mlemanczyk/even-perfect-numbers-scanner
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--gpu-ration command-line argument added. AscendingDivisorRemainderStepper implemented in PrimeTester.IsPrimeCpu. PrimeOrderCalculator.RunOnCpu adjusted for low GPU ratios to prevent infinite increase of the counter.

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mlemanczyk committed 2025-12-02 23:36:18 +01:00
1 parent f43c67c86f
commit 85a90c70bf
9 files changed
+296 -212
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EvenPerfectBitScanner/CliArguments.cs
+24 -12
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@@ -51,8 +51,9 @@ internal readonly struct CliArguments
internal readonly double ZeroFractionConjecture;
internal readonly int MaxZeroConjecture;
internal readonly ulong MinK;
internal readonly int GpuRatio;
private CliArguments(
private CliArguments(
ulong startPrime,
bool startPrimeProvided,
UInt128 maxPrimeLimit,
@@ -95,7 +96,8 @@ internal readonly struct CliArguments
double zeroFractionHard,
double zeroFractionConjecture,
int maxZeroConjecture,
ulong minK)
ulong minK,
int gpuRatio)
{
StartPrime = startPrime;
StartPrimeProvided = startPrimeProvided;
@@ -140,6 +142,7 @@ internal readonly struct CliArguments
ZeroFractionConjecture = zeroFractionConjecture;
MaxZeroConjecture = maxZeroConjecture;
MinK = minK;
GpuRatio = gpuRatio;
}
internal bool UseFilter => !TestMode && !string.IsNullOrEmpty(FilterFile);
@@ -189,6 +192,7 @@ internal readonly struct CliArguments
double zeroFractionConjecture = -1.0;
int maxZeroConjecture = -1;
ulong minK = 1UL;
int gpuRatio = PerfectNumberConstants.GpuRatio;
foreach (string argument in args)
{
@@ -239,6 +243,12 @@ internal readonly struct CliArguments
continue;
}
if (argument.StartsWith("--gpu-ratio=", StringComparison.OrdinalIgnoreCase))
{
gpuRatio = Math.Max(1, Utf8CliParser.ParseInt32(argument.AsSpan("--gpu-ratio=".Length)));
continue;
}
if (argument.StartsWith("--threads=", StringComparison.OrdinalIgnoreCase))
{
threadCount = Math.Max(1, Utf8CliParser.ParseInt32(argument.AsSpan("--threads=".Length)));
@@ -590,7 +600,8 @@ internal readonly struct CliArguments
zeroFractionHard,
zeroFractionConjecture,
maxZeroConjecture,
minK);
minK,
gpuRatio);
}
internal static void PrintHelp()
@@ -598,22 +609,23 @@ internal readonly struct CliArguments
Console.WriteLine("Usage: EvenPerfectBitScanner [options]");
Console.WriteLine();
Console.WriteLine("Options:");
Console.WriteLine(" --block-size=<value> values processed per thread batch");
Console.WriteLine(" --prime=<value> starting exponent (p)");
Console.WriteLine(" --max-prime=<value> inclusive upper bound for primes from filter files");
Console.WriteLine(" --increment=bit|add exponent increment method");
Console.WriteLine(" --increment=bit|add exponent increment method (default add)");
Console.WriteLine(" --threads=<value> number of worker threads");
Console.WriteLine(" --block-size=<value> values processed per thread batch");
Console.WriteLine(" --mersenne=pow2mod|incremental|lucas|residue|divisor|bydivisor Mersenne test method");
Console.WriteLine(" --residue-max-k=<value> max k for residue Mersenne test (q = 2*p*k + 1)");
Console.WriteLine(" --residue-max-k=<value> max k for residue Mersenne test (q = 2*p*k + 1)");
Console.WriteLine(" --mersenne-device=cpu|gpu|hybrid Device for Mersenne method (default gpu)");
Console.WriteLine(" --primes-device=cpu|gpu Device for prime-scan kernels (default gpu)");
Console.WriteLine(" --gpu-prime-batch=<n> Batch size for GPU primality sieve (default 262144)");
Console.WriteLine(" --order-device=cpu|gpu|hybrid Device for order computations (default gpu)");
Console.WriteLine(" --ntt=reference|staged GPU NTT backend (default staged)");
Console.WriteLine(" --mod-reduction=auto|uint128|mont64|barrett128 staged NTT reduction (default auto)");
Console.WriteLine(" --primes-device=cpu|gpu device for prime-scan kernels (default gpu)");
Console.WriteLine(" --gpu-prime-batch=<n> batch size for GPU primality sieve (default 262144)");
Console.WriteLine($" --gpu-ratio=<n> ratio of GPU operations vs CPU in hybrid device mode (default {PerfectNumberConstants.GpuRatio})");
Console.WriteLine(" --gpu-prime-threads=<value> max concurrent GPU prime checks (default 1)");
Console.WriteLine(" --ll-slice=<value> Lucas–Lehmer iterations per slice (default 32)");
Console.WriteLine(" --gpu-scan-batch=<value> GPU q-scan batch size (default 2_097_152)");
Console.WriteLine(" --order-device=cpu|gpu|hybrid Device for order computations (default gpu)");
Console.WriteLine(" --ll-slice=<value> Lucas–Lehmer iterations per slice (default 32)");
Console.WriteLine(" --mod-reduction=auto|uint128|mont64|barrett128 staged NTT reduction (default auto)");
Console.WriteLine(" --ntt=reference|staged GPU NTT backend (default staged)");
Console.WriteLine(" --order-warmup-limit=<value> Warm-up order candidates (default 5_000_000)");
Console.WriteLine(" --rle-blacklist=<path> enable RLE blacklist for p (hard filter up to --rle-hard-max)");
Console.WriteLine(" --rle-hard-max=<p> apply RLE blacklist only for p <= this (default ulong.MaxValue = no limit)");