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PerformanceSample.cpp
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PerformanceSample.cpp
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/*
* Copyright (C) 2005-2008 Team XBMC
* http://www.xbmc.org
*
* This Program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This Program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with XBMC; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
* http://www.gnu.org/copyleft/gpl.html
*
*/
#include "system.h"
#include "PerformanceSample.h"
#ifdef _LINUX
#include "linux/PlatformInclude.h"
#endif
#include <SDL/SDL.h>
#include "Application.h"
#include "log.h"
#include "TimeUtils.h"
using namespace std;
int64_t CPerformanceSample::m_tmFreq;
CPerformanceSample::CPerformanceSample(const string &statName, bool bCheckWhenDone)
{
m_statName = statName;
m_bCheckWhenDone = bCheckWhenDone;
if (m_tmFreq == 0LL)
m_tmFreq = CurrentHostFrequency();
Reset();
}
CPerformanceSample::~CPerformanceSample()
{
if (m_bCheckWhenDone)
CheckPoint();
}
void CPerformanceSample::Reset()
{
m_tmStart = CurrentHostCounter();
#ifdef _LINUX
if (getrusage(RUSAGE_SELF, &m_usage) == -1)
CLog::Log(LOGERROR,"error %d in getrusage", errno);
#endif
}
void CPerformanceSample::CheckPoint()
{
#ifdef HAS_PERFORMANCE_SAMPLE
int64_t tmNow;
tmNow = CurrentHostCounter();
double elapsed = (double)(tmNow - m_tmStart) / (double)m_tmFreq.QuadPart;
double dUser=0.0, dSys=0.0;
#ifdef _LINUX
struct rusage usage;
if (getrusage(RUSAGE_SELF, &usage) == -1)
CLog::Log(LOGERROR,"error %d in getrusage", errno);
else
{
dUser = ( ((double)usage.ru_utime.tv_sec + (double)usage.ru_utime.tv_usec / 1000000.0) -
((double)m_usage.ru_utime.tv_sec + (double)m_usage.ru_utime.tv_usec / 1000000.0) );
dSys = ( ((double)usage.ru_stime.tv_sec + (double)usage.ru_stime.tv_usec / 1000000.0) -
((double)m_usage.ru_stime.tv_sec + (double)m_usage.ru_stime.tv_usec / 1000000.0) );
}
#endif
g_application.GetPerformanceStats().AddSample(m_statName, PerformanceCounter(elapsed,dUser,dSys));
#endif
Reset();
}
double CPerformanceSample::GetEstimatedError()
{
if (m_tmFreq == 0LL)
m_tmFreq = CurrentHostFrequency();
int64_t tmStart, tmEnd;
tmStart = CurrentHostCounter();
for (int i=0; i<100000;i++)
{
int64_t tmDummy;
tmDummy = CurrentHostCounter();
}
tmEnd = CurrentHostCounter();
double elapsed = (double)(tmEnd - tmStart) / (double)m_tmFreq;
return (elapsed / 100000.0) * 2.0; // one measure at start time and another when done.
}