ClickHouse/tests/performance/insert_parallel.xml

<test>
    <settings>
        <max_insert_threads>4</max_insert_threads>
    </settings>
    <create_query>CREATE TABLE t (x UInt64) ENGINE = Null</create_query>
    <query>INSERT INTO t SELECT * FROM numbers_mt(1000000000)</query>
    <drop_query>DROP TABLE IF EXISTS t</drop_query>
</test>