61 lines
2.4 KiB
C++
61 lines
2.4 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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#pragma once
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#include <Windows.h>
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// ThroughputMeter class assists in metering out throughput over
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// time. The meter is started by calling Start() with the throughput
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// to be simulated. GetSleepTime() returns 0 when the next IO can be issued.
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// Adjust() is called to notify the ThroughputMeter about how many bytes were read/written.
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class ThroughputMeter
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{
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public:
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ThroughputMeter(void);
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bool IsRunning(void) const;
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void Start(DWORD cBytesPerMillisecond, DWORD dwBlockSize, DWORD dwThinkTime, DWORD dwBurstSize);
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DWORD GetSleepTime(void) const;
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void Adjust(size_t cb);
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private:
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DWORD _GetThrottleTime(void) const;
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bool _fRunning; // true = throughput monitoring is on
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bool _fThrottle; // true = throttling is on
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bool _fThink; // true = think time is enabled
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ULONGLONG _cbCompleted; // completed IO
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DWORD _cbBlockSize;
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DWORD _cBytesPerMillisecond; // rate of throttling
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ULONGLONG _ullStartTimestamp;
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ULONGLONG _ullDelayUntil; // timestamp at which the next IO can be executed
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DWORD _thinkTime; // time to sleep between burst of IOs
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DWORD _burstSize; // number of IOs in a burst. meaningless if think time is zero
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DWORD _cIO; // count of IOs in the current burst
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}; |