mcs/class/System/System.Diagnostics/CounterSampleCalculator.cs

   1 //
   2 // System.Diagnostics.CounterSampleCalculator.cs
   3 //
   4 // Authors:
   5 //   Jonathan Pryor (jonpryor@vt.edu)
   6 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //
   8 // (C) 2002
   9 // (C) 2003 Andreas Nahr
  10 //
  11
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System;
  34
  35 namespace System.Diagnostics {
  36
  37         public static class CounterSampleCalculator {
  38
  39                 public static float ComputeCounterValue (CounterSample newSample)
  40                 {
  41                         switch (newSample.CounterType) {
  42                         case PerformanceCounterType.RawFraction:
  43                         case PerformanceCounterType.NumberOfItems32:
  44                         case PerformanceCounterType.NumberOfItemsHEX32:
  45                         case PerformanceCounterType.NumberOfItems64:
  46                         case PerformanceCounterType.NumberOfItemsHEX64:
  47                                 return (float)newSample.RawValue;
  48                         default:
  49                                 return 0;
  50                         }
  51                 }
  52
  53                 [MonoTODO("What's the algorithm?")]
  54                 public static float ComputeCounterValue (CounterSample oldSample,
  55                         CounterSample newSample)
  56                 {
  57                         if (newSample.CounterType != oldSample.CounterType)
  58                                 throw new Exception ("The counter samples must be of the same type");
  59                         switch (newSample.CounterType) {
  60                         case PerformanceCounterType.RawFraction:
  61                         case PerformanceCounterType.NumberOfItems32:
  62                         case PerformanceCounterType.NumberOfItemsHEX32:
  63                         case PerformanceCounterType.NumberOfItems64:
  64                         case PerformanceCounterType.NumberOfItemsHEX64:
  65                                 return (float)newSample.RawValue;
  66                         case PerformanceCounterType.AverageCount64:
  67                                 return (float)(newSample.RawValue - oldSample.RawValue)/(float)(newSample.BaseValue - oldSample.BaseValue);
  68                         case PerformanceCounterType.AverageTimer32:
  69                                 return (((float)(newSample.RawValue - oldSample.RawValue))/newSample.SystemFrequency)/(float)(newSample.BaseValue - oldSample.BaseValue);
  70                         case PerformanceCounterType.CounterDelta32:
  71                         case PerformanceCounterType.CounterDelta64:
  72                                 return (float)(newSample.RawValue - oldSample.RawValue);
  73                         case PerformanceCounterType.CounterMultiTimer:
  74                                 return ((float)(newSample.RawValue - oldSample.RawValue))/(float)(newSample.TimeStamp - oldSample.TimeStamp) * 100.0f/newSample.BaseValue;
  75                         case PerformanceCounterType.CounterMultiTimer100Ns:
  76                                 return ((float)(newSample.RawValue - oldSample.RawValue))/(float)(newSample.TimeStamp100nSec - oldSample.TimeStamp100nSec) * 100.0f/newSample.BaseValue;
  77                         case PerformanceCounterType.CounterMultiTimerInverse:
  78                                 return (newSample.BaseValue - ((float)(newSample.RawValue - oldSample.RawValue))/(float)(newSample.TimeStamp - oldSample.TimeStamp)) * 100.0f;
  79                         case PerformanceCounterType.CounterMultiTimer100NsInverse:
  80                                 return (newSample.BaseValue - ((float)(newSample.RawValue - oldSample.RawValue))/(float)(newSample.TimeStamp100nSec - oldSample.TimeStamp100nSec)) * 100.0f;
  81                         case PerformanceCounterType.CounterTimer:
  82                         case PerformanceCounterType.CountPerTimeInterval32:
  83                         case PerformanceCounterType.CountPerTimeInterval64:
  84                                 return ((float)(newSample.RawValue - oldSample.RawValue))/(float)(newSample.TimeStamp - oldSample.TimeStamp);
  85                         case PerformanceCounterType.CounterTimerInverse:
  86                                 return (1.0f - ((float)(newSample.RawValue - oldSample.RawValue))/(float)(newSample.TimeStamp100nSec - oldSample.TimeStamp100nSec)) * 100.0f;
  87                         case PerformanceCounterType.ElapsedTime:
  88                                 // FIXME
  89                                 return 0;
  90                         case PerformanceCounterType.Timer100Ns:
  91                                 return ((float)(newSample.RawValue - oldSample.RawValue))/(float)(newSample.TimeStamp - oldSample.TimeStamp) * 100.0f;
  92                         case PerformanceCounterType.Timer100NsInverse:
  93                                 return (1f - ((float)(newSample.RawValue - oldSample.RawValue))/(float)(newSample.TimeStamp - oldSample.TimeStamp)) * 100.0f;
  94                         case PerformanceCounterType.RateOfCountsPerSecond32:
  95                         case PerformanceCounterType.RateOfCountsPerSecond64:
  96                                 return ((float)(newSample.RawValue - oldSample.RawValue))/(float)(newSample.TimeStamp - oldSample.TimeStamp) * 10000000;
  97                         default:
  98                                 Console.WriteLine ("Counter type {0} not handled", newSample.CounterType);
  99                                 return 0;
 100                         }
 101                 }
 102         }
 103 }
 104