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
- Sharing a single count variable across threads
- Benchmarking thread completion time
- 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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