690 lines
26 KiB
C#
690 lines
26 KiB
C#
using System;
|
|
using System.Buffers;
|
|
using System.Collections.Concurrent;
|
|
using System.Runtime.CompilerServices;
|
|
using System.Runtime.InteropServices;
|
|
using System.Threading;
|
|
using PerfectNumbers.Core;
|
|
using ILGPU;
|
|
using ILGPU.Runtime;
|
|
|
|
namespace PerfectNumbers.Core.Gpu;
|
|
|
|
/// <summary>
|
|
/// Scans Mersenne divisors on the GPU for prime exponents p >= 31 using per-divisor Montgomery data.
|
|
/// Consumers must call <see cref="ConfigureFromMaxPrime"/> before invoking other members so the divisor limits are populated.
|
|
/// </summary>
|
|
public sealed class MersenneNumberDivisorByDivisorGpuTester : IMersenneNumberDivisorByDivisorTester
|
|
{
|
|
private int _gpuBatchSize = GpuConstants.ScanBatchSize;
|
|
// EvenPerfectBitScanner configures the GPU tester once before scanning and never mutates the configuration afterwards,
|
|
// so the synchronization fields from the previous implementation remain commented out here.
|
|
// private readonly object _sync = new();
|
|
private ulong _divisorLimit;
|
|
// private bool _isConfigured;
|
|
|
|
private readonly ConcurrentDictionary<Accelerator, Action<Index1D, ArrayView<MontgomeryDivisorData>, ArrayView<ulong>, ArrayView<byte>, ArrayView<int>>> _kernelCache = new();
|
|
private readonly ConcurrentDictionary<Accelerator, Action<Index1D, MontgomeryDivisorData, ulong, ulong, ArrayView<ulong>, ArrayView<byte>>> _stepperKernelCache = new(AcceleratorReferenceComparer.Instance);
|
|
private readonly ConcurrentDictionary<Accelerator, ConcurrentBag<BatchResources>> _resourcePools = new(AcceleratorReferenceComparer.Instance);
|
|
private readonly ConcurrentBag<GpuContextPool.GpuContextLease> _acceleratorPool = new();
|
|
private readonly ConcurrentBag<DivisorScanSession> _sessionPool = new();
|
|
|
|
private Action<Index1D, ArrayView<MontgomeryDivisorData>, ArrayView<ulong>, ArrayView<byte>, ArrayView<int>> GetKernel(Accelerator accelerator) =>
|
|
_kernelCache.GetOrAdd(accelerator, acc => acc.LoadAutoGroupedStreamKernel<Index1D, ArrayView<MontgomeryDivisorData>, ArrayView<ulong>, ArrayView<byte>, ArrayView<int>>(DivisorByDivisorKernels.CheckKernel));
|
|
|
|
private Action<Index1D, MontgomeryDivisorData, ulong, ulong, ArrayView<ulong>, ArrayView<byte>> GetStepperKernel(Accelerator accelerator) =>
|
|
_stepperKernelCache.GetOrAdd(accelerator, acc => acc.LoadAutoGroupedStreamKernel<Index1D, MontgomeryDivisorData, ulong, ulong, ArrayView<ulong>, ArrayView<byte>>(DivisorByDivisorKernels.EvaluateDivisorWithStepperKernel));
|
|
|
|
|
|
public int GpuBatchSize
|
|
{
|
|
get => _gpuBatchSize;
|
|
set => _gpuBatchSize = value < 1 ? 1 : value;
|
|
}
|
|
|
|
int IMersenneNumberDivisorByDivisorTester.BatchSize
|
|
{
|
|
get => GpuBatchSize;
|
|
set => GpuBatchSize = value;
|
|
}
|
|
|
|
public void ConfigureFromMaxPrime(ulong maxPrime)
|
|
{
|
|
// EvenPerfectBitScanner configures the GPU tester once before scanning and never mutates the configuration afterwards,
|
|
// so synchronization and runtime configuration guards are unnecessary here.
|
|
// lock (_sync)
|
|
// {
|
|
// _divisorLimit = ComputeDivisorLimitFromMaxPrimeGpu(maxPrime);
|
|
// _isConfigured = true;
|
|
// }
|
|
|
|
_divisorLimit = ComputeDivisorLimitFromMaxPrimeGpu(maxPrime);
|
|
// _isConfigured = true;
|
|
}
|
|
|
|
public bool IsPrime(ulong prime, out bool divisorsExhausted)
|
|
{
|
|
ulong allowedMax;
|
|
int batchCapacity;
|
|
|
|
// EvenPerfectBitScanner only calls into this tester after configuring it once, so we can read the cached values without locking.
|
|
// lock (_sync)
|
|
// {
|
|
// if (!_isConfigured)
|
|
// {
|
|
// throw new InvalidOperationException("ConfigureFromMaxPrime must be called before using the tester.");
|
|
// }
|
|
|
|
// allowedMax = ComputeAllowedMaxDivisorGpu(prime, _divisorLimit);
|
|
// batchCapacity = _gpuBatchSize;
|
|
// }
|
|
|
|
allowedMax = ComputeAllowedMaxDivisorGpu(prime, _divisorLimit);
|
|
batchCapacity = _gpuBatchSize;
|
|
|
|
// Production scans never shrink the divisor window below three, so this guard stays commented out.
|
|
// if (allowedMax < 3UL)
|
|
// {
|
|
// divisorsExhausted = true;
|
|
// return true;
|
|
// }
|
|
|
|
bool composite;
|
|
bool coveredRange;
|
|
ulong processedCount;
|
|
ulong lastProcessed;
|
|
|
|
var gpuLease = RentAccelerator();
|
|
var accelerator = gpuLease.Accelerator;
|
|
|
|
Monitor.Enter(gpuLease.ExecutionLock);
|
|
|
|
var kernel = GetKernel(accelerator);
|
|
var resources = RentBatchResources(accelerator, batchCapacity);
|
|
|
|
composite = CheckDivisors(
|
|
prime,
|
|
allowedMax,
|
|
kernel,
|
|
resources.DivisorsBuffer,
|
|
resources.ExponentBuffer,
|
|
resources.HitsBuffer,
|
|
resources.HitIndexBuffer,
|
|
resources.Divisors,
|
|
resources.Exponents,
|
|
resources.DivisorData,
|
|
out lastProcessed,
|
|
out coveredRange,
|
|
out processedCount);
|
|
|
|
ReturnBatchResources(accelerator, resources);
|
|
Monitor.Exit(gpuLease.ExecutionLock);
|
|
ReturnAccelerator(gpuLease);
|
|
|
|
if (composite)
|
|
{
|
|
divisorsExhausted = true;
|
|
return false;
|
|
}
|
|
|
|
divisorsExhausted = coveredRange;
|
|
return true;
|
|
}
|
|
|
|
public void PrepareCandidates(in ReadOnlySpan<ulong> primes, Span<ulong> allowedMaxValues)
|
|
{
|
|
// The scanner always supplies matching spans, so the previous validation remains commented out.
|
|
// if (allowedMaxValues.Length < primes.Length)
|
|
// {
|
|
// throw new ArgumentException("allowedMaxValues span must be at least as long as primes span.", nameof(allowedMaxValues));
|
|
// }
|
|
|
|
ulong divisorLimit;
|
|
|
|
// EvenPerfectBitScanner configures the tester exactly once before preparing candidates.
|
|
// lock (_sync)
|
|
// {
|
|
// if (!_isConfigured)
|
|
// {
|
|
// throw new InvalidOperationException("ConfigureFromMaxPrime must be called before using the tester.");
|
|
// }
|
|
|
|
// divisorLimit = _divisorLimit;
|
|
// }
|
|
|
|
divisorLimit = _divisorLimit;
|
|
|
|
for (int index = 0; index < primes.Length; index++)
|
|
{
|
|
allowedMaxValues[index] = ComputeAllowedMaxDivisorGpu(primes[index], divisorLimit);
|
|
}
|
|
}
|
|
|
|
private static bool CheckDivisors(
|
|
ulong prime,
|
|
ulong allowedMax,
|
|
Action<Index1D, ArrayView<MontgomeryDivisorData>, ArrayView<ulong>, ArrayView<byte>, ArrayView<int>> kernel,
|
|
MemoryBuffer1D<MontgomeryDivisorData, Stride1D.Dense> divisorsBuffer,
|
|
MemoryBuffer1D<ulong, Stride1D.Dense> exponentBuffer,
|
|
MemoryBuffer1D<byte, Stride1D.Dense> hitsBuffer,
|
|
MemoryBuffer1D<int, Stride1D.Dense> hitIndexBuffer,
|
|
in ulong[] divisors,
|
|
ulong[] exponents,
|
|
MontgomeryDivisorData[] divisorData,
|
|
out ulong lastProcessed,
|
|
out bool coveredRange,
|
|
out ulong processedCount)
|
|
{
|
|
int batchCapacity = (int)divisorsBuffer.Length;
|
|
bool composite = false;
|
|
bool processedAll = false;
|
|
processedCount = 0UL;
|
|
lastProcessed = 0UL;
|
|
|
|
int chunkCapacity = Math.Max(1, batchCapacity);
|
|
|
|
UInt128 twoP128 = (UInt128)prime << 1;
|
|
UInt128 allowedMax128 = allowedMax;
|
|
UInt128 firstDivisor128 = twoP128 + UInt128.One;
|
|
bool invalidStride = twoP128 == UInt128.Zero;
|
|
bool outOfRange = firstDivisor128 > allowedMax128;
|
|
UInt128 numerator = allowedMax128 - UInt128.One;
|
|
UInt128 maxK128 = invalidStride || outOfRange ? UInt128.Zero : numerator / twoP128;
|
|
bool hasCandidates = !invalidStride && !outOfRange && maxK128 != UInt128.Zero;
|
|
if (!hasCandidates)
|
|
{
|
|
coveredRange = true;
|
|
return false;
|
|
}
|
|
|
|
ulong maxK = maxK128 > ulong.MaxValue ? ulong.MaxValue : (ulong)maxK128;
|
|
ulong currentK = 1UL;
|
|
|
|
UInt128 currentDivisor128 = firstDivisor128;
|
|
bool lastIsSeven = (prime & 3UL) == 3UL;
|
|
ArrayPool<ulong> ulongPool = ThreadStaticPools.UlongPool;
|
|
ulong[] filteredDivisors = ulongPool.Rent(chunkCapacity);
|
|
Span<ulong> filteredStorage = filteredDivisors.AsSpan();
|
|
Span<MontgomeryDivisorData> divisorDataStorage = divisorData.AsSpan();
|
|
Span<ulong> divisorStorage = divisors.AsSpan();
|
|
Span<ulong> exponentStorage = exponents.AsSpan();
|
|
|
|
while (currentK <= maxK && !composite)
|
|
{
|
|
int chunkCount = Math.Min(chunkCapacity, batchCapacity);
|
|
ulong remainingK = maxK - currentK + 1UL;
|
|
if ((ulong)chunkCount > remainingK)
|
|
{
|
|
chunkCount = (int)remainingK;
|
|
}
|
|
|
|
if (chunkCount <= 0)
|
|
{
|
|
processedAll = true;
|
|
break;
|
|
}
|
|
|
|
int filteredCount = 0;
|
|
UInt128 nextDivisor128 = currentDivisor128;
|
|
|
|
for (int i = 0; i < chunkCount; i++)
|
|
{
|
|
ulong candidate = (ulong)nextDivisor128;
|
|
nextDivisor128 += twoP128;
|
|
|
|
if (CandidatePassesHeuristics(candidate, lastIsSeven))
|
|
{
|
|
filteredStorage[filteredCount++] = candidate;
|
|
}
|
|
}
|
|
|
|
processedCount += (ulong)chunkCount;
|
|
|
|
UInt128 lastDivisor128 = nextDivisor128 - twoP128;
|
|
lastProcessed = (ulong)lastDivisor128;
|
|
currentDivisor128 = nextDivisor128;
|
|
|
|
currentK += (ulong)chunkCount;
|
|
processedAll = currentK > maxK;
|
|
|
|
if (filteredCount == 0)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
Span<ulong> filteredDivisorsSpan = filteredStorage[..filteredCount];
|
|
|
|
Span<MontgomeryDivisorData> divisorDataSpan = divisorDataStorage;
|
|
Span<ulong> divisorSpan = divisorStorage;
|
|
Span<ulong> exponentSpan = exponentStorage;
|
|
|
|
int admissibleCount = 0;
|
|
for (int i = 0; i < filteredCount; i++)
|
|
{
|
|
ulong divisorValue = filteredDivisorsSpan[i];
|
|
MontgomeryDivisorData divisorDataValue = MontgomeryDivisorData.FromModulus(divisorValue);
|
|
ulong divisorCycle = ResolveDivisorCycle(divisorValue, prime, divisorDataValue);
|
|
if (divisorCycle != prime)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
divisorSpan[admissibleCount] = divisorValue;
|
|
exponentSpan[admissibleCount] = prime;
|
|
divisorDataSpan[admissibleCount] = divisorDataValue;
|
|
admissibleCount++;
|
|
}
|
|
|
|
if (admissibleCount == 0)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
Span<ulong> activeDivisors = divisorSpan[..admissibleCount];
|
|
Span<MontgomeryDivisorData> activeDivisorData = divisorDataSpan[..admissibleCount];
|
|
Span<ulong> activeExponents = exponentSpan[..admissibleCount];
|
|
ArrayView1D<MontgomeryDivisorData, Stride1D.Dense> divisorView = divisorsBuffer.View.SubView(0, admissibleCount);
|
|
ArrayView1D<ulong, Stride1D.Dense> exponentView = exponentBuffer.View.SubView(0, admissibleCount);
|
|
ArrayView1D<byte, Stride1D.Dense> hitsView = hitsBuffer.View.SubView(0, admissibleCount);
|
|
ArrayView1D<int, Stride1D.Dense> hitIndexView = hitIndexBuffer.View.SubView(0, 1);
|
|
|
|
divisorView.CopyFromCPU(ref MemoryMarshal.GetReference(activeDivisorData), admissibleCount);
|
|
exponentView.CopyFromCPU(ref MemoryMarshal.GetReference(activeExponents), admissibleCount);
|
|
int sentinel = int.MaxValue;
|
|
hitIndexView.SubView(0, 1).CopyFromCPU(ref sentinel, 1);
|
|
|
|
kernel(admissibleCount, divisorView, exponentView, hitsView, hitIndexView);
|
|
|
|
int firstHit = sentinel;
|
|
hitIndexView.SubView(0, 1).CopyToCPU(ref firstHit, 1);
|
|
int hitIndex = firstHit >= admissibleCount ? -1 : firstHit;
|
|
bool hitFound = hitIndex >= 0;
|
|
composite = hitFound;
|
|
int lastIndex = admissibleCount - 1;
|
|
lastProcessed = hitFound ? activeDivisors[hitIndex] : activeDivisors[lastIndex];
|
|
}
|
|
|
|
ulongPool.Return(filteredDivisors, clearArray: false);
|
|
|
|
coveredRange = composite || processedAll || (currentDivisor128 > allowedMax128);
|
|
return composite;
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private static ulong ResolveDivisorCycle(ulong divisor, ulong prime, in MontgomeryDivisorData divisorData)
|
|
{
|
|
if (!MersenneDivisorCycles.TryCalculateCycleLengthForExponent(divisor, prime, divisorData, out ulong computedCycle, out bool primeOrderFailed) || computedCycle == 0UL)
|
|
{
|
|
return MersenneDivisorCycles.CalculateCycleLength(divisor, divisorData, skipPrimeOrderHeuristic: primeOrderFailed);
|
|
}
|
|
|
|
return computedCycle;
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private static bool CandidatePassesHeuristics(ulong candidate, bool lastIsSeven)
|
|
{
|
|
// Mirror the CPU heuristics so the GPU path rejects obvious composites before computing cycles.
|
|
ulong remainder10 = candidate % 10UL;
|
|
bool accept10 = lastIsSeven
|
|
? (remainder10 == 3UL || remainder10 == 7UL || remainder10 == 9UL)
|
|
: (remainder10 == 1UL || remainder10 == 3UL || remainder10 == 9UL);
|
|
if (!accept10)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
ulong remainder8 = candidate & 7UL;
|
|
if (remainder8 != 1UL && remainder8 != 7UL)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (candidate % 3UL == 0UL || candidate % 5UL == 0UL || candidate % 7UL == 0UL || candidate % 11UL == 0UL)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
private static ulong ComputeDivisorLimitFromMaxPrimeGpu(ulong maxPrime)
|
|
{
|
|
// The --mersenne=bydivisor flow in EvenPerfectBitScanner only calls ConfigureFromMaxPrime with primes greater than 1,
|
|
// so the guard below never trips in production runs.
|
|
// if (maxPrime <= 1UL)
|
|
// {
|
|
// return 0UL;
|
|
// }
|
|
if (maxPrime - 1UL >= 64UL)
|
|
{
|
|
return ulong.MaxValue;
|
|
}
|
|
|
|
return (1UL << (int)(maxPrime - 1UL)) - 1UL;
|
|
}
|
|
|
|
private static ulong ComputeAllowedMaxDivisorGpu(ulong prime, ulong divisorLimit)
|
|
{
|
|
// Production --mersenne=bydivisor runs only pass prime exponents, so the guard below never executes outside tests.
|
|
// if (prime <= 1UL)
|
|
// {
|
|
// return 0UL;
|
|
// }
|
|
if (prime - 1UL >= 64UL)
|
|
{
|
|
return divisorLimit;
|
|
}
|
|
|
|
ulong computedLimit = (1UL << (int)(prime - 1UL)) - 1UL;
|
|
return computedLimit < divisorLimit ? computedLimit : divisorLimit;
|
|
}
|
|
|
|
public sealed class DivisorScanSession : IMersenneNumberDivisorByDivisorTester.IDivisorScanSession
|
|
{
|
|
private readonly MersenneNumberDivisorByDivisorGpuTester _owner;
|
|
private readonly GpuContextPool.GpuContextLease _lease;
|
|
private readonly Accelerator _accelerator;
|
|
private Action<Index1D, MontgomeryDivisorData, ulong, ulong, ArrayView<ulong>, ArrayView<byte>> _stepperKernel = null!;
|
|
private MemoryBuffer1D<ulong, Stride1D.Dense> _exponentsBuffer = null!;
|
|
private MemoryBuffer1D<byte, Stride1D.Dense> _hitBuffer = null!;
|
|
private ulong[] _hostBuffer = null!;
|
|
private int _capacity;
|
|
private bool _disposed;
|
|
|
|
internal DivisorScanSession(MersenneNumberDivisorByDivisorGpuTester owner)
|
|
{
|
|
_owner = owner;
|
|
_lease = GpuContextPool.RentPreferred(preferCpu: false);
|
|
_accelerator = _lease.Accelerator;
|
|
_capacity = Math.Max(1, owner._gpuBatchSize);
|
|
}
|
|
|
|
internal void Reset()
|
|
{
|
|
_disposed = false;
|
|
}
|
|
|
|
private void EnsureExecutionResourcesLocked(int requiredCapacity)
|
|
{
|
|
if (_stepperKernel == null)
|
|
{
|
|
_stepperKernel = _owner.GetStepperKernel(_accelerator);
|
|
}
|
|
|
|
bool allocateBuffers = _exponentsBuffer == null;
|
|
if (!allocateBuffers && _capacity < requiredCapacity)
|
|
{
|
|
_exponentsBuffer?.Dispose();
|
|
_hitBuffer?.Dispose();
|
|
if (_hostBuffer != null)
|
|
{
|
|
ThreadStaticPools.UlongPool.Return(_hostBuffer, clearArray: false);
|
|
_hostBuffer = null!;
|
|
}
|
|
|
|
_exponentsBuffer = null!;
|
|
_hitBuffer = null!;
|
|
allocateBuffers = true;
|
|
}
|
|
|
|
if (allocateBuffers)
|
|
{
|
|
int desiredCapacity = requiredCapacity > _capacity ? requiredCapacity : _capacity;
|
|
_capacity = desiredCapacity;
|
|
_exponentsBuffer = _accelerator.Allocate1D<ulong>(_capacity);
|
|
_hitBuffer = _accelerator.Allocate1D<byte>(_capacity);
|
|
_hostBuffer = ThreadStaticPools.UlongPool.Rent(_capacity);
|
|
}
|
|
}
|
|
|
|
public void CheckDivisor(ulong divisor, in MontgomeryDivisorData divisorData, ulong divisorCycle, in ReadOnlySpan<ulong> primes, Span<byte> hits)
|
|
{
|
|
if (_disposed)
|
|
{
|
|
throw new ObjectDisposedException(nameof(DivisorScanSession));
|
|
}
|
|
|
|
int length = primes.Length;
|
|
// EvenPerfectBitScanner always supplies at least one exponent per divisor check, so the guard stays commented out.
|
|
// if (length == 0)
|
|
// {
|
|
// return;
|
|
// }
|
|
|
|
// The GPU divisor sessions only materialize odd moduli greater than one (q = 2kp + 1),
|
|
// so the defensive modulus guard stays commented out to keep the hot path branch-free.
|
|
// if (divisorData.Modulus <= 1UL || (divisorData.Modulus & 1UL) == 0UL)
|
|
// {
|
|
// hits.Clear();
|
|
// return;
|
|
// }
|
|
|
|
MontgomeryDivisorData cachedData = divisorData;
|
|
if (cachedData.Modulus != divisor)
|
|
{
|
|
cachedData = MontgomeryDivisorData.FromModulus(divisor);
|
|
}
|
|
|
|
ulong cycle = divisorCycle;
|
|
ulong firstPrime = primes[0];
|
|
|
|
if (cycle == 0UL)
|
|
{
|
|
if (!MersenneDivisorCycles.TryCalculateCycleLengthForExponent(divisor, firstPrime, cachedData, out ulong computedCycle, out bool primeOrderFailed) || computedCycle == 0UL)
|
|
{
|
|
cycle = MersenneDivisorCycles.CalculateCycleLength(divisor, cachedData, skipPrimeOrderHeuristic: primeOrderFailed);
|
|
}
|
|
else
|
|
{
|
|
cycle = computedCycle;
|
|
}
|
|
|
|
if (cycle == 0UL)
|
|
{
|
|
throw new InvalidOperationException("GPU divisor cycle length must be non-zero.");
|
|
}
|
|
}
|
|
|
|
// Precompute the initial cycle remainder on the host to keep the GPU kernel branch-free.
|
|
ulong firstRemainder = firstPrime % cycle;
|
|
|
|
Monitor.Enter(_lease.ExecutionLock);
|
|
|
|
EnsureExecutionResourcesLocked(length);
|
|
|
|
ArrayView1D<ulong, Stride1D.Dense> exponentView = _exponentsBuffer.View;
|
|
ArrayView1D<byte, Stride1D.Dense> hitView = _hitBuffer.View;
|
|
|
|
Span<ulong> hostSpan = _hostBuffer.AsSpan(0, length);
|
|
primes.CopyTo(hostSpan);
|
|
|
|
ArrayView1D<ulong, Stride1D.Dense> exponentSlice = exponentView.SubView(0, length);
|
|
exponentSlice.CopyFromCPU(ref MemoryMarshal.GetReference(hostSpan), length);
|
|
|
|
ArrayView1D<byte, Stride1D.Dense> hitSliceView = hitView.SubView(0, length);
|
|
var stepperKernel = _stepperKernel!;
|
|
// EnsureExecutionResourcesLocked binds the GPU stepper kernel during the first session launch, so the null check
|
|
// remains commented out to avoid a redundant branch on the production path.
|
|
// if (stepperKernel is null)
|
|
// {
|
|
// Monitor.Exit(_lease.ExecutionLock);
|
|
// throw new InvalidOperationException("GPU stepper kernel was not initialized.");
|
|
// }
|
|
|
|
stepperKernel(1, cachedData, cycle, firstRemainder, exponentSlice, hitSliceView);
|
|
|
|
Span<byte> hitSlice = hits.Slice(0, length);
|
|
hitSliceView.CopyToCPU(ref MemoryMarshal.GetReference(hitSlice), length);
|
|
|
|
Monitor.Exit(_lease.ExecutionLock);
|
|
}
|
|
|
|
public void Dispose()
|
|
{
|
|
if (_disposed)
|
|
{
|
|
return;
|
|
}
|
|
|
|
_disposed = true;
|
|
_owner._sessionPool.Add(this);
|
|
}
|
|
}
|
|
|
|
public ulong DivisorLimit
|
|
{
|
|
get
|
|
{
|
|
// The EvenPerfectBitScanner driver configures the GPU tester before exposing it to callers, so the previous synchronization guard remains commented out.
|
|
// lock (_sync)
|
|
// {
|
|
// if (!_isConfigured)
|
|
// {
|
|
// throw new InvalidOperationException("ConfigureFromMaxPrime must be called before using the tester.");
|
|
// }
|
|
|
|
// return _divisorLimit;
|
|
// }
|
|
|
|
return _divisorLimit;
|
|
}
|
|
}
|
|
|
|
private GpuContextPool.GpuContextLease RentAccelerator()
|
|
{
|
|
if (_acceleratorPool.TryTake(out var lease))
|
|
{
|
|
return lease;
|
|
}
|
|
|
|
return GpuContextPool.RentPreferred(preferCpu: false);
|
|
}
|
|
|
|
private void ReturnAccelerator(GpuContextPool.GpuContextLease lease) => _acceleratorPool.Add(lease);
|
|
|
|
private BatchResources RentBatchResources(Accelerator accelerator, int capacity)
|
|
{
|
|
var bag = _resourcePools.GetOrAdd(accelerator, static _ => []);
|
|
if (bag.TryTake(out BatchResources? resources))
|
|
{
|
|
return resources;
|
|
}
|
|
|
|
return new BatchResources(accelerator, capacity);
|
|
}
|
|
|
|
private void ReturnBatchResources(Accelerator accelerator, BatchResources resources) => _resourcePools.GetOrAdd(accelerator, static _ => []).Add(resources);
|
|
|
|
private sealed class BatchResources : IDisposable
|
|
{
|
|
internal BatchResources(Accelerator accelerator, int capacity)
|
|
{
|
|
int actualCapacity = Math.Max(1, capacity);
|
|
|
|
DivisorsBuffer = accelerator.Allocate1D<MontgomeryDivisorData>(actualCapacity);
|
|
ExponentBuffer = accelerator.Allocate1D<ulong>(actualCapacity);
|
|
HitsBuffer = accelerator.Allocate1D<byte>(actualCapacity);
|
|
HitIndexBuffer = accelerator.Allocate1D<int>(1);
|
|
ArrayPool<ulong> ulongPool = ThreadStaticPools.UlongPool;
|
|
Divisors = ulongPool.Rent(actualCapacity);
|
|
Exponents = ulongPool.Rent(actualCapacity);
|
|
DivisorData = ThreadStaticPools.MontgomeryDivisorDataPool.Rent(actualCapacity);
|
|
Capacity = actualCapacity;
|
|
}
|
|
|
|
internal readonly MemoryBuffer1D<MontgomeryDivisorData, Stride1D.Dense> DivisorsBuffer;
|
|
|
|
internal readonly MemoryBuffer1D<ulong, Stride1D.Dense> ExponentBuffer;
|
|
|
|
internal readonly MemoryBuffer1D<byte, Stride1D.Dense> HitsBuffer;
|
|
|
|
internal readonly MemoryBuffer1D<int, Stride1D.Dense> HitIndexBuffer;
|
|
|
|
internal readonly ulong[] Divisors;
|
|
|
|
internal readonly ulong[] Exponents;
|
|
|
|
internal readonly MontgomeryDivisorData[] DivisorData;
|
|
|
|
internal readonly int Capacity;
|
|
|
|
public void Dispose()
|
|
{
|
|
DivisorsBuffer.Dispose();
|
|
ExponentBuffer.Dispose();
|
|
HitsBuffer.Dispose();
|
|
HitIndexBuffer.Dispose();
|
|
ArrayPool<ulong> ulongPool = ThreadStaticPools.UlongPool;
|
|
ArrayPool<MontgomeryDivisorData> divisorPool = ThreadStaticPools.MontgomeryDivisorDataPool;
|
|
ulongPool.Return(Divisors, clearArray: false);
|
|
ulongPool.Return(Exponents, clearArray: false);
|
|
divisorPool.Return(DivisorData, clearArray: false);
|
|
}
|
|
}
|
|
|
|
|
|
private sealed class AcceleratorReferenceComparer : IEqualityComparer<Accelerator>
|
|
{
|
|
public static AcceleratorReferenceComparer Instance { get; } = new();
|
|
|
|
public bool Equals(Accelerator? x, Accelerator? y) => ReferenceEquals(x, y);
|
|
|
|
public int GetHashCode(Accelerator obj) => RuntimeHelpers.GetHashCode(obj);
|
|
}
|
|
|
|
public ulong GetAllowedMaxDivisor(ulong prime)
|
|
{
|
|
// The configuration is immutable after setup, so the cached limit can be read without locking.
|
|
// lock (_sync)
|
|
// {
|
|
// if (!_isConfigured)
|
|
// {
|
|
// throw new InvalidOperationException("ConfigureFromMaxPrime must be called before using the tester.");
|
|
// }
|
|
|
|
// return ComputeAllowedMaxDivisorGpu(prime, _divisorLimit);
|
|
// }
|
|
|
|
return ComputeAllowedMaxDivisorGpu(prime, _divisorLimit);
|
|
}
|
|
|
|
public DivisorScanSession CreateDivisorSession()
|
|
{
|
|
// The tester is configured once at startup and the session pool relies on thread-safe collections, so the previous synchronization guard stays commented out.
|
|
// lock (_sync)
|
|
// {
|
|
// if (!_isConfigured)
|
|
// {
|
|
// throw new InvalidOperationException("ConfigureFromMaxPrime must be called before using the tester.");
|
|
// }
|
|
|
|
// if (_sessionPool.TryTake(out DivisorScanSession? session))
|
|
// {
|
|
// session.Reset();
|
|
// return session;
|
|
// }
|
|
|
|
// return new DivisorScanSession(this);
|
|
// }
|
|
|
|
if (_sessionPool.TryTake(out DivisorScanSession? session))
|
|
{
|
|
session.Reset();
|
|
return session;
|
|
}
|
|
|
|
return new DivisorScanSession(this);
|
|
}
|
|
|
|
IMersenneNumberDivisorByDivisorTester.IDivisorScanSession IMersenneNumberDivisorByDivisorTester.CreateDivisorSession() => CreateDivisorSession();
|
|
}
|
|
|
|
|
|
|
|
|