43 lines
1,011 B
C++
43 lines
1,011 B
C++
#include "frontends/common2/timer.h"
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#include <ostream>
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#include <cmath>
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#include <iomanip>
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Timer::Timer()
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: mySum(0)
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, mySum2(0)
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, myN(0)
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{
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tic();
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}
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void Timer::tic()
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{
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myT0 = std::chrono::steady_clock::now();
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}
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void Timer::toc()
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{
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const auto now = std::chrono::steady_clock::now();
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const auto micros = std::chrono::duration_cast<std::chrono::microseconds>(now - myT0).count();
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const double s = micros * 0.000001;
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mySum += s;
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mySum2 += s * 2;
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++myN;
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myT0 = now;
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}
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std::ostream& operator<<(std::ostream& os, const Timer & timer)
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{
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const double m1 = timer.mySum / timer.myN;
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const double m2 = timer.mySum2 / timer.myN;
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const double std = std::sqrt(std::max(0.0, m2 - m1 * m1));
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const double scale = 1000;
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os << std::fixed << std::setprecision(2);
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os << "total = " << std::setw(9) << timer.mySum * scale;
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os << ", average = " << std::setw(9) << m1 * scale;
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os << ", std = " << std::setw(9) << std * scale;
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os << ", n = " << std::setw(6) << timer.myN;
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return os;
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}
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