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faster rate counting

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This commit is contained in:
Andrew Meadows 2017-10-02 12:56:04 -07:00
parent 0fc6bf1e89
commit 7df8816a81
1 changed files with 7 additions and 7 deletions
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14
libraries/shared/src/shared/RateCounter.h
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@ -35,19 +35,19 @@ public:
uint32_t interval() const { return INTERVAL; }
private:
mutable uint64_t _start { usecTimestampNow() };
mutable uint64_t _expiry { usecTimestampNow() + INTERVAL * USECS_PER_MSEC};
mutable size_t _count { 0 };
const float _scale { powf(10, PRECISION) };
mutable std::atomic<float> _rate;
void checkRate() const {
auto now = usecTimestampNow();
float currentIntervalMs = (now - _start) / (float)USECS_PER_MSEC;
if (currentIntervalMs > (float)INTERVAL) {
float currentCount = _count;
float intervalSeconds = currentIntervalMs / (float)MSECS_PER_SECOND;
_rate = roundf(currentCount / intervalSeconds * _scale) / _scale;
_start = now;
if (now > _expiry) {
float MSECS_PER_USEC = 0.001f;
float SECS_PER_MSEC = 0.001f;
float intervalSeconds = ((float)INTERVAL + (float)(now - _expiry) * MSECS_PER_USEC) * SECS_PER_MSEC;
_rate = roundf((float)_count / intervalSeconds * _scale) / _scale;
_expiry = now + INTERVAL * USECS_PER_MSEC;
_count = 0;
};
}