[ci skip] (#2770)

benchmark.cfg.example

@@ -16,7 +16,7 @@ install_error_action=continue
 install_strategy=unified
 install_only=False
 list_tests=False
-concurrency_levels=[8, 16, 32, 64, 128, 256]
+concurrency_levels=[16, 32, 64, 128, 256, 512]
 query_levels=[1, 5,10,15,20]
 mode=benchmark
 sleep=60