jdk-24/test/hotspot/jtreg/runtime/containers/docker/TestCPUAwareness.java

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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @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.management
 *          jdk.jartool/sun.tools.jar
 * @build Common
 * @run driver TestCPUAwareness
 */
import jdk.test.lib.containers.docker.DockerRunOptions;
import jdk.test.lib.containers.docker.DockerTestUtils;


public class TestCPUAwareness {
    private static final String imageName = Common.imageName("cpu");

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

        int availableCPUs = Runtime.getRuntime().availableProcessors();
        System.out.println("Test Environment: detected availableCPUs = " + availableCPUs);
        DockerTestUtils.buildJdkDockerImage(imageName, "Dockerfile-BasicTest", "jdk-docker");

        try {
            // cpuset, period, shares, expected Active Processor Count
            testAPCCombo("0", 200*1000, 100*1000,   4*1024, 1);
            testAPCCombo("0,1", 200*1000, 100*1000, 4*1024, 2);
            testAPCCombo("0,1", 200*1000, 100*1000, 1*1024, 2);

            testCpuShares(256, 1);
            testCpuShares(2048, 2);
            testCpuShares(4096, 4);

            // 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);

            testCpuQuotaAndPeriod(50*1000, 100*1000);
            testCpuQuotaAndPeriod(100*1000, 100*1000);
            testCpuQuotaAndPeriod(150*1000, 100*1000);

        } finally {
            DockerTestUtils.removeDockerImage(imageName);
        }
    }


    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("--cpus", "" + valueToSet);
        Common.run(opts)
            .shouldMatch("active_processor_count.*" + expectedTraceValue);
    }


    private static void testCpuQuotaAndPeriod(int quota, int period)
        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);

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

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


    // Test correctess of automatically selected active processor cound
    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 = " + period);
        System.out.println("expectedAPC = " + 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 testCpuShares(int shares, int expectedAPC) throws Exception {
        Common.logNewTestCase("test cpu shares, shares = " + shares);
        DockerRunOptions opts = Common.newOpts(imageName)
            .addDockerOpts("--cpu-shares=" + shares);
        Common.run(opts)
            .shouldMatch("CPU Shares is.*" + shares)
            .shouldMatch("active_processor_count.*" + expectedAPC);
    }
}