[英]Java get CPU usage percentage of cores
我想獲取所有內核的總CPU使用率。 我需要打印如下內容:
Cpu 1: 33%
Cpu 2: 12%
Cpu 3: 66%
Cpu 4: 100%
我嘗試使用此代碼:
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);
但是這段代碼給了我這樣的輸出: Java CPU: 27.504911422729492
。 有人可以幫我弄這個嗎?
JavaSysMon使用特定於操作系統的方法,例如,在Linux上,它解析/proc/cpuinfo
以枚舉內核。 對於實際的CPU核心利用率,它將解析/proc/stat
文件(請參閱LinuxMonitor )。
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