mlemanczyk/even-perfect-numbers-scanner
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DivisorSet.Percentile, Additive and TopDown modes implemented. State files ported to LMDB => FASTER to avoid millions of files in folders.

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mlemanczyk committed 2026-01-04 12:17:27 +01:00
1 parent 27f65baf3d
commit 6a924f4041
18 files changed
+2619 -367
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PerfectNumbers.Core/Gpu/MersenneNumberDivisorByDivisorGpuPrimeScanSession.cs
+28 -20
View File
@@ -1,4 +1,5 @@
using System.Globalization;
using System.IO;
using System.Numerics;
namespace PerfectNumbers.Core.Gpu;
@@ -34,9 +35,7 @@ internal struct MersenneNumberDivisorByDivisorGpuPrimeScanSession
try
{
Console.WriteLine($"Processing {prime}");
string stateFile = Path.Combine(
PerfectNumberConstants.ByDivisorStateDirectory,
prime.ToString(CultureInfo.InvariantCulture) + ".bin");
string stateFile = prime.ToString(CultureInfo.InvariantCulture) + ".bin";
ConfigureForPrime(stateFile);
@@ -44,11 +43,6 @@ internal struct MersenneNumberDivisorByDivisorGpuPrimeScanSession
if (!isPrime)
{
if (!string.IsNullOrEmpty(stateFile) && File.Exists(stateFile))
{
File.Delete(stateFile);
}
_markComposite();
_printResult(prime, true, true, false, divisor);
Console.WriteLine($"Finished processing {prime}");
@@ -68,25 +62,39 @@ internal struct MersenneNumberDivisorByDivisorGpuPrimeScanSession
private void ConfigureForPrime(string stateFile)
{
#if DivisorSet_TopDown
BigInteger resumeK = EnvironmentConfiguration.MinK;
if (File.Exists(stateFile))
BigInteger lastK = BigInteger.Zero;
if (EnvironmentConfiguration.ByDivisorKStateRepository is not null)
{
if (MersenneNumberDivisorByDivisorTester.TryReadLastSavedK(stateFile, out BigInteger lastK))
if (ulong.TryParse(Path.GetFileNameWithoutExtension(stateFile), NumberStyles.None, CultureInfo.InvariantCulture, out ulong parsedPrime) &&
EnvironmentConfiguration.ByDivisorKStateRepository.TryGet(parsedPrime, out BigInteger storedK) &&
storedK > BigInteger.Zero)
{
resumeK = lastK + BigInteger.One;
_tester.ResumeFromState(stateFile, lastK, resumeK);
lastK = storedK;
}
else
{
_tester.ResumeFromState(stateFile, BigInteger.Zero, resumeK);
}
}
else
{
_tester.ResumeFromState(stateFile, BigInteger.Zero, resumeK);
}
_tester.ResumeFromState(stateFile, lastK, resumeK);
_tester.ResetStateTracking();
return;
#else
BigInteger resumeK = EnvironmentConfiguration.MinK;
BigInteger lastK = BigInteger.Zero;
if (EnvironmentConfiguration.ByDivisorKStateRepository is not null)
{
if (ulong.TryParse(Path.GetFileNameWithoutExtension(stateFile), NumberStyles.None, CultureInfo.InvariantCulture, out ulong parsedPrime) &&
EnvironmentConfiguration.ByDivisorKStateRepository.TryGet(parsedPrime, out BigInteger storedK) &&
storedK > BigInteger.Zero)
{
lastK = storedK;
resumeK = storedK + BigInteger.One;
}
}
_tester.ResumeFromState(stateFile, lastK, resumeK);
_tester.ResetStateTracking();
#endif
}
public void Dispose()