public static void StartSieve(BigInteger max, CancellationToken?token)
{
var help = Max;
Max = max;
CustomConsole.WriteLine($"Calculating Primes till {Max} with 1 Thread and PrimeSieve...");
var watch = new Stopwatch();
watch.Start();
var primes = StaticPrime.PrimeSieve((int)Max, token);
watch.Stop();
var elapsed = watch.Elapsed.ToString();
CustomConsole.WriteLine(
$"Calculation finished in {double.Parse(elapsed.Substring(elapsed.LastIndexOf(":", StringComparison.Ordinal) + 1))} Seconds.");
CustomConsole.NewLine();
watch.Reset();
CustomConsole.WriteLine("Writing to file...");
watch.Start();
FileHelper.Restart();
FileHelper.WriteFile(primes);
FileHelper.Dispose();
watch.Stop();
CustomConsole.WriteLine($"Finished in {watch.Elapsed.ToString()}.");
CustomConsole.NewLine();
Max = help;
}
public static void Start(CancellationToken?token)
{
var watch = new Stopwatch();
CustomConsole.ReplaceLine("Picking up, where we left off...");
var lastPrime = FileHelper.FindLastPrime();
if (lastPrime >= Max - 100)
{
CustomConsole.ReplaceLine($"Already found {lastPrime}.");
return;
}
CustomConsole.ReplaceLine($"Starting at {lastPrime}.");
if (lastPrime < MaxSieveValue)
{
StartSieve(MaxSieveValue >= Max ? Max : MaxSieveValue, token);
lastPrime = FileHelper.FindLastPrime();
if (lastPrime >= Max - 100)
{
return;
}
}
System.Threading.Thread.Sleep(1000);
CustomConsole.WriteLine("Starting calculation...");
watch.Start();
var current = lastPrime;
for (BigInteger i = 0;
current < Max && !(token?.IsCancellationRequested ?? false);
current = lastPrime + ++i * Step)
{
CustomConsole.ReplaceLine($"Calculating till {current + Step}...");
var bag = new ConcurrentBag <BigInteger>();
ParallelFor(current, current + Step, n =>
{
if (StaticPrime.IsPrime(n))
{
bag.Add(n);
}
});
var list = bag.ToList();
list.Sort();
FileHelper.WriteFile(list);
}
watch.Stop();
FileHelper.Dispose();
CustomConsole.NewLine();
CustomConsole.WriteLine(
$"Calculated for: {watch.Elapsed.ToString().Substring(0, watch.Elapsed.ToString().LastIndexOf('.'))}. Biggest Prime found: {FileHelper.FindLastPrime()}"
);
}
