java - Java获取内核的CPU使用率百分比

我想获取所有内核的总CPU使用率。我需要打印如下内容：

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);

但是这段代码给了我这样的输出：Java CPU: 27.504911422729492。
有人可以帮我弄这个吗？

最佳答案

JavaSysMon使用特定于操作系统的方法，例如在Linux上，它解析/proc/cpuinfo以枚举内核。对于实际的CPU核心利用率，它解析/proc/stat文件（请参见LinuxMonitor）。