Comparing performance of LINQ and PLINQ Min, Max and Average methods. - CSharp LINQ

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Description

Comparing performance of LINQ and PLINQ Min, Max and Average methods.

Demo Code

using System;//from   w  w w  .jav  a2  s  . co  m
using System.Linq;
class MainClass
{
   static void Main()
   {
      var random = new Random();
      int[] values = Enumerable.Range(1, 99999999)
      .Select(x => random.Next(1, 1000))
      .ToArray();
      // time the Min, Max and Average LINQ extension methods
      Console.WriteLine("Min, Max and Average with LINQ to Objects using a single core");
      var linqStart = DateTime.Now; // get time before method calls
      var linqMin = values.Min();
      var linqMax = values.Max();
      var linqAverage = values.Average();
      var linqEnd = DateTime.Now; // get time after method calls
      var linqTime = linqEnd.Subtract(linqStart).TotalMilliseconds;
      DisplayResults(linqMin, linqMax, linqAverage, linqTime);
      // time the Min, Max and Average PLINQ extension methods
      Console.WriteLine("\nMin, Max and Average with PLINQ using multiple cores");
      var plinqStart = DateTime.Now; // get time before method calls
      var plinqMin = values.AsParallel().Min();
      var plinqMax = values.AsParallel().Max();
      var plinqAverage = values.AsParallel().Average();
      var plinqEnd = DateTime.Now; // get time after method calls
      var plinqTime = plinqEnd.Subtract(plinqStart).TotalMilliseconds;
      DisplayResults(plinqMin, plinqMax, plinqAverage, plinqTime);
      Console.WriteLine("\nPLINQ took " + $"{((linqTime - plinqTime) / linqTime):P0}" + " less time than LINQ");
   }
   static void DisplayResults(int min, int max, double average, double time)
   {
      Console.WriteLine($"Min: {min}\nMax: {max}\n" + $"Average: {average:F}\nTotal time in milliseconds: {time:F}");
   }
}

Result


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