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762a8a7bb5
Ruff has "B" class of lints, including B018 which will nag on useless expressions, related to #4719. Enable such lints and fix the existing issues. Most notably: - https://beta.ruff.rs/docs/rules/mutable-argument-default/ - https://beta.ruff.rs/docs/rules/assert-false/ --------- Co-authored-by: Alexander Bayandin <alexander@neon.tech>
39 lines
1.5 KiB
Python
39 lines
1.5 KiB
Python
from contextlib import closing
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import pytest
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from fixtures.compare_fixtures import PgCompare
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from pytest_lazyfixture import lazy_fixture
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@pytest.mark.parametrize(
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"env",
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[
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# The test is too slow to run in CI, but fast enough to run with remote tests
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pytest.param(lazy_fixture("neon_compare"), id="neon", marks=pytest.mark.slow),
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pytest.param(lazy_fixture("vanilla_compare"), id="vanilla", marks=pytest.mark.slow),
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pytest.param(lazy_fixture("remote_compare"), id="remote", marks=pytest.mark.remote_cluster),
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],
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)
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def test_hot_table(env: PgCompare):
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# Update a small table many times, then measure read performance
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num_rows = 100000 # Slightly larger than shared buffers size TODO validate
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num_writes = 1000000
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num_reads = 10
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with closing(env.pg.connect()) as conn:
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with conn.cursor() as cur:
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cur.execute("drop table if exists t;")
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# Write many updates to a small table
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with env.record_duration("write"):
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cur.execute("create table t (i integer primary key);")
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cur.execute(f"insert into t values (generate_series(1,{num_rows}));")
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for i in range(num_writes):
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cur.execute(f"update t set i = {i + num_rows} WHERE i = {i};")
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# Read the table
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with env.record_duration("read"):
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for _ in range(num_reads):
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cur.execute("select * from t;")
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cur.fetchall()
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