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<h1>Primes Counter</h1> | |
<p>@_output</p> | |
<button class="btn btn-primary" @onclick="CountPrimesSingleThreaded">Single Threaded</button> | |
<button class="btn btn-primary" @onclick="CountPrimesMultiThreaded">Multi Threaded</button> | |
@code { | |
private string _output = "Not yet executed"; | |
private void CountPrimesSingleThreaded() { | |
int total = 0; | |
var sw = System.Diagnostics.Stopwatch.StartNew(); | |
for (int n = 1; n <= 20_000_000; n++) { | |
if (IsPrime(n)) System.Threading.Interlocked.Increment(ref total); | |
} | |
sw.Stop(); | |
_output = $"Single Threaded: {total} Primes in {sw.Elapsed}"; | |
} | |
private void CountPrimesMultiThreaded() { | |
int total = 0; | |
var sw = System.Diagnostics.Stopwatch.StartNew(); | |
Parallel.For(1, 20_000_001, n => { | |
if (IsPrime(n)) System.Threading.Interlocked.Increment(ref total); | |
}); | |
sw.Stop(); | |
_output = $"Multi Threaded: {total} Primes in {sw.Elapsed}"; | |
} | |
public static bool IsPrime(int number) { | |
if ((number % 2) == 0) { | |
return number == 2; | |
} | |
int sqrt = (int)Math.Sqrt(number); | |
for (int t = 3; t <= sqrt; t = t + 2) { | |
if (number % t == 0) { | |
return false; | |
} | |
} | |
return number != 1; | |
} | |
} |
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