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Home Forums How can you measure the time it takes to read or write a large file? – MindStick
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1 Answers

Utpal Vishwas
Utpal Vishwas 28 May 2025
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You can measure the time it takes to read or write a large file in C# using the Stopwatch class from System.Diagnostics. Here's how to do it for both read and write operations:

Measure File Read Time

using System;
using System.Diagnostics;
using System.IO;

public class FileReadTimer
{
    public static void MeasureReadTime(string filePath)
    {
        Stopwatch stopwatch = Stopwatch.StartNew();

        using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read))
        {
            byte[] buffer = new byte[1024 * 1024]; // 1 MB buffer
            while (fs.Read(buffer, 0, buffer.Length) > 0) { }
        }

        stopwatch.Stop();
        Console.WriteLine($"Read completed in {stopwatch.Elapsed.TotalSeconds} seconds.");
    }
}

Measure File Write Time

using System;
using System.Diagnostics;
using System.IO;

public class FileWriteTimer
{
    public static void MeasureWriteTime(string filePath, long sizeInMB)
    {
        Stopwatch stopwatch = Stopwatch.StartNew();

        byte[] buffer = new byte[1024 * 1024]; // 1 MB buffer
        new Random().NextBytes(buffer); // fill with random data

        using (FileStream fs = new FileStream(filePath, FileMode.Create, FileAccess.Write))
        {
            for (int i = 0; i < sizeInMB; i++)
            {
                fs.Write(buffer, 0, buffer.Length);
            }
        }

        stopwatch.Stop();
        Console.WriteLine($"Write completed in {stopwatch.Elapsed.TotalSeconds} seconds.");
    }
}

Notes

  1. Use larger buffers (e.g., 1 MB) for better performance on large files.
  2. For I/O-heavy benchmarks, ensure the disk cache and other system factors are considered.
  3. Always dispose streams properly or use using blocks.
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