Method sampleIoRate

common/script/scriptconsole.cpp:230–247

}

void ScriptConsole::sampleIoRate(void)
{
    // The window closes twice a second: often enough to react to a stall,
    // seldom enough that the figure on screen is a speed and not a flicker.
    // The clock read itself is per call — it lands on the copy loop, so keep
    // this function to exactly that one syscall-free read and no allocation.
    const auto now    = std::chrono::steady_clock::now();
    const double secs = std::chrono::duration<double>(now - mIoRateAt).count();
    if (secs < 0.5) {
        return;
    }
    const double sample = (double)(mIo.done - mIoRateDone) / secs;
    // Smoothed, or the figure jitters by megabytes between frames and reads as
    // noise rather than as a speed.
    mIo.rate    = mIo.rate > 0.0 ? mIo.rate * 0.6 + sample * 0.4 : sample;
    mIoRateAt   = now;
    mIoRateDone = mIo.done;
}

void ScriptConsole::setIo(long long done)
{