test/hotspot/jtreg/containers/docker/TestCPUAwareness.java

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/*
 * @test
 * @key cgroups
 * @summary Test JVM's CPU resource awareness when running inside docker container
 * @requires docker.support
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.base/jdk.internal.platform
 *          java.management
 *          jdk.jartool/sun.tools.jar
 * @build PrintContainerInfo CheckOperatingSystemMXBean
 * @run driver TestCPUAwareness
 */
import java.util.List;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.containers.docker.Common;
import jdk.test.lib.containers.docker.DockerRunOptions;
import jdk.test.lib.containers.docker.DockerTestUtils;
import jdk.test.lib.containers.cgroup.CPUSetsReader;

public class TestCPUAwareness {
    private static final String imageName = Common.imageName("cpu");
    private static final int availableCPUs = Runtime.getRuntime().availableProcessors();

    public static void main(String[] args) throws Exception {
        if (!DockerTestUtils.canTestDocker()) {
            return;
        }

        System.out.println("Test Environment: detected availableCPUs = " + availableCPUs);
        DockerTestUtils.buildJdkContainerImage(imageName);

        try {
            // cpuset, period, shares, expected Active Processor Count
            testComboWithCpuSets();

            // leave one CPU for system and tools, otherwise this test may be unstable
            int maxNrOfAvailableCpus =  availableCPUs - 1;
            for (int i=1; i < maxNrOfAvailableCpus; i = i * 2) {
                testCpus(i, i);
            }

            // If ActiveProcessorCount is set, the VM should use it, regardless of other
            // container settings, host settings or available CPUs on the host.
            testActiveProcessorCount(1, 1);
            testActiveProcessorCount(2, 2);

            // cpu quota and period
            testCpuQuotaAndPeriod(50*1000, 100*1000, false);
            testCpuQuotaAndPeriod(100*1000, 100*1000, false);
            testCpuQuotaAndPeriod(150*1000, 100*1000, false);
            testCpuQuotaAndPeriod(400*1000, 100*1000, false);
            testCpuQuotaAndPeriod(50*1000, 100*1000, true /* additional cgroup mount */);

            testOperatingSystemMXBeanAwareness("0.5", "1");
            testOperatingSystemMXBeanAwareness("1.0", "1");
            if (availableCPUs > 2) {
                testOperatingSystemMXBeanAwareness("1.2", "2");
                testOperatingSystemMXBeanAwareness("1.8", "2");
                testOperatingSystemMXBeanAwareness("2.0", "2");
            }

        } finally {
            if (!DockerTestUtils.RETAIN_IMAGE_AFTER_TEST) {
                DockerTestUtils.removeDockerImage(imageName);
            }
        }
    }


    private static void testComboWithCpuSets() throws Exception {
        String cpuSetStr = CPUSetsReader.readFromProcStatus("Cpus_allowed_list");
        System.out.println("cpuSetStr = " + cpuSetStr);

        if (cpuSetStr == null) {
            System.out.printf("The cpuset test cases are skipped");
        } else {
            List<Integer> cpuSet = CPUSetsReader.parseCpuSet(cpuSetStr);

            // Test subset of cpuset with one element
            if (cpuSet.size() >= 1) {
                String testCpuSet = CPUSetsReader.listToString(cpuSet, 1);
                testAPCCombo(testCpuSet, 200*1000, 100*1000,   4*1024, 1);
            }

            // Test subset of cpuset with two elements
            if (cpuSet.size() >= 2) {
                String testCpuSet = CPUSetsReader.listToString(cpuSet, 2);
                testAPCCombo(testCpuSet, 200*1000, 100*1000, 4*1024, 2);
                testAPCCombo(testCpuSet, 200*1000, 100*1000, 1023,   2);
            }

            // Test subset of cpuset with three elements
            if (cpuSet.size() >= 3) {
                String testCpuSet = CPUSetsReader.listToString(cpuSet, 3);
                testAPCCombo(testCpuSet, 100*1000, 100*1000, 2*1024, 1);
                testAPCCombo(testCpuSet, 200*1000, 100*1000, 1023,   2);
            }
        }
    }


    private static void testActiveProcessorCount(int valueToSet, int expectedValue) throws Exception {
        Common.logNewTestCase("Test ActiveProcessorCount: valueToSet = " + valueToSet);

        DockerRunOptions opts = Common.newOpts(imageName)
            .addJavaOpts("-XX:ActiveProcessorCount=" + valueToSet, "-Xlog:os=trace");
        Common.run(opts)
            .shouldMatch("active processor count set by user.*" + expectedValue);
    }


    private static void testCpus(int valueToSet, int expectedTraceValue) throws Exception {
        Common.logNewTestCase("test cpus: " + valueToSet);
        DockerRunOptions opts = Common.newOpts(imageName)
            .addDockerOpts("--cpu-period=" + 10000)
            .addDockerOpts("--cpu-quota=" + valueToSet * 10000);
        Common.run(opts)
            .shouldMatch("active_processor_count.*" + expectedTraceValue);
    }


    // Expected active processor count can not exceed available CPU count
    private static int adjustExpectedAPCForAvailableCPUs(int expectedAPC) {
        if (expectedAPC > availableCPUs) {
            expectedAPC = availableCPUs;
            System.out.println("Adjusted expectedAPC = " + expectedAPC);
        }
        return expectedAPC;
    }


    private static void testCpuQuotaAndPeriod(int quota, int period, boolean addCgmounts)
        throws Exception {
        Common.logNewTestCase("test cpu quota and period: ");
        System.out.println("quota = " + quota);
        System.out.println("period = " + period);

        int expectedAPC = (int) Math.ceil((float) quota / (float) period);
        System.out.println("expectedAPC = " + expectedAPC);
        expectedAPC = adjustExpectedAPCForAvailableCPUs(expectedAPC);

        DockerRunOptions opts = Common.newOpts(imageName)
            .addDockerOpts("--cpu-period=" + period)
            .addDockerOpts("--cpu-quota=" + quota);

        if (addCgmounts) {
            opts = opts.addDockerOpts("--volume", "/sys/fs/cgroup:/cgroups-in:ro");
        }

        Common.run(opts)
            .shouldMatch("CPU Period is.*" + period)
            .shouldMatch("CPU Quota is.*" + quota)
            .shouldMatch("active_processor_count.*" + expectedAPC);
    }


    private static void testAPCCombo(String cpuset, int quota, int period, int shares,
                                     int expectedAPC) throws Exception {
        Common.logNewTestCase("test APC Combo");
        System.out.println("cpuset = " + cpuset);
        System.out.println("quota = " + quota);
        System.out.println("period = " + period);
        System.out.println("shares = " + shares);
        System.out.println("expectedAPC = " + expectedAPC);

        expectedAPC = adjustExpectedAPCForAvailableCPUs(expectedAPC);

        DockerRunOptions opts = Common.newOpts(imageName)
            .addDockerOpts("--cpuset-cpus", "" + cpuset)
            .addDockerOpts("--cpu-period=" + period)
            .addDockerOpts("--cpu-quota=" + quota)
            .addDockerOpts("--cpu-shares=" + shares);

        Common.run(opts)
            .shouldMatch("active_processor_count.*" + expectedAPC);
    }


    private static void testOperatingSystemMXBeanAwareness(String cpuAllocation, String expectedCpus) throws Exception {
        Common.logNewTestCase("Check OperatingSystemMXBean");

        DockerRunOptions opts = Common.newOpts(imageName, "CheckOperatingSystemMXBean")
            .addDockerOpts(
                "--cpus", cpuAllocation
            )
            // CheckOperatingSystemMXBean uses Metrics (jdk.internal.platform) for
            // diagnostics
            .addJavaOpts("--add-exports")
            .addJavaOpts("java.base/jdk.internal.platform=ALL-UNNAMED");

        DockerTestUtils.dockerRunJava(opts)
            .shouldHaveExitValue(0)
            .shouldContain("Checking OperatingSystemMXBean")
            .shouldContain("Runtime.availableProcessors: " + expectedCpus)
            .shouldContain("OperatingSystemMXBean.getAvailableProcessors: " + expectedCpus)
            .shouldMatch("OperatingSystemMXBean\\.getSystemCpuLoad: [0-9]+\\.[0-9]+")
            .shouldMatch("OperatingSystemMXBean\\.getCpuLoad: [0-9]+\\.[0-9]+")
            ;
    }
}