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root/jsr166/jsr166/src/test/tck/ConcurrentHashMapTest.java

Comparing jsr166/src/test/tck/ConcurrentHashMapTest.java (file contents):
Revision 1.50 by jsr166, Mon Aug 22 18:38:28 2016 UTC vs.
Revision 1.51 by jsr166, Sat Oct 15 18:51:12 2016 UTC

#	Line 837 | Line 837 | public class ConcurrentHashMapTest exten
837		assertEquals(mapSize, map.size());
838		}
839
840	–	/**
841	–	* Tests performance of computeIfAbsent when the element is present.
842	–	* See JDK-8161372
843	–	* ant -Djsr166.tckTestClass=ConcurrentHashMapTest -Djsr166.methodFilter=testcomputeIfAbsent_performance -Djsr166.expensiveTests=true tck
844	–	*/
845	–	public void testcomputeIfAbsent_performance() {
846	–	final int mapSize = 20;
847	–	final int iterations = expensiveTests ? (1 << 23) : mapSize * 2;
848	–	final int threads = expensiveTests ? 10 : 2;
849	–	final ConcurrentHashMap<Integer, Integer> map = new ConcurrentHashMap<>();
850	–	for (int i = 0; i < mapSize; i++)
851	–	map.put(i, i);
852	–	final ExecutorService pool = Executors.newFixedThreadPool(2);
853	–	try (PoolCleaner cleaner = cleaner(pool)) {
854	–	Runnable r = new CheckedRunnable() {
855	–	public void realRun() {
856	–	int result = 0;
857	–	for (int i = 0; i < iterations; i++)
858	–	result += map.computeIfAbsent(i % mapSize, (k) -> k + k);
859	–	if (result == -42) throw new Error();
860	–	}};
861	–	for (int i = 0; i < threads; i++)
862	–	pool.execute(r);
863	–	}
864	–	}
865	–
840		}

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