如何从java获取操作系统的CPU使用率百分比
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How to get percentage of CPU usage of OS from java
提问by G.S
I want to calculate percentage of CPU usage of OS from java code.
我想从 java 代码计算操作系统的 CPU 使用率的百分比。
- There are several ways to find it by
unixcommand [e.g. usingmpstat,/proc/statetc...] and use it fromRuntime.getRuntime().exec
- 有几种方法被找到它
unix的命令[例如，使用mpstat，/proc/stat等...]，并用它从Runtime.getRuntime().exec
But I don't want to use the system calls.
但我不想使用系统调用。
I tried ManagementFactory.getOperatingSystemMXBean()
我试过 ManagementFactory.getOperatingSystemMXBean()
OperatingSystemMXBean osBean =
(OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
System.out.println(osBean.getSystemLoadAverage());
But it gives the cpu load but not the cpu usage. Is there anyway to find the usage percentage?
但它提供了 cpu 负载而不是 cpu 使用率。反正有没有找到使用百分比？
回答by Julien
回答by isapir
In Java 7 you can get it like so:
在 Java 7 中，你可以这样得到它：
public static double getProcessCpuLoad() throws Exception {
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
ObjectName name = ObjectName.getInstance("java.lang:type=OperatingSystem");
AttributeList list = mbs.getAttributes(name, new String[]{ "ProcessCpuLoad" });
if (list.isEmpty()) return Double.NaN;
Attribute att = (Attribute)list.get(0);
Double value = (Double)att.getValue();
// usually takes a couple of seconds before we get real values
if (value == -1.0) return Double.NaN;
// returns a percentage value with 1 decimal point precision
return ((int)(value * 1000) / 10.0);
}
