我想在 C# 中获取应用程序的总体总 CPU 使用率。我找到了很多方法来挖掘进程的属性,但我只想要进程的 CPU 使用率,以及你在 TaskManager 中获得的总 CPU。
我怎么做?
您可以使用System.Diagnostics中的PerformanceCounter类。
像这样初始化:
PerformanceCounter cpuCounter;
PerformanceCounter ramCounter;
cpuCounter = new PerformanceCounter("Processor", "% Processor Time", "_Total");
ramCounter = new PerformanceCounter("Memory", "Available MBytes");
像这样消费:
public string getCurrentCpuUsage(){
return cpuCounter.NextValue()+"%";
}
public string getAvailableRAM(){
return ramCounter.NextValue()+"MB";
}
比要求的多一点,但我使用额外的计时器代码来跟踪和提醒 CPU 使用率是否持续 1 分钟或更长时间的 90% 或更高。
public class Form1
{
int totalHits = 0;
public object getCPUCounter()
{
PerformanceCounter cpuCounter = new PerformanceCounter();
cpuCounter.CategoryName = "Processor";
cpuCounter.CounterName = "% Processor Time";
cpuCounter.InstanceName = "_Total";
// will always start at 0
dynamic firstValue = cpuCounter.NextValue();
System.Threading.Thread.Sleep(1000);
// now matches task manager reading
dynamic secondValue = cpuCounter.NextValue();
return secondValue;
}
private void Timer1_Tick(Object sender, EventArgs e)
{
int cpuPercent = (int)getCPUCounter();
if (cpuPercent >= 90)
{
totalHits = totalHits + 1;
if (totalHits == 60)
{
Interaction.MsgBox("ALERT 90% usage for 1 minute");
totalHits = 0;
}
}
else
{
totalHits = 0;
}
Label1.Text = cpuPercent + " % CPU";
//Label2.Text = getRAMCounter() + " RAM Free";
Label3.Text = totalHits + " seconds over 20% usage";
}
}
在花了一些时间阅读了几个看起来很复杂的不同线程之后,我想出了这个。我需要一台 8 核机器来监控 SQL 服务器。对于下面的代码,我将“sqlservr”作为 appName 传入。
private static void RunTest(string appName)
{
bool done = false;
PerformanceCounter total_cpu = new PerformanceCounter("Process", "% Processor Time", "_Total");
PerformanceCounter process_cpu = new PerformanceCounter("Process", "% Processor Time", appName);
while (!done)
{
float t = total_cpu.NextValue();
float p = process_cpu.NextValue();
Console.WriteLine(String.Format("_Total = {0} App = {1} {2}%\n", t, p, p / t * 100));
System.Threading.Thread.Sleep(1000);
}
}
它似乎正确测量了我的 8 核服务器上 SQL 使用的 CPU 百分比。
It's OK, I got it! Thanks for your help!
Here is the code to do it:
private void button1_Click(object sender, EventArgs e)
{
selectedServer = "JS000943";
listBox1.Items.Add(GetProcessorIdleTime(selectedServer).ToString());
}
private static int GetProcessorIdleTime(string selectedServer)
{
try
{
var searcher = new
ManagementObjectSearcher
(@"\\"+ selectedServer +@"\root\CIMV2",
"SELECT * FROM Win32_PerfFormattedData_PerfOS_Processor WHERE Name=\"_Total\"");
ManagementObjectCollection collection = searcher.Get();
ManagementObject queryObj = collection.Cast<ManagementObject>().First();
return Convert.ToInt32(queryObj["PercentIdleTime"]);
}
catch (ManagementException e)
{
MessageBox.Show("An error occurred while querying for WMI data: " + e.Message);
}
return -1;
}
您可以使用 WMI 获取 CPU 百分比信息。如果您拥有正确的权限,您甚至可以登录到远程计算机。查看http://www.csharphelp.com/archives2/archive334.html以了解您可以完成的工作。
也有帮助的可能是 MSDN 参考Win32_Process。
另请参阅 CodeProject 示例How To: (Almost) Everything In WMI via C#。
CMS 是正确的,但如果您在 Visual Studio 中使用服务器资源管理器并使用性能计数器选项卡,那么您可以弄清楚如何获得许多有用的指标。
此类每 1 秒自动轮询一次计数器,并且也是线程安全的:
public class ProcessorUsage
{
const float sampleFrequencyMillis = 1000;
protected object syncLock = new object();
protected PerformanceCounter counter;
protected float lastSample;
protected DateTime lastSampleTime;
/// <summary>
///
/// </summary>
public ProcessorUsage()
{
this.counter = new PerformanceCounter("Processor", "% Processor Time", "_Total", true);
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public float GetCurrentValue()
{
if ((DateTime.UtcNow - lastSampleTime).TotalMilliseconds > sampleFrequencyMillis)
{
lock (syncLock)
{
if ((DateTime.UtcNow - lastSampleTime).TotalMilliseconds > sampleFrequencyMillis)
{
lastSample = counter.NextValue();
lastSampleTime = DateTime.UtcNow;
}
}
}
return lastSample;
}
}
这似乎对我有用,一个等待处理器达到一定百分比的例子
var cpuCounter = new PerformanceCounter("Processor", "% Processor Time", "_Total");
int usage = (int) cpuCounter.NextValue();
while (usage == 0 || usage > 80)
{
Thread.Sleep(250);
usage = (int)cpuCounter.NextValue();
}
我不喜欢在所有PerformanceCounter
解决方案中添加 1 秒的停顿。相反,我选择使用WMI
解决方案。存在 1 秒等待/停顿的原因是为了在使用PerformanceCounter
. 但是,如果您经常调用此方法并刷新此信息,我建议不要经常产生延迟......即使考虑执行异步进程来获取它。
我从这里的代码片段开始使用 C# 在 WMI 中返回 CPU 使用情况,并在下面的博客文章中添加了对该解决方案的完整说明:
public int GetCpuUsage()
{
var cpuCounter = new PerformanceCounter("Processor", "% Processor Time", "_Total", Environment.MachineName);
cpuCounter.NextValue();
System.Threading.Thread.Sleep(1000); //This avoid that answer always 0
return (int)cpuCounter.NextValue();
}
此链接中的原始信息https://gavindraper.com/2011/03/01/retrieving-accurate-cpu-usage-in-c/