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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "job_load_sampler.h"
#include <cassert>
namespace proton {
void
JobLoadSampler::updateIntegral(time_point now, uint32_t jobCnt)
{
assert(now >= _lastUpdateTime);
std::chrono::duration<double> duration = now - _lastUpdateTime;
_loadIntegral += duration.count() * jobCnt;
_lastUpdateTime = now;
}
JobLoadSampler::JobLoadSampler(time_point now)
: _lastSampleTime(now),
_lastUpdateTime(now),
_currJobCnt(0),
_loadIntegral(0)
{
}
void
JobLoadSampler::startJob(time_point now)
{
updateIntegral(now, _currJobCnt++);
}
void
JobLoadSampler::endJob(time_point now)
{
updateIntegral(now, _currJobCnt--);
}
double
JobLoadSampler::sampleLoad(time_point now)
{
assert(now >= _lastSampleTime);
updateIntegral(now, _currJobCnt);
std::chrono::duration<double> duration = now - _lastSampleTime;
double load = (duration.count() > 0) ? (_loadIntegral / duration.count()) : 0;
_lastSampleTime = now;
_loadIntegral = 0;
return load;
}
} // namespace proton
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