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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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/*

 * @test

 * @summary Test checks output displayed with jstat -gc.

 *          Test scenario:

 *          test several times provokes garbage collection

 *          in the debuggee application

 *          and after each garbage collection runs jstat.

 *          jstat should show that after garbage collection

 *          number of GC events and garbage

 *          collection time increase.

 * @modules java.base/jdk.internal.misc

 * @library /test/lib

 * @library ../share

 * @requires vm.opt.ExplicitGCInvokesConcurrent != true

 * @run main/othervm -XX:+UsePerfData -Xmx128M GcTest01

 */

import utils.*;

public class GcTest01 {

    public static void main(String[] args) throws Exception {

        // We will be running "jstat -gc" tool

        JstatGcTool jstatGcTool = new JstatGcTool(ProcessHandle.current().pid());

        // Run once and get the  results asserting that they are reasonable

        JstatGcResults measurement1 = jstatGcTool.measure();

        measurement1.assertConsistency();

        GcProvoker gcProvoker = new GcProvoker();

        // Provoke GC then run the tool again and get the results

        // asserting that they are reasonable

        gcProvoker.provokeGc();

        JstatGcResults measurement2 = jstatGcTool.measure();

        measurement2.assertConsistency();

        // Assert the increase in GC events and time between the measurements

        JstatResults.assertGCEventsIncreased(measurement1, measurement2);

        JstatResults.assertGCTimeIncreased(measurement1, measurement2);

        // Provoke GC again and get the results

        // asserting that they are reasonable

        gcProvoker.provokeGc();

        JstatGcResults measurement3 = jstatGcTool.measure();

        measurement3.assertConsistency();

        // Assert the increase in GC events and time between the measurements

        JstatResults.assertGCEventsIncreased(measurement2, measurement3);

        JstatResults.assertGCTimeIncreased(measurement2, measurement3);

    }

}