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Add test_lfc_async_prefetch_performance

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This commit is contained in:
Konstantin Knizhnik
2025-04-22 19:11:21 +03:00
parent 0f2985eb2c
commit 27b2c86c75
1 changed files with 42 additions and 0 deletions
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42
test_runner/performance/test_lfc_prefetch.py
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@@ -92,3 +92,45 @@ def test_lfc_prefetch(neon_simple_env: NeonEnv, n_readers: int, n_writers: int):
t.join()
for t in writers:
t.join()
@pytest.mark.skipif(not USE_LFC, reason="LFC is disabled, skipping")
def test_lfc_async_prefetch_performance(neon_simple_env: NeonEnv, zenbenchmark):
"""
Test resizing the Local File Cache
"""
env = neon_simple_env
endpoint = env.endpoints.create_start(
"main",
config_lines=[
"neon.max_file_cache_size=100MB",
"neon.file_cache_size_limit=100MB",
"effective_io_concurrency=100",
"shared_buffers=1MB",
"enable_bitmapscan=off",
"enable_seqscan=off",
"autovacuum=off",
],
)
n_records = 100000 # 800Mb table
n_iterations = 1000
conn = endpoint.connect()
cur = conn.cursor()
cur.execute(
"create table account(id integer primary key, balance integer default 0, filler text default repeat('?',1000)) with (fillfactor=10)"
)
cur.execute(f"insert into account values (generate_series(1,{n_records}))")
cur.execute("vacuum account")
with zenbenchmark.record_duration("do_not_store_store_prefetch_results"):
cur.execute("set neon.store_prefetch_result_in_lfc=off")
for _ in range(n_iterations):
cur.execute("select sum(balance) from (select balance from account where id between 1000 and 2000 limit 100) s")
cur.execute("select sum(balance) from (select balance from account where id between 6000 and 7000 limit 100) s")
with zenbenchmark.record_duration("store_prefetch_results"):
cur.execute("set neon.store_prefetch_result_in_lfc=on")
for _ in range(n_iterations):
cur.execute("select sum(balance) from (select balance from account where id between 1000 and 2000 limit 100) s")
cur.execute("select sum(balance) from (select balance from account where id between 6000 and 7000 limit 100) s")