write results to csv (#130)

* write to excel

* add results

* fix percentage output

Author: bitfaster

BitFaster.Caching.HitRateAnalysis/Wikibench/Analysis.cs

@@ -1,9 +1,12 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using BitFaster.Caching.Lru;
+using CsvHelper;
 
 namespace BitFaster.Caching.HitRateAnalysis.Wikibench
 {
@@ -18,6 +21,12 @@ public Analysis(int cacheSize)
             this.classicLru = new ClassicLru<Uri, int>(1, cacheSize, EqualityComparer<Uri>.Default);
         }
 
+        public int CacheSize => this.concurrentLru.Capacity;
+
+        public double ConcurrentLruHitRate => this.concurrentLru.HitRatio * 100;
+
+        public double ClassicLruHitRate => this.classicLru.HitRatio * 100;
+
         public void TestUri(Uri uri)
         {
             this.concurrentLru.GetOrAdd(uri, u => 1);
@@ -33,5 +42,14 @@ private static string FormatHits(double hitRate)
         { 
             return string.Format("{0:N2}%", hitRate * 100.0);
         }
+
+        public static void WriteToFile(string path, IEnumerable<Analysis> results)
+        {
+            using (var writer = new StreamWriter(path))
+            using (var csv = new CsvWriter(writer, CultureInfo.InvariantCulture))
+            {
+                csv.WriteRecords(results);
+            }
+        }
     }
 }

BitFaster.Caching.HitRateAnalysis/Wikibench/Runner.cs

@@ -50,6 +50,8 @@ public static async Task Run()
             {
                 a.Compare();
             }
+
+            Analysis.WriteToFile("results.wikibench.csv", analysis);
         }
     }
 }

BitFaster.Caching.HitRateAnalysis/results.wikibench.csv

@@ -0,0 +1,9 @@
+CacheSize,ConcurrentLruHitRate,ClassicLruHitRate
+25,30.748543935794594,12.339894258281078
+50,38.54143501776577,21.441939220308402
+75,42.52123346830987,27.84286871100062
+100,45.1025591654474,32.25609649363885
+125,47.21936919103159,35.30941454952625
+150,48.687634020955905,37.484624347754924
+175,49.932971822611414,39.10013286561485
+200,50.83386468801666,40.35904822418645