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15db566420
Many python tests were setting the GC/compaction period to large values, to effectively disable GC / compaction. Reserve value 0 to mean "explicitly disabled". We also set them to 0 in unit tests now, although currently, unit tests don't launch the background jobs at all, so it won't have any effect. Fixes https://github.com/neondatabase/neon/issues/2917
40 lines
1.3 KiB
Python
40 lines
1.3 KiB
Python
import time
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from fixtures.neon_fixtures import NeonEnvBuilder
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#
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# Benchmark searching the layer map, when there are a lot of small layer files.
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#
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def test_layer_map(neon_env_builder: NeonEnvBuilder, zenbenchmark):
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env = neon_env_builder.init_start()
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n_iters = 10
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n_records = 100000
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# We want to have a lot of lot of layer files to exercise the layer map. Disable
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# GC, and make checkpoint_distance very small, so that we get a lot of small layer
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# files.
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tenant, _ = env.neon_cli.create_tenant(
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conf={
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"gc_period": "0s",
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"checkpoint_distance": "8192",
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"compaction_period": "1 s",
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"compaction_threshold": "1",
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"compaction_target_size": "8192",
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}
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)
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env.neon_cli.create_timeline("test_layer_map", tenant_id=tenant)
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pg = env.postgres.create_start("test_layer_map", tenant_id=tenant)
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cur = pg.connect().cursor()
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cur.execute("create table t(x integer)")
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for i in range(n_iters):
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cur.execute(f"insert into t values (generate_series(1,{n_records}))")
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time.sleep(1)
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cur.execute("vacuum t")
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with zenbenchmark.record_duration("test_query"):
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cur.execute("SELECT count(*) from t")
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assert cur.fetchone() == (n_iters * n_records,)
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