Profiling a Jar's Memory and CPU Usage

Question

When running a Java jar application, what's the best way to benchmark the CPU and memory usage accurately? I'm currently using VisualVM but I want a plugin or something that I can attach to the pom or project if possible.

Additional: How about in a serverless app like Spring?

Answer 1

You can use Spring Boot Actuator for monitoring. Add spring-boot-starter-actuator dependency, configure application.properties or .yaml file and you can see cpu usage with HTTP request.

Also java provide this structure with MXBean . If you want you can create your own MBean server and show CPU usage on jconsole.

public void exampleCPUUsageWithMXBean() {
    long previousJvmProcessCpuTime = 0;
    long previousJvmUptime = 0;
    com.sun.management.OperatingSystemMXBean prepareOperatingSystemMXBean = ManagementFactory.getPlatformMXBean(OperatingSystemMXBean.class);
    java.lang.management.OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean();
    RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();

    long elapsedProcessCpuTime = prepareOperatingSystemMXBean.getProcessCpuTime() - previousJvmProcessCpuTime;
    // elapsed uptime is in milliseconds
    long elapsedJvmUptime = runtimeMXBean.getUptime() - previousJvmUptime;

    // total jvm uptime on all the available processors
    long totalElapsedJvmUptime = elapsedJvmUptime * operatingSystemMXBean.getAvailableProcessors();

    float cpuUsage = elapsedProcessCpuTime / (totalElapsedJvmUptime * 10000F);

    System.out.println(cpuUsage);

}

Note: I recommend Java Mission Control tool. This tool very useful and showing all details.