code.vuplus.com Git - vuplus_xbmc/blob - xbmc/utils/PerformanceSample.cpp

   1 /*
   2  *      Copyright (C) 2005-2013 Team XBMC
   3  *      http://www.xbmc.org
   4  *
   5  *  This Program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2, or (at your option)
   8  *  any later version.
   9  *
  10  *  This Program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with XBMC; see the file COPYING.  If not, see
  17  *  <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #include "system.h"
  22 #include "PerformanceSample.h"
  23
  24 #ifdef _LINUX
  25 #include "linux/PlatformInclude.h"
  26 #endif
  27
  28 #include "Application.h"
  29 #include "log.h"
  30 #include "TimeUtils.h"
  31
  32 using namespace std;
  33
  34 int64_t CPerformanceSample::m_tmFreq;
  35
  36 CPerformanceSample::CPerformanceSample(const string &statName, bool bCheckWhenDone)
  37 {
  38   m_statName = statName;
  39   m_bCheckWhenDone = bCheckWhenDone;
  40   if (m_tmFreq == 0LL)
  41     m_tmFreq = CurrentHostFrequency();
  42
  43   Reset();
  44 }
  45
  46 CPerformanceSample::~CPerformanceSample()
  47 {
  48   if (m_bCheckWhenDone)
  49     CheckPoint();
  50 }
  51
  52 void CPerformanceSample::Reset()
  53 {
  54   m_tmStart = CurrentHostCounter();
  55 #ifdef _LINUX
  56   if (getrusage(RUSAGE_SELF, &m_usage) == -1)
  57     CLog::Log(LOGERROR,"error %d in getrusage", errno);
  58 #endif
  59 }
  60
  61 void CPerformanceSample::CheckPoint()
  62 {
  63 #ifdef HAS_PERFORMANCE_SAMPLE
  64   int64_t tmNow;
  65   tmNow = CurrentHostCounter();
  66   double elapsed = (double)(tmNow - m_tmStart) / (double)m_tmFreq.QuadPart;
  67
  68   double dUser=0.0, dSys=0.0;
  69 #ifdef _LINUX
  70   struct rusage usage;
  71   if (getrusage(RUSAGE_SELF, &usage) == -1)
  72     CLog::Log(LOGERROR,"error %d in getrusage", errno);
  73   else
  74   {
  75     dUser = ( ((double)usage.ru_utime.tv_sec + (double)usage.ru_utime.tv_usec / 1000000.0) -
  76               ((double)m_usage.ru_utime.tv_sec + (double)m_usage.ru_utime.tv_usec / 1000000.0) );
  77     dSys  = ( ((double)usage.ru_stime.tv_sec + (double)usage.ru_stime.tv_usec / 1000000.0) -
  78               ((double)m_usage.ru_stime.tv_sec + (double)m_usage.ru_stime.tv_usec / 1000000.0) );
  79   }
  80 #endif
  81
  82   g_application.GetPerformanceStats().AddSample(m_statName, PerformanceCounter(elapsed,dUser,dSys));
  83 #endif
  84
  85   Reset();
  86 }
  87
  88 double CPerformanceSample::GetEstimatedError()
  89 {
  90   if (m_tmFreq == 0LL)
  91     m_tmFreq = CurrentHostFrequency();
  92
  93   int64_t tmStart, tmEnd;
  94   tmStart = CurrentHostCounter();
  95
  96   for (int i=0; i<100000;i++)
  97   {
  98     DECLARE_UNUSED(int64_t,tmDummy);
  99     tmDummy = CurrentHostCounter();
 100   }
 101
 102   tmEnd = CurrentHostCounter();
 103   double elapsed = (double)(tmEnd - tmStart) / (double)m_tmFreq;
 104
 105   return (elapsed / 100000.0) * 2.0; // one measure at start time and another when done.
 106 }
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