123 lines
3.1 KiB
C++
123 lines
3.1 KiB
C++
/*
|
|
|
|
DISKSPD
|
|
|
|
Copyright(c) Microsoft Corporation
|
|
All rights reserved.
|
|
|
|
MIT License
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files (the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights
|
|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
copies of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in all
|
|
copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
SOFTWARE.
|
|
|
|
*/
|
|
|
|
#include "ThroughputMeter.h"
|
|
|
|
ThroughputMeter::ThroughputMeter(void) :
|
|
_fRunning(false)
|
|
{
|
|
}
|
|
|
|
bool ThroughputMeter::IsRunning(void) const
|
|
{
|
|
return _fRunning;
|
|
}
|
|
|
|
void ThroughputMeter::Start(DWORD cBytesPerMillisecond, DWORD dwBlockSize, DWORD dwThinkTime, DWORD dwBurstSize)
|
|
{
|
|
// Initialization
|
|
_cbCompleted = 0;
|
|
_cIO = 0; // number of completed IOs in the current burst
|
|
_cbBlockSize = dwBlockSize;
|
|
|
|
_fThrottle = false;
|
|
_cBytesPerMillisecond = 0;
|
|
_fThink = false;
|
|
_ullDelayUntil = 0;
|
|
_thinkTime = 0;
|
|
_burstSize = 0;
|
|
_fRunning = false;
|
|
|
|
/// GetTickCount64 -> GetTickCount
|
|
_ullStartTimestamp = GetTickCount();
|
|
|
|
if (0 != cBytesPerMillisecond)
|
|
{
|
|
_fThrottle = true;
|
|
_cBytesPerMillisecond = cBytesPerMillisecond;
|
|
_fRunning = true;
|
|
}
|
|
else if (0 != dwThinkTime)
|
|
{
|
|
_fThink = true;
|
|
_thinkTime = dwThinkTime;
|
|
_burstSize = dwBurstSize;
|
|
_fRunning = true;
|
|
}
|
|
}
|
|
|
|
DWORD ThroughputMeter::GetSleepTime(void) const
|
|
{
|
|
if (_fThink)
|
|
{
|
|
/// GetTickCount64 -> GetTickCount
|
|
ULONGLONG ullTimestamp = GetTickCount();
|
|
if (ullTimestamp < _ullDelayUntil)
|
|
{
|
|
return (DWORD)(_ullDelayUntil - ullTimestamp);
|
|
}
|
|
else
|
|
{
|
|
return (_fThrottle) ? _GetThrottleTime() : 0;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (_fThrottle) // think time has not been specified only check for throttling
|
|
{
|
|
return _GetThrottleTime();
|
|
}
|
|
else
|
|
{
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
DWORD ThroughputMeter::_GetThrottleTime(void) const
|
|
{
|
|
/// GetTickCount64 -> GetTickCount
|
|
ULONGLONG cbExpected = (GetTickCount() - _ullStartTimestamp) * _cBytesPerMillisecond;
|
|
return cbExpected >= (_cbCompleted + _cbBlockSize) ? 0 : 1;
|
|
}
|
|
|
|
void ThroughputMeter::Adjust(size_t cb)
|
|
{
|
|
_cbCompleted += cb;
|
|
_cIO++;
|
|
if (_fThink)
|
|
{
|
|
if (_cIO >= _burstSize)
|
|
{
|
|
_cIO = 0;
|
|
/// GetTickCount64 -> GetTickCount
|
|
_ullDelayUntil = GetTickCount() + _thinkTime;
|
|
}
|
|
}
|
|
} |