test/gc/concurrentMarkSweep/CheckAllocateAndSystemGC.java

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 * 2 along with this work; if not, write to the Free Software Foundation,
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/**
 * @test CheckAllocateAndSystemGC
 * @summary CMS: assert(used() == used_after_gc && used_after_gc <= capacity()) failed: used: 0 used_after_gc: 292080 capacity: 1431699456
 * @bug 8013032
 * @key gc
 * @key regression
 * @library /testlibrary
 * @run main/othervm CheckAllocateAndSystemGC
 * @author jon.masamitsu@oracle.com
 */

import com.oracle.java.testlibrary.*;

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

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
      "-showversion",
      "-XX:+UseConcMarkSweepGC",
      "-Xmn4m",
      "-XX:MaxTenuringThreshold=1",
      "-XX:-UseCMSCompactAtFullCollection",
      "CheckAllocateAndSystemGC$AllocateAndSystemGC"
      );

    OutputAnalyzer output = new OutputAnalyzer(pb.start());

    output.shouldNotContain("error");

    output.shouldHaveExitValue(0);
  }
  static class AllocateAndSystemGC {
    public static void main(String [] args) {
      Integer x[] = new Integer [1000];
      // Allocate enough objects to cause a minor collection.
      // These allocations suffice for a 4m young geneneration.
      for (int i = 0; i < 100; i++) {
        Integer y[] = new Integer[10000];
      }
      System.gc();
    }
  }
}