How can you measure the time it takes to read or write a large file?

Question

Utpal Vishwas · Answer

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) andgt; 0) { }
        }
        stopwatch.Stop();
        Console.WriteLine($"Read completed in {stopwatch.Elapsed.TotalSeconds} seconds.");
    }
}
Measure File Write Time
using System;
using System.Diagnostics;
using System.IO;
public class FileWriteTimer
{
    public static void MeasureWriteTime(string filePath, long sizeInMB)
    {
        Stopwatch stopwatch = Stopwatch.StartNew();
        byte[] buffer = new byte[1024 * 1024]; // 1 MB buffer
        new Random().NextBytes(buffer); // fill with random data
        using (FileStream fs = new FileStream(filePath, FileMode.Create, FileAccess.Write))
        {
            for (int i = 0; i andlt; sizeInMB; i++)
            {
                fs.Write(buffer, 0, buffer.Length);
            }
        }
        stopwatch.Stop();
        Console.WriteLine($"Write completed in {stopwatch.Elapsed.TotalSeconds} seconds.");
    }
}
Notes
Use larger buffers (e.g., 1 MB) for better performance on large files.For I/O-heavy benchmarks, ensure the disk cache and other system factors are considered.Always dispose streams properly or use using blocks.

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How can you measure the time it takes to read or write a large file?

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Measure File Read Time

Measure File Write Time

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