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Marek Lemańczyk committed 2025-10-28 02:01:28 +01:00
1 parent bd0727131f
commit 6dd5cea79f
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PerfectNumbers.Core/PrimeOrderCalculator.Gpu.cs
+50 -71
View File
@@ -9,86 +9,65 @@ namespace PerfectNumbers.Core;
internal static partial class PrimeOrderCalculator
{
private static bool IsGpuPow2Allowed => s_pow2ModeInitialized && s_allowGpuPow2;
private static bool IsGpuPow2Allowed => s_pow2ModeInitialized && s_allowGpuPow2;
private const int GpuSmallPrimeFactorSlots = 64;
private const int GpuSmallPrimeFactorSlots = 64;
private static bool TryPopulateSmallPrimeFactorsGpu(ulong value, uint limit, Dictionary<ulong, int> counts, out int factorCount, out ulong remaining)
{
var primeBufferArray = ThreadStaticPools.UlongPool.Rent(GpuSmallPrimeFactorSlots);
var exponentBufferArray = ThreadStaticPools.IntPool.Rent(GpuSmallPrimeFactorSlots);
Span<ulong> primeBuffer = primeBufferArray.AsSpan(0, GpuSmallPrimeFactorSlots);
Span<int> exponentBuffer = exponentBufferArray.AsSpan(0, GpuSmallPrimeFactorSlots);
// primeBuffer.Clear();
// exponentBuffer.Clear();
remaining = value;
private static bool TryPopulateSmallPrimeFactorsGpu(ulong value, uint limit, Dictionary<ulong, int> counts, out int factorCount, out ulong remaining)
{
var primeBufferArray = ThreadStaticPools.UlongPool.Rent(GpuSmallPrimeFactorSlots);
var exponentBufferArray = ThreadStaticPools.IntPool.Rent(GpuSmallPrimeFactorSlots);
Span<ulong> primeBuffer = primeBufferArray.AsSpan(0, GpuSmallPrimeFactorSlots);
Span<int> exponentBuffer = exponentBufferArray.AsSpan(0, GpuSmallPrimeFactorSlots);
remaining = value;
try
{
var lease = GpuKernelPool.GetKernel(useGpuOrder: true);
var execution = lease.EnterExecutionScope();
try
{
Accelerator accelerator = lease.Accelerator;
AcceleratorStream stream = lease.Stream;
var lease = GpuKernelPool.GetKernel(useGpuOrder: true);
var execution = lease.EnterExecutionScope();
Accelerator accelerator = lease.Accelerator;
AcceleratorStream stream = lease.Stream;
SmallPrimeFactorTables tables = GpuKernelPool.EnsureSmallPrimeFactorTables(accelerator);
SmallPrimeFactorScratch scratch = GpuKernelPool.EnsureSmallPrimeFactorScratch(accelerator, GpuSmallPrimeFactorSlots);
// scratch.Clear();
SmallPrimeFactorTables tables = GpuKernelPool.EnsureSmallPrimeFactorTables(accelerator);
SmallPrimeFactorScratch scratch = GpuKernelPool.EnsureSmallPrimeFactorScratch(accelerator, GpuSmallPrimeFactorSlots);
var kernel = lease.SmallPrimeFactorKernel;
kernel(
stream,
1,
value,
limit,
tables.PrimesView,
tables.SquaresView,
tables.Count,
scratch.PrimeSlots.View,
scratch.ExponentSlots.View,
scratch.CountSlot.View,
scratch.RemainingSlot.View);
var kernel = lease.SmallPrimeFactorKernel;
kernel(
stream,
1,
value,
limit,
tables.PrimesView,
tables.SquaresView,
tables.Count,
scratch.PrimeSlots.View,
scratch.ExponentSlots.View,
scratch.CountSlot.View,
scratch.RemainingSlot.View);
stream.Synchronize();
stream.Synchronize();
factorCount = 0;
scratch.CountSlot.View.CopyToCPU(ref factorCount, 1);
factorCount = Math.Min(factorCount, GpuSmallPrimeFactorSlots);
factorCount = 0;
scratch.CountSlot.View.CopyToCPU(ref factorCount, 1);
factorCount = Math.Min(factorCount, GpuSmallPrimeFactorSlots);
if (factorCount > 0)
{
scratch.PrimeSlots.View.CopyToCPU(ref MemoryMarshal.GetReference(primeBuffer), factorCount);
scratch.ExponentSlots.View.CopyToCPU(ref MemoryMarshal.GetReference(exponentBuffer), factorCount);
}
if (factorCount > 0)
{
scratch.PrimeSlots.View.CopyToCPU(ref MemoryMarshal.GetReference(primeBuffer), factorCount);
scratch.ExponentSlots.View.CopyToCPU(ref MemoryMarshal.GetReference(exponentBuffer), factorCount);
}
scratch.RemainingSlot.View.CopyToCPU(ref remaining, 1);
scratch.RemainingSlot.View.CopyToCPU(ref remaining, 1);
for (int i = 0; i < factorCount; i++)
{
ulong primeValue = primeBuffer[i];
int exponent = exponentBuffer[i];
// This will never happen in production code
// if (primeValue == 0UL || exponent == 0)
// {
// continue;
// }
for (int i = 0; i < factorCount; i++)
{
ulong primeValue = primeBuffer[i];
int exponent = exponentBuffer[i];
counts.Add(primeValue, exponent);
}
counts.Add(primeValue, exponent);
}
return true;
}
finally
{
execution.Dispose();
lease.Dispose();
}
}
finally
{
ThreadStaticPools.UlongPool.Return(primeBufferArray);
ThreadStaticPools.IntPool.Return(exponentBufferArray);
}
}
execution.Dispose();
lease.Dispose();
ThreadStaticPools.UlongPool.Return(primeBufferArray);
ThreadStaticPools.IntPool.Return(exponentBufferArray);
return true;
}
}