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ThreadPool.GetMinThreads Method

Retrieves the minimum number of threads the thread pool creates on demand, as new requests are made, before switching to an algorithm for managing thread creation and destruction.

Namespace:  System.Threading
Assembly:  mscorlib (in mscorlib.dll)

public static void GetMinThreads(
	out int workerThreads,
	out int completionPortThreads
)

Parameters

workerThreads
Type: System.Int32

When this method returns, contains the minimum number of worker threads that the thread pool creates on demand.

completionPortThreads
Type: System.Int32

When this method returns, contains the minimum number of asynchronous I/O threads that the thread pool creates on demand.

The thread pool provides new worker threads or I/O completion threads on demand until it reaches the minimum for each category. By default, the minimum number of threads is set to the number of processors on a system. When the minimum is reached, the thread pool can create additional threads in that category or wait until some tasks complete. Beginning with the .NET Framework 4, the thread pool creates and destroys threads in order to optimize throughput, which is defined as the number of tasks that complete per unit of time. Too few threads might not make optimal use of available resources, whereas too many threads could increase resource contention.

NoteNote

When demand is low, the actual number of thread pool threads can fall below the minimum values.

The following example sets the minimum number of worker threads to four, and preserves the original value for the minimum number of asynchronous I/O completion threads.

using System;
using System.Threading;

public class Test
{
    public static void Main()
    {
        int minWorker, minIOC;
        // Get the current settings.
        ThreadPool.GetMinThreads(out minWorker, out minIOC);
        // Change the minimum number of worker threads to four, but 
        // keep the old setting for minimum asynchronous I/O  
        // completion threads. 
        if (ThreadPool.SetMinThreads(4, minIOC))
        {
            // The minimum number of threads was set successfully.
        }
        else
        {
            // The minimum number of threads was not changed.
        }
    }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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