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：

publicstaticstringGetInstanceName(stringcategoryName,stringcounterName,Processp){try{PerformanceCounterCategoryprocesscounter=newPerformanceCounterCategory(categoryName);string[]instances=processcounter.GetInstanceNames();foreach(stringinstanceininstances){PerformanceCountercounter=newPerformanceCounter(categoryName,counterName,instance);//Logger.Info("对比inmothodGetInstanceName，"+counter.NextValue()+"："+p.Id);if(counter.NextValue()==p.Id){returninstance;}}}catch(Exceptionex){}returnnull;}


获取cpu占用率的PerformanceCounter：

stringinstance1=GetInstanceName("Process","IDProcess",p);if(instance1!=null){PerformanceCountercpucounter=newPerformanceCounter("Process","%ProcessorTime",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returncpucounter;}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PerformanceCounterstringinstance2=GetInstanceName(".NETCLRMemory","ProcessID",p);if(instance2!=null){PerformanceCountergccounter=newPerformanceCounter(".NETCLRMemory","%TimeinGC",instance2);if(gccounter!=null){returngccounter;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);}