62 lines
1.5 KiB
C#
62 lines
1.5 KiB
C#
namespace PerfectNumbers.Core.Gpu;
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public static class GpuPrimeWorkLimiter
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{
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private static SemaphoreSlim _semaphore = new(1, int.MaxValue);
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private static readonly object _lock = new();
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private static int _currentLimit = 1;
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public static IDisposable Acquire()
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{
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// TODO: Inline the pooled limiter guard from the GpuLimiterThroughputBenchmarks so prime-sieve
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// GPU jobs stop allocating Releaser instances on every acquisition.
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var sem = _semaphore;
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sem.Wait();
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return new Releaser(sem);
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}
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public static void SetLimit(int value)
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{
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if (value < 1)
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{
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value = 1;
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}
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lock (_lock)
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{
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if (value == _currentLimit)
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{
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return;
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}
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// TODO: Switch to a shared limiter implementation with GpuWorkLimiter so we can coordinate CPU/GPU prime work using
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// the same semaphore pool without reallocating per adjustment.
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_semaphore = new SemaphoreSlim(value, value);
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_currentLimit = value;
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}
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}
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private sealed class Releaser : IDisposable
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{
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private readonly SemaphoreSlim _sem;
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private bool _disposed;
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public Releaser(SemaphoreSlim sem)
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{
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_sem = sem;
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}
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public void Dispose()
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{
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if (_disposed)
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{
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return;
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}
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_sem.Release();
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_disposed = true;
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}
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}
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}
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