Breaking change partially reverted
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Marek Lemańczyk committed
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23e8d306b1
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-67
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@@ -15,39 +15,40 @@ public class MersenneNumberResidueGpuTester(bool useGpuOrder)
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public void Scan(ulong exponent, UInt128 twoP, bool lastIsSeven, UInt128 maxK, ref bool isPrime)
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{
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var gpuLease = GpuKernelPool.GetKernel(_useGpuOrder);
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var accelerator = gpuLease.Accelerator;
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// Ensure device has small cycles and primes tables for in-kernel lookup
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var smallCyclesView = GpuKernelPool.EnsureSmallCyclesOnDevice(accelerator);
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ResiduePrimeViews primeViews = GpuKernelPool.EnsureSmallPrimesOnDevice(accelerator);
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int batchSize = GpuConstants.ScanBatchSize;
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UInt128 kStart = 1UL;
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byte last = lastIsSeven ? (byte)1 : (byte)0;
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var kernel = gpuLease.Pow2ModKernel;
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ulong step10 = ((exponent % 10UL) << 1) % 10UL;
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ulong step8 = ((exponent & 7UL) << 1) & 7UL;
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ulong step3 = ((exponent % 3UL) << 1) % 3UL;
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ulong step5 = ((exponent % 5UL) << 1) % 5UL;
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GpuUInt128 twoPGpu = (GpuUInt128)twoP;
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var accelerator = gpuLease.Accelerator;
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var stream = gpuLease.Stream;
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// Ensure device has small cycles and primes tables for in-kernel lookup
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var smallCyclesView = GpuKernelPool.EnsureSmallCyclesOnDevice(accelerator);
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ResiduePrimeViews primeViews = GpuKernelPool.EnsureSmallPrimesOnDevice(accelerator);
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int batchSize = GpuConstants.ScanBatchSize;
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UInt128 kStart = 1UL;
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byte last = lastIsSeven ? (byte)1 : (byte)0;
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var kernel = gpuLease.Pow2ModKernel;
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ulong step10 = ((exponent % 10UL) << 1) % 10UL;
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ulong step8 = ((exponent & 7UL) << 1) & 7UL;
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ulong step3 = ((exponent % 3UL) << 1) % 3UL;
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ulong step5 = ((exponent % 5UL) << 1) % 5UL;
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GpuUInt128 twoPGpu = (GpuUInt128)twoP;
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var orderBuffer = accelerator.Allocate1D<ulong>(batchSize);
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// Device memory returned by Allocate1D is not guaranteed to be zeroed.
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// Ensure the buffer starts with a known state so that lanes skipped by the
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// kernel (for example due to early rejections) do not leave stale garbage
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// values that would be interpreted as composite witnesses when copied back
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// to the host. This mirrors the explicit zeroing performed by other GPU
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// testers such as the order kernels.
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orderBuffer.MemSetToZero();
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ulong[] orderArray = ArrayPool<ulong>.Shared.Rent(batchSize);
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UInt128 remaining;
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int currentSize;
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int i;
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UInt128 batchSize128 = (UInt128)batchSize, q;
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Span<ulong> orders = orderArray.AsSpan(0, batchSize);
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try
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{
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while (kStart < maxK && Volatile.Read(ref isPrime))
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{
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remaining = maxK - kStart;
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var orderBuffer = accelerator.Allocate1D<ulong>(batchSize);
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// Device memory returned by Allocate1D is not guaranteed to be zeroed.
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// Ensure the buffer starts with a known state so that lanes skipped by the
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// kernel (for example due to early rejections) do not leave stale garbage
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// values that would be interpreted as composite witnesses when copied back
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// to the host. This mirrors the explicit zeroing performed by other GPU
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// testers such as the order kernels.
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orderBuffer.MemSetToZero();
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ulong[] orderArray = ArrayPool<ulong>.Shared.Rent(batchSize);
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UInt128 remaining;
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int currentSize;
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int i;
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UInt128 batchSize128 = (UInt128)batchSize, q;
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Span<ulong> orders = orderArray.AsSpan(0, batchSize);
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try
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{
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while (kStart < maxK && Volatile.Read(ref isPrime))
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{
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remaining = maxK - kStart;
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if (remaining > batchSize128)
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{
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currentSize = batchSize;
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@@ -58,35 +59,36 @@ public class MersenneNumberResidueGpuTester(bool useGpuOrder)
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orders = orderArray.AsSpan(0, currentSize);
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}
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q = twoP * kStart + UInt128.One;
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q.Mod10_8_5_3(out ulong q0m10, out ulong q0m8, out ulong q0m5, out ulong q0m3);
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var ra = new ResidueAutomatonArgs(q0m10, step10, q0m8, step8, q0m3, step3, q0m5, step5);
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q = twoP * kStart + UInt128.One;
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q.Mod10_8_5_3(out ulong q0m10, out ulong q0m8, out ulong q0m5, out ulong q0m3);
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var ra = new ResidueAutomatonArgs(q0m10, step10, q0m8, step8, q0m3, step3, q0m5, step5);
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kernel(currentSize, exponent, twoPGpu, (GpuUInt128)kStart, last, 0UL,
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ra, orderBuffer.View, smallCyclesView, primeViews.LastOne, primeViews.LastSeven, primeViews.LastOnePow2, primeViews.LastSevenPow2);
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kernel(stream, currentSize, exponent, twoPGpu, (GpuUInt128)kStart, last, 0UL,
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ra, orderBuffer.View, smallCyclesView, primeViews.LastOne, primeViews.LastSeven, primeViews.LastOnePow2, primeViews.LastSevenPow2); // kernel(currentSize, exponent, twoPGpu, (GpuUInt128)kStart, last, 0UL,
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// ra, orderBuffer.View, smallCyclesView, primeViews.LastOne, primeViews.LastSeven, primeViews.LastOnePow2, primeViews.LastSevenPow2);
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accelerator.Synchronize();
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orderBuffer.View.CopyToCPU(ref MemoryMarshal.GetReference(orders), currentSize);
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if (!Volatile.Read(ref isPrime))
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{
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break;
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}
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accelerator.Synchronize();
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orderBuffer.View.CopyToCPU(ref MemoryMarshal.GetReference(orders), currentSize);
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if (!Volatile.Read(ref isPrime))
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{
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break;
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}
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for (i = 0; i < currentSize; i++)
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{
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if (orders[i] != 0UL)
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{
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Volatile.Write(ref isPrime, false);
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break;
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}
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}
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for (i = 0; i < currentSize; i++)
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{
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if (orders[i] != 0UL)
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{
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Volatile.Write(ref isPrime, false);
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break;
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}
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}
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kStart += batchSize128;
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}
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}
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finally
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{
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ArrayPool<ulong>.Shared.Return(orderArray);
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kStart += batchSize128;
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}
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}
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finally
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{
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ArrayPool<ulong>.Shared.Return(orderArray);
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orderBuffer.Dispose();
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gpuLease.Dispose();
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}
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@@ -16,6 +16,7 @@ public enum GpuKernelType
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}
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public sealed class MersenneNumberTester(
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UInt128 maxK,
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bool useIncremental = true,
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bool useOrderCache = false,
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GpuKernelType kernelType = GpuKernelType.Incremental,
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@@ -24,12 +25,11 @@ public sealed class MersenneNumberTester(
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bool useGpuLucas = true,
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bool useGpuScan = true,
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bool useGpuOrder = true,
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bool useResidue = true,
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ulong maxK = 5_000_000UL)
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bool useResidue = true)
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{
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private readonly bool _useResidue = useResidue;
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private readonly bool _useIncremental = useIncremental && !useResidue;
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private readonly ulong _maxK = maxK;
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private readonly UInt128 _maxK = maxK;
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private readonly GpuKernelType _kernelType = kernelType;
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private readonly bool _useModuloWorkaround = useModuloWorkaround;
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private readonly bool _useGpuLucas = useGpuLucas;
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@@ -228,11 +228,6 @@ public sealed class MersenneNumberTester(
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// In residue mode the residue scan is the final primality check.
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if (_useResidue)
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{
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if ((UInt128)_maxK < maxK)
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{
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maxK = _maxK;
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}
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if (_useGpuScan)
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{
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_residueGpuTester!.Scan(exponent, twoP, lastIsSeven, maxK, ref prePrime);
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