If CPU usage is 100% then close the all threads C#

Question

Hi

Using TPL i am able to consume all cores of my machine, but sometimes the CPU usage reached to 100%. My question is how can we forcefully tell to program the terminate the all threads which are currently using and reset the task again.

Below is my program -

Parallel.For(0, loopCount, parallelOptions, loopno =>

{

for (int i = 0; i < tDSInput.Tables[0].Rows.Count; i++)

{

////////Here i want to chk the CPU usage (if cpu usage is > 95%) then stop all running threads else normal execution.

var locker = new object();

Monitor.Enter(locker);

try

{

var tasks = Task.Factory.StartNew(() => ABC(), TaskCreationOptions.LongRunning)

.ContinueWith(t => DEF(), TaskContinuationOptions.ExecuteSynchronously)

.ContinueWith(t => GHI(), TaskContinuationOptions.ExecuteSynchronously)

.ContinueWith(t => JKL(), TaskContinuationOptions.ExecuteSynchronously)

....

.ContinueWith(t => XYZ(), TaskContinuationOptions.ExecuteSynchronously)

Task.WaitAll(tasks);

}

finally

{

Monitor.Exit(locker);

}

How do I do that?

Tapan Patel · Answer

First thing you need to do is to have all tasks starting with cancellation token.and while each of the threads is running you can run performanceCounter on main thread as below. If at any time performance goes to 100% you can set cancellation token that will cancel the threads. (Also there is no way to forcibly terminate the thread as it leads to inconsistency). var TokenSource = new CancellationTokenSource(); var token = TokenSource.Token; PerformanceCountercpuload= new PerformanceCounter( Processor  %ProcessorTime  _Total ); if (cpuload.NextValue()==100f) { TokenSource.Cancel(); }

Anurag Malani · Answer

Thanks Tapan . Ihave resolved this issueusing some other approachin TPLhowever I will use this solution as well to get themore understanding. :)