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