BesTimer.cxx

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// this is -*- c++ -*-
// $Id: BesTimer.cxx,v 1.4 2011/02/18 04:23:58 maqm Exp $
// $Name: BesTimerSvc-00-00-12 $
#include <sys/time.h>
#include   <complex>   
 
#include "BesTimerSvc/BesTimer.h"
 
#define SecsInDay 86400
 
    BesTimer::BesTimer (const std::string name)
      : m_name (name) {
      m_numberOfMeasurements = 0;
      m_mean = 0.0;
      m_ms = 0.0;
      m_elapsed = 0.0;
      m_started=false;
      m_paused=false;
      m_propVal = 0;
      m_meanVal = 0;
      m_meanTimePerObject = 0.0;
      m_NmeanTimePerObject = 0;
    }
    
    void BesTimer::start( void ) {
      struct timeval tv;
 
      m_started = true;
      m_paused = false;
      m_elapsed = 0.0;
      m_propVal = 0;
      // if already started, the start time will be over-written
      gettimeofday(&tv, 0);
      m_startTime = tv;
    }
    
    void BesTimer::stop ( void ) {
      struct timeval tv;
      
      if (!m_started) return;
 
      gettimeofday(&tv, 0);
      m_started = false;
      
      if (!m_paused) {
    float mtime;
    int secs, usecs;
    
    if (tv.tv_sec >= m_startTime.tv_sec) {
      secs = tv.tv_sec - m_startTime.tv_sec;
    } else {
      secs = tv.tv_sec - m_startTime.tv_sec + SecsInDay;
    }
    usecs = tv.tv_usec - m_startTime.tv_usec;
    mtime = static_cast<float>(secs)*1000. + static_cast<float>(usecs)/1000.;
 
    // elapsed time
    m_elapsed += mtime;
    
      }
 
      // statistics - mean, rms
      double denom = static_cast <double> (++m_numberOfMeasurements);
      double d = m_elapsed - m_mean;
      m_mean += d / denom;
      double dd = m_elapsed*m_elapsed - m_ms;
      m_ms += dd / denom;
 
      // mean property 
      m_meanVal += static_cast <double> (m_propVal - m_meanVal) / denom;
      if (m_propVal !=0) {
    double timePerObject = m_elapsed/static_cast <double>(m_propVal);
    m_meanTimePerObject += static_cast <double> (timePerObject - m_meanTimePerObject) / 
      static_cast<double> (++m_NmeanTimePerObject);
      }
    }
    
    void BesTimer::pause ( void ) {
      struct timeval tv;
 
      // only pause if started
      // a pause while paused is ignored 
      if (m_paused || !m_started) return;
      m_paused = true;
      gettimeofday(&tv, 0);
 
      float mtime;
      int secs, usecs;
      
      if (tv.tv_sec >= m_startTime.tv_sec) {
    secs = tv.tv_sec - m_startTime.tv_sec;
      } else {
    secs = tv.tv_sec - m_startTime.tv_sec + SecsInDay;
      }
      usecs = tv.tv_usec - m_startTime.tv_usec;
      mtime = static_cast<float>(secs)*1000. + static_cast<float>(usecs)/1000.;
      m_elapsed += mtime; // time so far
    }
 
    void BesTimer::resume( void ) {
      struct timeval tv;
 
      if (!m_started) { 
    start(); // resume acts as start if not started
      } else if (m_paused) {
    m_paused = false;
    gettimeofday(&tv, 0);
    m_startTime = tv;
      }
    }
 
    void BesTimer::reset () { 
      if (!m_started) {
    m_elapsed = 0.0; 
    m_propVal = 0;
      }
    }