FCryMiner

CPU vs GPU Comparison

Educational Project: Compute-Shader-Mining, SHA256-Hashing

What is a Hash-Algorithm? Basically: generating Millions of Hashes per Second→ searching for valid ones → repeat.

Tutorial: How to create a GPU & CPU Miner in Unity

In this Blog-Article we will create a Comparison between CPU vs. GPU hashing.

1. Create CPU- Miner

void Update()
{
    float start = Time.realtimeSinceStartup;
    for (int i = 0; i < hashesPerFrame; i++)
    {
        string input = baseInput + Random.Range(0, int.MaxValue);
        string hash = Hash(input);
        if (hash.StartsWith(targetPrefix))
        {
            Debug.Log("Valid Hash Found (CPU): " + hash);
        }
    }
    float end = Time.realtimeSinceStartup;
    currentHashrate = hashesPerFrame / (end - start);
}

string Hash(string input)
{
    var bytes = Encoding.UTF8.GetBytes(input);
    using var sha256 = SHA256.Create();
    var hash = sha256.ComputeHash(bytes);
    return System.BitConverter.ToString(hash).Replace("-", "").ToLower();
}

2. Create GPU- Miner

void Start()
{
    resultBuffer = new ComputeBuffer(64, sizeof(uint));
}

void Update()
{
    float start = Time.realtimeSinceStartup;

    int kernel = computeShader.FindKernel("CSMain");
    computeShader.SetBuffer(kernel, "results", resultBuffer);
    computeShader.Dispatch(kernel, 1, 1, 1);

    resultBuffer.GetData(results);

    float end = Time.realtimeSinceStartup;
    currentHashrate = results.Length / (end - start);

}

void OnDestroy()
{
    resultBuffer.Release();
}

3. Create Shader

#pragma kernel CSMain

RWStructuredBuffer<uint> results;

[numthreads(64, 1, 1)]
void CSMain (uint3 id : SV_DispatchThreadID)
{
    uint value = id.x + 12345;
    value = (value ^ 0xABCDEF01) * 2654435761;
    results[id.x] = value;
}