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https://github.com/neondatabase/neon.git
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00c26ff3a3
* test/fixtures: fix DeprecationWarning * workflows/benchmarking: increase timeout * test: switch pgbench to default(simple) query mode * test/performance: ensure we don't have tables that we're creating * workflows/pg_clients: remove unused env var * workflows/benchmarking: change platform name
38 lines
1.5 KiB
Python
38 lines
1.5 KiB
Python
import pytest
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from contextlib import closing
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from fixtures.compare_fixtures import PgCompare
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from pytest_lazyfixture import lazy_fixture # type: ignore
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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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def test_hot_page(env: PgCompare):
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# Update the same page many times, then measure read performance
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num_writes = 1000000
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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, f;')
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# Write many updates to the same row
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with env.record_duration('write'):
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cur.execute('create table t (i integer);')
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cur.execute('insert into t values (0);')
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for i in range(num_writes):
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cur.execute(f'update t set i = {i};')
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# Write 3-4 MB to evict t from compute cache
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cur.execute('create table f (i integer);')
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cur.execute(f'insert into f values (generate_series(1,100000));')
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# Read
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with env.record_duration('read'):
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cur.execute('select * from t;')
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cur.fetchall()
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