test/gc/arguments/TestAggressiveHeap.java

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/*
 * @test TestAggressiveHeap
 * @key gc
 * @bug 8179084
 * @summary Test argument processing for -XX:+AggressiveHeap.
 * @library /testlibrary
 * @run driver TestAggressiveHeap
 */

import java.lang.management.ManagementFactory;
import javax.management.MBeanServer;
import javax.management.ObjectName;

import com.oracle.java.testlibrary.OutputAnalyzer;
import com.oracle.java.testlibrary.ProcessTools;

public class TestAggressiveHeap {

    public static void main(String args[]) throws Exception {
        if (canUseAggressiveHeapOption()) {
            testFlag();
        }
    }

    // Note: Not a normal boolean flag; -XX:-AggressiveHeap is invalid.
    private static final String option = "-XX:+AggressiveHeap";

    // Option requires at least 256M, else error during option processing.
    private static final long minMemory = 256 * 1024 * 1024;

    // bool UseParallelGC := true {product}
    private static final String parallelGCPattern =
        " *bool +UseParallelGC *:= *true +\\{product\\}";

    private static void testFlag() throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            option, "-XX:+PrintFlagsFinal", "-version");

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

        output.shouldHaveExitValue(0);

        String value = output.firstMatch(parallelGCPattern);
        if (value == null) {
            throw new RuntimeException(
                option + " didn't set UseParallelGC");
        }
    }

    private static boolean haveRequiredMemory() throws Exception {
        MBeanServer server = ManagementFactory.getPlatformMBeanServer();
        ObjectName os = new ObjectName("java.lang", "type", "OperatingSystem");
        Object attr = server.getAttribute(os, "TotalPhysicalMemorySize");
        String value = attr.toString();
        long memory = Long.parseLong(value);
        return memory >= minMemory;
    }

    private static boolean canUseAggressiveHeapOption() throws Exception {
        if (!haveRequiredMemory()) {
            System.out.println(
                "Skipping test of " + option + " : insufficient memory");
            return false;
        }
        return true;
    }
}