone()
@timed
async def test_inserts(self):
async with aiosqlite.connect(TEST_DB) as db:
await db.execute("create table perf (i integer primary key asc, k integer)")
await db.commit()
while True:
yield
await db.execute("insert into perf (k) values (1), (2), (3)")
await db.commit()
@timed
async def test_insert_ids(self):
async with aiosqlite.connect(TEST_DB) as db:
await db.execute("create table perf (i integer primary key asc, k integer)")
await db.commit()
while True:
yield
cursor = await db.execute("insert into perf (k) values (1)")
await cursor.execute("select last_insert_rowid()")
await cursor.fetchone()
await db.commit()
@timed
async def test_insert_macro_ids(self):
async with aiosqlite.connect(TEST_DB) as db:
await db.execute("create table perf (i integer primary key asc, k integer)")
await db.commit()
while True:
yield
await db.execute_insert("insert into perf (k) values (1)")
await db.commit()
@timed
async def test_select(self):
async with aiosqlite.connect(TEST_DB) as db:
await db.execute("create table perf (i integer primary key asc, k integer)")
for i in range(100):
await db.execute("insert into perf (k) values (%d)" % (i,))
await db.commit()
while True:
yield
cursor = await db.execute("select i, k from perf")
assert len(await cursor.fetchall()) == 100
@timed
async def test_select_macro(self):
async with aiosqlite.connect(TEST_DB) as db:
await db.execute("create table perf (i integer primary key asc, k integer)")
for i in range(100):
await db.execute("insert into perf (k) values (%d)" % (i,))
await db.commit()
while True:
yield
assert len(await db.execute_fetchall("select i, k from perf")) == 100
async def test_iterable_cursor_perf(self):
async with aiosqlite.connect(TEST_DB) as db:
await db.execute(
"create table ic_perf ("
"i integer primary key asc, k integer, a integer, b integer, c char(16))"
)
for batch in range(128): # add 128k rows
r_start = batch * 1024
await db.executemany(
"insert into ic_perf (k, a, b, c) values(?, 1, 2, ?)",
[
*[
(i, string.ascii_lowercase)
for i in range(r_start, r_start + 1024)
]
],
)
await db.commit()
async def test_perf(chunk_size: int):
while True:
async with db.execute("SELECT * FROM ic_perf") as cursor:
cursor.iter_chunk_size = chunk_size
async for _ in cursor:
yield
for chunk_size in [2**i for i in range(4, 11)]:
await timed(test_perf, f"iterable_cursor @ {chunk_size}")(chunk_size)
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