alexyakunin

using System;

namespace CSharpRecursion
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Counted to {0}.", CountRecursively(10000));
        }

alexyakunin

using System;
using System.Threading;
using System.Threading.Tasks;

namespace CSharpAsyncRecursion
{
    class Program
    {
        static void Main(string[] args)
        {

alexyakunin

using System;
using System.Threading;
using System.Threading.Tasks;

namespace CSharpAsyncRecursion
{
    class Program
    {
        static void Main(string[] args)
        {

alexyakunin

open System.Threading

let rec countRecursivelyAsync count = async {
    if count <= 0 then
        return count
    else
        let! result = countRecursivelyAsync(count - 1)
        return result + 1
}

alexyakunin

auto computeSum(char* fileName) {
    auto fIn = open(fileName, O_RDONLY | O_BINARY, 0644);

    static constexpr size_t BUFFER_SIZE = 1 << 16;
    uint8_t buffer[BUFFER_SIZE];
    uint8_t const* pBuffer = nullptr;
    size_t bufferPos = 0;
    size_t bufferLen = 0;

    int64_t sum = 0;

alexyakunin

public static long ComputeSum(string fileName, 
    Func<ReadOnlyMemory<byte>, long, int, (long, int)> sumComputer)
{
    using var fs = new FileStream(fileName, FileMode.Open);
    using var lease = MemoryPool<byte>.Shared.Rent(MinBufferSize);
    var buffer = lease.Memory;

    long sum = 0;
    int n = 0;
    while (true) {

alexyakunin

public static async Task<long> ComputeSumAsync(string fileName, 
    Func<ReadOnlyMemory<byte>, long, int, (long, int)> sumComputer, 
    CancellationToken ct = default)
{
    await using var fs = new FileStream(fileName, FileMode.Open);
    var pipe = new Pipe(new PipeOptions(
        minimumSegmentSize: MinBufferSize, 
        useSynchronizationContext: false));

    async Task ProduceAsync() {

alexyakunin

private static unsafe (long, int) ComputeSumSimd(
    ReadOnlyMemory<byte> buffer, long sum, int n)
{
    var span = buffer.Span;
    fixed (byte* pStart = span) {
        return ComputeSumSimd(new IntPtr(pStart), span.Length, sum, n);
    }
}

private static unsafe (long, int) ComputeSumSimd(

alexyakunin

public static long ComputeSumMMF(string fileName, 
    Func<IntPtr, long, long, int, (long, int)> sumComputer)
{
    using var f = MemoryMappedFile.CreateFromFile(fileName, FileMode.Open);
    using var fAccessor = f.CreateViewAccessor();
    var fHandle = fAccessor.SafeMemoryMappedViewHandle;
    var (sum, _) = sumComputer(fHandle.DangerousGetHandle(), (long) fHandle.ByteLength, 0, 0);
    return sum;
}

alexyakunin

@rem Copy this text to BeatSaberLauncher.bat & use it to start Beat Saber
@start "Beat Saber Launcher" powershell.exe -File BeatSaberLauncher.ps1