监控每个进程占用的cpu，比如任务管理器的进程tab中的CPU

在代码里，可以通过新建PerformanceCounter来建立监控，其对应的Windows中的自带性能分析工具Perfmon

看下该类的定义中，只要有三个概念：

categoryName:

The name of the performance counter category (performance object) with which

this performance counter is associated.

counterName:

The name of the performance counter.

instanceName:

The name of the performance counter category instance, or an empty string

(""), if the category contains a single instance.

其对应关系如下：

由于instance是变化的，所以每次要根据Process得到instance，那么process跟instance间的关系如何，请看：

PerformanceCounter("Process", "ID Process", instance)这个指标取NextValue()就是ProcessID，就可以跟Process对应起来

但是注意，每个Catagory下面的instance都是不同的，，所有Process下的instance到其他Category下就不识别了。

获取instance代码如下：

public static string GetInstanceName(string categoryName, string counterName, Process p)         {             try             {                 PerformanceCounterCategory processcounter = new PerformanceCounterCategory(categoryName);                 string[] instances = processcounter.GetInstanceNames();                 foreach (string instance in instances)                 {                     PerformanceCounter counter = new PerformanceCounter(categoryName, counterName, instance);                     //Logger.Info("对比in mothod GetInstanceName，" + counter.NextValue() + "：" + p.Id);                     if (counter.NextValue() == p.Id)                     {                         return instance;                     }                 }             }             catch (Exception ex)             {             }             return null;         }

获取cpu占用率的PerformanceCounter：

string instance1 = GetInstanceName("Process", "ID Process", p);             if (instance1 != null)             {                 PerformanceCounter cpucounter = new PerformanceCounter("Process", "% Processor Time", instance1);                 if (cpucounter != null)                 {                     cpucounter.NextValue();                     System.Threading.Thread.Sleep(200); //等200ms(是测出能换取下个样本的最小时间间隔)，让后系统获取下一个样本,因为第一个样本无效                     return cpucounter;                 }                 else                 {                     Logger.Info("Name:" + name + "生成CPU监控失败" + instance1);                 }                            }             else             {                 Logger.Info("Name:" + name + "获取cpu监控实例失败" + instance1);             }

获取GC占用率的PerformanceCounter：

GC选取了PerformanceCounter(".NET CLR Memory", "% Time in GC", instance2)这个counter，但注意，这两个属于不同Category，所以instance不能共用