Add test_unlogged for measuring effect of relkind cache

test_runner/performance/test_unlogged.py

@@ -0,0 +1,39 @@
+from __future__ import annotations
+
+import threading
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from fixtures.neon_fixtures import NeonEnvBuilder
+
+
+def test_unlogged(neon_env_builder: NeonEnvBuilder):
+    n_tables = 20
+    n_records = 1000
+    n_updates = 10
+    shared_buffers = 1
+
+    env = neon_env_builder.init_start()
+    endpoint = env.endpoints.create_start(
+        "main", config_lines=[f"shared_buffers='{shared_buffers}MB'"]
+    )
+
+    with endpoint.connect().cursor() as cur:
+        for i in range(n_tables):
+            cur.execute(
+                f"create unlogged table t{i}(pk integer primary key, sk integer, fillter text default repeat('x', 1000)) with (fillfactor=10)"
+            )
+            cur.execute(f"insert into t{i} values (generate_series(1,{n_records}),0)")
+
+    def do_updates(table_id: int):
+        with endpoint.connect().cursor() as cur:
+            for _ in range(n_updates):
+                cur.execute(f"update t{table_id} set sk=sk+1")
+
+    threads = [threading.Thread(target=do_updates, args=(i,)) for i in range(n_tables)]
+
+    for thread in threads:
+        thread.start()
+
+    for thread in threads:
+        thread.join()