How Can I Control the Number of Threads in a Parallel.ForEach Loop?

Optimizing Parallel Processing with Parallel.ForEach()

Efficiently managing concurrent tasks in Parallel.ForEach() is essential, particularly when dealing with resource constraints. This article explains how to control the number of threads used within a Parallel.ForEach() loop.

Controlling Concurrency

The ParallelOptions class provides the mechanism to limit the level of parallelism in Parallel.ForEach(). The key property is MaxDegreeOfParallelism. By setting this value, you specify the maximum number of threads that will execute concurrently.

Illustrative Example:

<code class="language-csharp">Parallel.ForEach(
    listOfWebpages,
    new ParallelOptions { MaxDegreeOfParallelism = 4 },
    webpage => { Download(webpage); }
);</code>

This code snippet limits the concurrent downloads to a maximum of four threads. This is beneficial for managing resource consumption and preventing system overload.

Further Reading

For a deeper understanding, consult the following resources:

• Parallel.ForEach Documentation
• ParallelOptions.MaxDegreeOfParallelism Documentation

Implementing these techniques ensures optimal resource utilization and prevents excessive thread creation within your Parallel.ForEach() loops.

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