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//------------------------------------------------------------------------------
// Author: Andrey Kuznetsov
// Description: Helpers for parsing CIFS v2 structures.
// Copyright (c) 2015 EPAM Systems
//------------------------------------------------------------------------------
/*
This file is part of Nfstrace.
Nfstrace is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, version 2 of the License.
Nfstrace is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Nfstrace. If not, see <http://www.gnu.org/licenses/>.
*/
//------------------------------------------------------------------------------
#include <cmath>
#include "latencies.h"
//------------------------------------------------------------------------------
using namespace NST::breakdown;
//------------------------------------------------------------------------------
Latencies::Latencies() : count {0}, avg {0}, m2 {0}
{
timerclear(&min);
timerclear(&max);
}
void Latencies::add(const timeval& t)
{
long double x = to_sec(t);
long double delta = x - avg;
avg += delta / (++count);
m2 += delta * (x - avg);
set_range(t);
}
uint64_t Latencies::get_count() const
{
return count;
}
long double Latencies::get_avg() const
{
return avg;
}
long double Latencies::get_st_dev() const
{
if (count < 2)
{
return 0;
}
return sqrt(m2 / (count - 1));
}
const timeval& Latencies::get_min() const
{
return min;
}
const timeval& Latencies::get_max() const
{
return max;
}
void Latencies::set_range(const timeval& t)
{
if (timercmp(&t, &min, < ))
{
min = t;
}
if (min.tv_sec == 0 && min.tv_usec == 0)
{
min = t;
}
if (timercmp(&t, &max, > ))
{
max = t;
}
}
long double NST::breakdown::to_sec(const timeval& val)
{
return static_cast<long double>(val.tv_sec) + val.tv_usec / 1000000.0L;
}
//------------------------------------------------------------------------------
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