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

代码如下：

// 获取GC占用率 PerformanceCounter            string instance2 = GetInstanceName(".NET CLR Memory", "Process ID", p);if (instance2 != null){PerformanceCounter gccounter = new PerformanceCounter(".NET CLR Memory", "% Time in GC", instance2);if (gccounter != null){return gccounter;Logger.Info("Name:" + name + "生成GC监控成功" + instance2);}else{Logger.Info("Name:" + name + "生成GC监控失败" + instance2);}}else{Logger.Info("Name:" + name + "获取GC监控实例失败" + instance2);}