Java 获取 CPU 核的使用百分比

Question

我想获得所有内核的总 CPU 使用率。我需要打印这样的东西：

Cpu 1: 33%
Cpu 2: 12%
Cpu 3: 66%
Cpu 4: 100%

我尝试使用此代码：

OperatingSystemMXBean operatingSystemMXBean = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();
int availableProcessors = operatingSystemMXBean.getAvailableProcessors();
long prevUpTime = runtimeMXBean.getUptime();
long prevProcessCpuTime = operatingSystemMXBean.getProcessCpuTime();
double cpuUsage;
try
{
    Thread.sleep(500);
}
catch (Exception ignored) { }

operatingSystemMXBean = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
long upTime = runtimeMXBean.getUptime();
long processCpuTime = operatingSystemMXBean.getProcessCpuTime();
long elapsedCpu = processCpuTime - prevProcessCpuTime;
long elapsedTime = upTime - prevUpTime;

cpuUsage = Math.min(99F, elapsedCpu / (elapsedTime * 10000F * availableProcessors));
System.out.println("Java CPU: " + cpuUsage);

但是这段代码给我的输出是这样的：Java CPU: 27.504911422729492。有人可以帮我解决这个问题吗？

Answer 1

JavaSysMon uses OS-specific approach e.g. on Linux it parses /proc/cpuinfo to enumerate the cores. For the actual CPU core utilisation it parses the /proc/stat file (see LinuxMonitor).

Java 获取 CPU 核的使用百分比

Java get CPU usage percentage of cores

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