mirror of https://github.com/aria2/aria2
116 lines
3.2 KiB
C++
116 lines
3.2 KiB
C++
/* <!-- copyright */
|
|
/*
|
|
* aria2 - The high speed download utility
|
|
*
|
|
* Copyright (C) 2006 Tatsuhiro Tsujikawa
|
|
*
|
|
* This program 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; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* In addition, as a special exception, the copyright holders give
|
|
* permission to link the code of portions of this program with the
|
|
* OpenSSL library under certain conditions as described in each
|
|
* individual source file, and distribute linked combinations
|
|
* including the two.
|
|
* You must obey the GNU General Public License in all respects
|
|
* for all of the code used other than OpenSSL. If you modify
|
|
* file(s) with this exception, you may extend this exception to your
|
|
* version of the file(s), but you are not obligated to do so. If you
|
|
* do not wish to do so, delete this exception statement from your
|
|
* version. If you delete this exception statement from all source
|
|
* files in the program, then also delete it here.
|
|
*/
|
|
/* copyright --> */
|
|
#include "SpeedCalc.h"
|
|
|
|
#include <algorithm>
|
|
#include <functional>
|
|
|
|
#include "wallclock.h"
|
|
|
|
namespace aria2 {
|
|
|
|
#define WINDOW_MSEC 15000
|
|
|
|
SpeedCalc::SpeedCalc()
|
|
: accumulatedLength_(0),
|
|
bytesWindow_(0),
|
|
maxSpeed_(0)
|
|
{}
|
|
|
|
void SpeedCalc::reset()
|
|
{
|
|
timeSlots_.clear();
|
|
start_ = global::wallclock();
|
|
accumulatedLength_ = 0;
|
|
bytesWindow_ = 0;
|
|
maxSpeed_ = 0;
|
|
}
|
|
|
|
void SpeedCalc::removeStaleTimeSlot(int64_t now)
|
|
{
|
|
while(!timeSlots_.empty()) {
|
|
if(now - timeSlots_[0].first <= WINDOW_MSEC) {
|
|
break;
|
|
} else {
|
|
bytesWindow_ -= timeSlots_[0].second;
|
|
timeSlots_.pop_front();
|
|
}
|
|
}
|
|
}
|
|
|
|
int SpeedCalc::calculateSpeed()
|
|
{
|
|
int64_t now = global::wallclock().getTimeInMillis();
|
|
removeStaleTimeSlot(now);
|
|
if(timeSlots_.empty()) {
|
|
return 0;
|
|
}
|
|
int64_t elapsed = now - timeSlots_[0].first;
|
|
if(elapsed <= 0) {
|
|
elapsed = 1;
|
|
}
|
|
int speed = bytesWindow_*1000/elapsed;
|
|
maxSpeed_ = std::max(speed, maxSpeed_);
|
|
return speed;
|
|
}
|
|
|
|
void SpeedCalc::update(size_t bytes)
|
|
{
|
|
int64_t now = global::wallclock().getTimeInMillis();
|
|
removeStaleTimeSlot(now);
|
|
if(timeSlots_.empty() || now/1000 != timeSlots_.back().first/1000) {
|
|
timeSlots_.push_back(std::make_pair(now, bytes));
|
|
} else {
|
|
timeSlots_.back().second += bytes;
|
|
}
|
|
bytesWindow_ += bytes;
|
|
accumulatedLength_ += bytes;
|
|
}
|
|
|
|
int SpeedCalc::calculateAvgSpeed() const
|
|
{
|
|
int64_t milliElapsed = start_.differenceInMillis(global::wallclock());
|
|
// if milliElapsed is too small, the average speed is rubish, better
|
|
// return 0
|
|
if(milliElapsed > 4) {
|
|
int speed = accumulatedLength_*1000/milliElapsed;
|
|
return speed;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
} // namespace aria2
|