test/serviceability/tmtools/jstat/GcCauseTest02.java

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   * @test
   * @summary Test checks output displayed with jstat -gccause.
   *          Test scenario:
   *          tests forces debuggee application eat ~70% of heap and runs jstat.
   *          jstat should show that ~70% of heap (OC/OU ~= 70%).
+  * @requires vm.opt.ExplicitGCInvokesConcurrent != true
   * @modules java.base/jdk.internal.misc
   * @library /test/lib
   * @library ../share
   * @run main/othervm -XX:+UsePerfData -XX:InitialHeapSize=128M -XX:MaxHeapSize=128M -XX:MaxMetaspaceSize=128M GcCauseTest02
   */