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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); }
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