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Efficiently Listing Files in a Directory with Exceedingly High File Counts

Directories with vast amounts of files pose challenges in efficiently listing their contents. While functions like ioutil.ReadDir and filepath.Glob provide simplified methods, their limitations become evident when working with directories containing billions of files.

To overcome these limitations, it's crucial to avoid relying solely on these functions. Instead, focus on employing the underlying Readdir or Readdirnames methods, which allow for batch processing of directory entries. By specifying a positive value for the n argument, you can leverage these methods to retrieve files in manageable batches.

The source code snippet provided in the query highlights the implementation of Readdirnames, which serves as the core function for reading directory entries. By harnessing this function directly, you gain greater control over the batch size and iteration process, enabling efficient handling of large directories.

It's important to note that introducing goroutines and channels for such a simple operation as reading directory entries unnecessarily introduces overhead. The direct approach with batching using Readdir or Readdirnames provides a straightforward and efficient solution, leaving the option to implement your own goroutine and channel pattern if desired.

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