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监控每个进程占用的cpu，比如任务管理器的进程tab中的CPU
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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);
}