8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
Reviewed-by: pliden, stefank, eosterlund, ehelin, sjohanss, rbackman, coleenp, ihse, jgeorge, lmesnik, rkennke
Contributed-by: per.liden@oracle.com, stefan.karlsson@oracle.com, erik.osterlund@oracle.com, mikael.gerdin@oracle.com, kim.barrett@oracle.com, nils.eliasson@oracle.com, rickard.backman@oracle.com, rwestrel@redhat.com, coleen.phillimore@oracle.com, robbin.ehn@oracle.com, gerard.ziemski@oracle.com, hugh.wilkinson@intel.com, sandhya.viswanathan@intel.com, bill.npo.wheeler@intel.com, vinay.k.awasthi@intel.com, yasuenag@gmail.com
/*
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*/
import utils.*;
/*
* @test
* @summary Test checks the consistency of the output
* displayed with jstat -gccapacity.
* @requires vm.gc != "Z"
* @modules java.base/jdk.internal.misc
* @library /test/lib
* @library ../share
* @requires vm.opt.ExplicitGCInvokesConcurrent != true
* @run main/othervm -XX:+UsePerfData -Xmx128M GcCapacityTest
*/
public class GcCapacityTest {
public static void main(String[] args) throws Exception {
// We will be running "jstat -gc" tool
JstatGcCapacityTool jstatGcTool = new JstatGcCapacityTool(ProcessHandle.current().pid());
// Run once and get the results asserting that they are reasonable
JstatGcCapacityResults measurement1 = jstatGcTool.measure();
measurement1.assertConsistency();
// Provoke a gc and verify the changed values
GcProvoker gcProvoker = new GcProvoker();
gcProvoker.provokeGc();
JstatGcCapacityResults measurement2 = jstatGcTool.measure();
measurement2.assertConsistency();
// Assert that the GC events count has increased
JstatResults.assertGCEventsIncreased(measurement1, measurement2);
// Provoke a gc again and verify the changed values
gcProvoker.provokeGc();
JstatGcCapacityResults measurement3 = jstatGcTool.measure();
measurement3.assertConsistency();
// Assert that the GC events count has increased
JstatResults.assertGCEventsIncreased(measurement1, measurement2);
}
}