I want to get the overall total CPU usage for an application in C#. I've found many ways to dig into the properties of processes, but I only want the CPU usage of the processes, and the total CPU like you get in the TaskManager.
How do I do that?
You can use the PerformanceCounter class from System.Diagnostics.
Initialize like this:
PerformanceCounter cpuCounter;
PerformanceCounter ramCounter;
cpuCounter = new PerformanceCounter("Processor", "% Processor Time", "_Total");
ramCounter = new PerformanceCounter("Memory", "Available MBytes");
Consume like this:
public string getCurrentCpuUsage(){
return cpuCounter.NextValue()+"%";
}
public string getAvailableRAM(){
return ramCounter.NextValue()+"MB";
}
A little more than was requsted but I use the extra timer code to track and alert if CPU usage is 90% or higher for a sustained period of 1 minute or longer.
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";
}
}
After spending some time reading over a couple different threads that seemed pretty complicated I came up with this. I needed it for an 8 core machine where I wanted to monitor SQL server. For the code below then I passed in "sqlservr" as appName.
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);
}
}
It seems to correctly measure the % of CPU being used by SQL on my 8 core server.
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;
}
You can use WMI to get CPU percentage information. You can even log into a remote computer if you have the correct permissions. Look at http://www.csharphelp.com/archives2/archive334.html to get an idea of what you can accomplish.
Also helpful might be the MSDN reference for the Win32_Process namespace.
See also a CodeProject example How To: (Almost) Everything In WMI via C#.
CMS has it right, but also if you use the server explorer in visual studio and play around with the performance counter tab then you can figure out how to get lots of useful metrics.
This class automatically polls the counter every 1 seconds and is also thread safe:
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;
}
}
For those who still could not get the total CPU usage figure which matches Task Manager, you should use this statement:
new PerformanceCounter("Processor Information", "% Processor Utility", "_Total");
This seems to work for me, an example for waiting until the processor reaches a certain percentage
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();
}
I did not like having to add in the 1 second stall to all of the PerformanceCounter solutions. Instead I chose to use a WMI solution. The reason the 1 second wait/stall exists is to allow the reading to be accurate when using a PerformanceCounter. However if you calling this method often and refreshing this information, I'd advise not to constantly have to incur that delay... even if thinking of doing an async process to get it.
I started with the snippet from here Returning CPU usage in WMI using C# and added a full explanation of the solution on my blog post below:
Get CPU Usage Across All Cores In C# Using WMI
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();
}
Original information in this link https://gavindraper.com/2011/03/01/retrieving-accurate-cpu-usage-in-c/
Related
The existing question suggests CurrentClockSpeed, but in my system, it just returns the same value as MaxClockSpeed. The code below prints out the same two values over and over again.
Task.Run(() =>
{
ManagementObject Mo = new ManagementObject("Win32_Processor.DeviceID='CPU0'");
while (true)
{
Debug.WriteLine("Max=" + Mo["MaxClockSpeed"] + ", Current=" + Mo["CurrentClockSpeed"]);
System.Threading.Thread.Sleep(1000);
}
Mo.Dispose(); //return and such later in the code
});
But all other applications like Task Manager, CPU-Z, Hardware Info, etc, show variable clock speed. That is, if I run a process that uses 100% of the CPU, the speed goes up, and if I terminate that process, it goes down. How can I get THAT value?
I mean, for example, the value in the "Speed" section of the screenshot I found in Google Search. Not the "Maximum speed" value that never changes.
If you mean CPU current usage processes
use this function in seperate thread :
private void get_cpuUsage()
{
try
{
string processname = System.Reflection.Assembly.GetExecutingAssembly().GetName().Name;
var perfCounter = new PerformanceCounter("Process", "% Processor Time", processname);
int coreCount = 0;
foreach (var item in new System.Management.ManagementObjectSearcher("Select * from Win32_Processor").Get())
{
coreCount += int.Parse(item["NumberOfCores"].ToString());
}
while (true)
{
Thread.Sleep(500);
double perfVal = perfCounter.NextValue() / Environment.ProcessorCount;
int cpu = (int)Math.Round(perfVal, 0);// /
double cpuvalue = Math.Round(perfVal, 1);
Invoke((MethodInvoker)delegate
{
cpu_bar.Text = cpuvalue.ToString(); // diaplay current % processes
});
}
}
catch(Exception ex)
{
messagebox.show(ex.message);
}
}
I'm trying to implement a program which can monitor the System usage statistics and report/alert when the usage (Configured in the program config. settings) go beyond the provided limit.
I tried PerformanceCounter and ManagementObjectSearcher to fetch and compare with Task Manager CPU usage but not getting the values even close to the taskmanager values.
Currently, I am following this link Link
Source Code
class Program
{
static List<float> AvailableCPU = new List<float>();
static List<float> AvailableRAM = new List<float>();
protected static PerformanceCounter cpuCounter;
protected static PerformanceCounter ramCounter;
static List<PerformanceCounter> cpuCounters = new List<PerformanceCounter>();
static int cores = 0;
static void Main(string[] args)
{
cpuCounter = new PerformanceCounter();
cpuCounter.CategoryName = "Processor";
cpuCounter.CounterName = "% Processor Time";
cpuCounter.InstanceName = "_Total";
foreach (var item in new System.Management.ManagementObjectSearcher("Select * from Win32_Processor").Get())
{
cores = cores + int.Parse(item["NumberOfCores"].ToString());
}
ramCounter = new PerformanceCounter("Memory", "Available MBytes");
int procCount = System.Environment.ProcessorCount;
for (int i = 0; i < procCount; i++)
{
System.Diagnostics.PerformanceCounter pc = new System.Diagnostics.PerformanceCounter("Processor", "% Processor Time", i.ToString());
cpuCounters.Add(pc);
}
Thread c = new Thread(ConsumeCPU);
c.IsBackground = true;
c.Start();
try
{
System.Timers.Timer t = new System.Timers.Timer(1200);
t.Elapsed += new ElapsedEventHandler(TimerElapsed);
t.Start();
Thread.Sleep(10000);
}
catch (Exception e)
{
Console.WriteLine("catched exception");
}
Console.ReadLine();
}
public static void ConsumeCPU()
{
int percentage = 60;
if (percentage < 0 || percentage > 100)
throw new ArgumentException("percentage");
Stopwatch watch = new Stopwatch();
watch.Start();
while (true)
{
// Make the loop go on for "percentage" milliseconds then sleep the
// remaining percentage milliseconds. So 40% utilization means work 40ms and sleep 60ms
if (watch.ElapsedMilliseconds > percentage)
{
Thread.Sleep(100 - percentage);
watch.Reset();
watch.Start();
}
}
}
public static void TimerElapsed(object source, ElapsedEventArgs e)
{
float cpu = cpuCounter.NextValue();
float sum = 0;
foreach (PerformanceCounter c in cpuCounters)
{
sum = sum + c.NextValue();
}
sum = sum / (cores);
float ram = ramCounter.NextValue();
Console.WriteLine(string.Format("CPU Value 1: {0}, cpu value 2: {1} ,ram value: {2}", sum, cpu, ram));
AvailableCPU.Add(sum);
AvailableRAM.Add(ram);
}
}
At times it goes beyond 100%. Please suggest some method which can help me fetch the CPU usage somewhere close to the TaskManager values.
How can I get in c# the CPU frequency (example : 2Ghz) ?
It's simple but I don't find it in the environnement variables.
Thanks :)
var searcher = new ManagementObjectSearcher(
"select MaxClockSpeed from Win32_Processor");
foreach (var item in searcher.Get())
{
var clockSpeed = (uint)item["MaxClockSpeed"];
}
if you wish to get other fields look at class Win32_processor
Try this code
using System.Management;
uint currentsp , Maxsp;
public void CPUSpeed()
{
using(ManagementObject Mo = new ManagementObject("Win32_Processor.DeviceID='CPU0'"))
{
currentsp = (uint)(Mo["CurrentClockSpeed"]);
Maxsp = (uint)(Mo["MaxClockSpeed"]);
}
}
If you want to get the turbo speed, you can make use of the "% Processor Performance" performance counter and multiply it with the WMI "MaxClockSpeed" as follows:
private string GetCPUInfo()
{
PerformanceCounter cpuCounter = new PerformanceCounter("Processor Information", "% Processor Performance", "_Total");
double cpuValue = cpuCounter.NextValue();
Thread loop = new Thread(() => InfiniteLoop());
loop.Start();
Thread.Sleep(1000);
cpuValue = cpuCounter.NextValue();
loop.Abort();
foreach (ManagementObject obj in new ManagementObjectSearcher("SELECT *, Name FROM Win32_Processor").Get())
{
double maxSpeed = Convert.ToDouble(obj["MaxClockSpeed"]) / 1000;
double turboSpeed = maxSpeed * cpuValue / 100;
return string.Format("{0} Running at {1:0.00}Ghz, Turbo Speed: {2:0.00}Ghz", obj["Name"], maxSpeed, turboSpeed);
}
return string.Empty;
}
The InfiniteLoop method is simply an integer that gets 1 added and subtracted:
private void InfiniteLoop()
{
int i = 0;
while (true)
i = i + 1 - 1;
}
The InfiniteLoop method is just added to give the CPU something to do and turbo in the process. The loop is allowed to run for a second before the next value is taken and the loop aborted.
One could take the information out of the registry, but dunno if it works on Windows XP or older (mine is Windows 7).
HKEY_LOCAL_MACHINE/HARDWARE/DESCRIPTION/CentralProcessor/0/ProcessorName
reads like
Intel(R) Core(TM)2 Quad CPU Q6600 # 2.40GHz
for me.
Something like this code could retrieve the information (not tested):
RegistryKey processor_name = Registry.LocalMachine.OpenSubKey(#"Hardware\Description\System\CentralProcessor\0", RegistryKeyPermissionCheck.ReadSubTree);
if (processor_name != null)
{
if (processor_name.GetValue("ProcessorNameString") != null)
{
string value = processor_name.GetValue("ProcessorNameString");
string freq = value.Split('#')[1];
...
}
}
(source: here)
You can get it via WMI, but it's quite slow so if you're going to be getting it on more than one occasion I'd suggest you cache it - something like:
namespace Helpers
{
using System.Management;
public static class HardwareHelpers
{
private static uint? maxCpuSpeed = null;
public static uint MaxCpuSpeed
{
get
{
return maxCpuSpeed.HasValue ? maxCpuSpeed.Value : (maxCpuSpeed = GetMaxCpuSpeed()).Value;
}
}
private static uint GetMaxCpuSpeed()
{
using (var managementObject = new ManagementObject("Win32_Processor.DeviceID='CPU0'"))
{
var sp = (uint)(managementObject["MaxClockSpeed"]);
return sp;
}
}
}
}
I have multiple tasks in an array, that are used to compute prime numbers in a given range. To undergo a comparison of tasks vs thread performance, I want to use threads within tasks and then check the performance stats.
How will the threads be used with tasks, so far this is what I have done:
public Form1()
{
InitializeComponent();
cpuCounter = new PerformanceCounter();
cpuCounter.CategoryName = "Processor";
cpuCounter.CounterName = "% Processor Time";
cpuCounter.InstanceName = "_Total";
ramCounter = new PerformanceCounter("Memory", "Available MBytes");
this.scheduler = TaskScheduler.FromCurrentSynchronizationContext();
this.numericUpDown1.Maximum = int.MaxValue;
}
private void btnCalculate_Click(object sender, EventArgs e)
{
//get the lower and upper bounds for prime range
int lower = int.Parse(this.numericUpDown1.Value.ToString());
int upper = 0 ;
//get the time in milliseconds for task deadline
int taskDeadline = int.Parse(this.time.Text);
//determine tasks completed
int tasksCompleted = 0;
Random random = new Random();
for (int taskCount = 1; taskCount <= 1; ++taskCount)
{
int taskArraySize = taskCount * 100;
Task[] taskArray = new Task[taskArraySize];
this.txtNumOfPrimes.Text += "Performing test for " +
taskArraySize.ToString() +
" tasks" +
Environment.NewLine +
Environment.NewLine;
for (int i = 0; i < taskArray.Length; i++)
{
upper = random.Next(5, 10);
taskArray[i] = new Task(() => getPrimesInRange(lower, upper));
taskArray[i].Start();
bool timeout = taskArray[i].Wait(taskDeadline);
if (!timeout)
{
// If it hasn't finished at timeout display message
this.txtNumOfPrimes.Text +=
"Message to User: Task not completed, Status=> " +
taskArray[i].Status.ToString() +
Environment.NewLine;
}
else
{
this.txtNumOfPrimes.Text += "Task completed in timeout " +
", CPU usage: " + this.getCurrentCpuUsage() +
", RAM usage: " +
this.getAvailableRAM() +
Environment.NewLine;
tasksCompleted++;
}
}
}
this.txtNumOfPrimes.Text += Environment.NewLine;
this.txtNumOfPrimes.Text +=
"Tasks Completed: " +
tasksCompleted.ToString() +
Environment.NewLine;
}
The whole point of tasks is "simplifying the process of adding parallelism and concurrency to applications". Indeed (from http://msdn.microsoft.com/en-us/library/dd537609):
Behind the scenes, tasks are queued to the ThreadPool, which has been
enhanced with algorithms (like hill-climbing) that determine and
adjust to the number of threads that maximizes throughput. This makes
tasks relatively lightweight, and you can create many of them to
enable fine-grained parallelism. To complement this, widely-known
work-stealing algorithms are employed to provide load-balancing.
In short, tasks do the thread work without much of the hassle and legwork.
To compare the two, consider using Parrallel.ForEach for tasks. For example:
public class PrimeRange
{
public int Start;
public int Snd;
}
List<PrimeRange> primes = new []
{
new PrimeRange{Start = 0, End = 1000},
new PrimeRange{Start = 1001, End = 2000}
// An so on
};
Parallel.ForEach(primes, x => CalculatePrimes(x, OnResult())));
where CalculatePrimes is a method that takes a PrimeRange and a delegate to call when the primes have been calculated. Parraler.ForEach will start a task for each element of primes and run CalculatePrimes() on it and handle the thread assignment and scheduling for you.
To compare it to threads, use something like:
List<Thread> threads = new List<Thread>();
foreach(PrimeRange primeRange in primes)
{
threads = new Thread(CalculatePrimes).Start(x);
}
foreach(var thread in threads)
{
thread.Join();
}
where CalculatePrimes would need to also store the results (or something similar). See C# Waiting for multiple threads to finish for more information about waiting on running threads.
You could time the results using a StopWatch.
How can I get in c# the CPU frequency (example : 2Ghz) ?
It's simple but I don't find it in the environnement variables.
Thanks :)
var searcher = new ManagementObjectSearcher(
"select MaxClockSpeed from Win32_Processor");
foreach (var item in searcher.Get())
{
var clockSpeed = (uint)item["MaxClockSpeed"];
}
if you wish to get other fields look at class Win32_processor
Try this code
using System.Management;
uint currentsp , Maxsp;
public void CPUSpeed()
{
using(ManagementObject Mo = new ManagementObject("Win32_Processor.DeviceID='CPU0'"))
{
currentsp = (uint)(Mo["CurrentClockSpeed"]);
Maxsp = (uint)(Mo["MaxClockSpeed"]);
}
}
If you want to get the turbo speed, you can make use of the "% Processor Performance" performance counter and multiply it with the WMI "MaxClockSpeed" as follows:
private string GetCPUInfo()
{
PerformanceCounter cpuCounter = new PerformanceCounter("Processor Information", "% Processor Performance", "_Total");
double cpuValue = cpuCounter.NextValue();
Thread loop = new Thread(() => InfiniteLoop());
loop.Start();
Thread.Sleep(1000);
cpuValue = cpuCounter.NextValue();
loop.Abort();
foreach (ManagementObject obj in new ManagementObjectSearcher("SELECT *, Name FROM Win32_Processor").Get())
{
double maxSpeed = Convert.ToDouble(obj["MaxClockSpeed"]) / 1000;
double turboSpeed = maxSpeed * cpuValue / 100;
return string.Format("{0} Running at {1:0.00}Ghz, Turbo Speed: {2:0.00}Ghz", obj["Name"], maxSpeed, turboSpeed);
}
return string.Empty;
}
The InfiniteLoop method is simply an integer that gets 1 added and subtracted:
private void InfiniteLoop()
{
int i = 0;
while (true)
i = i + 1 - 1;
}
The InfiniteLoop method is just added to give the CPU something to do and turbo in the process. The loop is allowed to run for a second before the next value is taken and the loop aborted.
One could take the information out of the registry, but dunno if it works on Windows XP or older (mine is Windows 7).
HKEY_LOCAL_MACHINE/HARDWARE/DESCRIPTION/CentralProcessor/0/ProcessorName
reads like
Intel(R) Core(TM)2 Quad CPU Q6600 # 2.40GHz
for me.
Something like this code could retrieve the information (not tested):
RegistryKey processor_name = Registry.LocalMachine.OpenSubKey(#"Hardware\Description\System\CentralProcessor\0", RegistryKeyPermissionCheck.ReadSubTree);
if (processor_name != null)
{
if (processor_name.GetValue("ProcessorNameString") != null)
{
string value = processor_name.GetValue("ProcessorNameString");
string freq = value.Split('#')[1];
...
}
}
(source: here)
You can get it via WMI, but it's quite slow so if you're going to be getting it on more than one occasion I'd suggest you cache it - something like:
namespace Helpers
{
using System.Management;
public static class HardwareHelpers
{
private static uint? maxCpuSpeed = null;
public static uint MaxCpuSpeed
{
get
{
return maxCpuSpeed.HasValue ? maxCpuSpeed.Value : (maxCpuSpeed = GetMaxCpuSpeed()).Value;
}
}
private static uint GetMaxCpuSpeed()
{
using (var managementObject = new ManagementObject("Win32_Processor.DeviceID='CPU0'"))
{
var sp = (uint)(managementObject["MaxClockSpeed"]);
return sp;
}
}
}
}