How can I calculate how many hashes I generate per second?

I have a function which generates hashes from a string:

string GenerateHash(string plainText);

I generate as many hashes as possible with 4 threads.

How do I calculate how many hashes (or megahashes) I generate per second?

Your problem breaks down nicely into 3 separate tasks

1. Sharing a single count variable across threads
2. Benchmarking thread completion time
3. Calculating hashes per/second

Sharing a single count variable across threads

public static class GlobalCounter
{ public static int Value { get; 
private set; 
} public static void Increment() 
{ Value =GetNextValue(Value);
 } private static int GetNextValue(int curValue) { returnInterlocked.Increment(ref curValue); 
} public static void Reset() { Value = 0; } }

Before you spin off the threads call GlobalCounter.Reset and then in each thread (after each successful hash) you would call GlobalCounter.Increment – using Interlocked.X performs atomic operations of Value in a thread-safe manner, it’s also much faster than lock.

Benchmarking thread completion time

var sw = Stopwatch.StartNew(); Parallel.ForEach(someCollection, someValue => 
{ // generate hash GlobalCounter.Increment(); 
}); sw.Stop();

Parallel.ForEach will block until all threads have finished

Calculating hashes per second

... sw.Stop(); var hashesPerSecond = GlobalCounter.Value / sw.Elapsed.Seconds;

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