ClickHouse/dbms/tests/queries/0_stateless/00913_many_threads.sql

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2019-03-04 19:29:23 +00:00
-- This test creates many threads to test a case when ThreadPool will remove some threads from pool after job is done.
SET max_block_size = 1, min_insert_block_size_rows = 0, min_insert_block_size_bytes = 0;
USE test;
2019-03-04 19:29:23 +00:00
CREATE TEMPORARY TABLE t (x UInt64);
INSERT INTO t SELECT * FROM system.numbers LIMIT 1500;
SELECT DISTINCT blockSize() FROM t;
SET max_threads = 1500;
SELECT count() FROM t;
SELECT sum(sleep(0.1)) FROM t; -- All threads have time to be created.
SELECT 'Ok.';