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/**
* Copyright (C) 2022-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. 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 in the license file.
*/
#include "mongo/db/query/cost_model/cost_model_manager.h"
#include "mongo/db/query/cost_model/cost_model_on_update.h"
namespace mongo::cost_model {
namespace {
/**
* Populate given cost model coefficients object with default values.
*/
void initializeCoefficients(CostModelCoefficients& coefficients) {
// These cost should reflect estimated aggregated execution time in milliseconds.
// The coeffeicient ns converts values from nanoseconds to milliseconds.
constexpr double nsToMs = 1.0e-6;
coefficients.setDefaultStartupCost(1.0 * nsToMs);
coefficients.setScanIncrementalCost(422.31145989 * nsToMs);
coefficients.setScanStartupCost(6175.527218993269 * nsToMs);
coefficients.setIndexScanIncrementalCost(403.68075869 * nsToMs);
coefficients.setIndexScanStartupCost(14054.983953111061 * nsToMs);
coefficients.setSeekCost(1174.84136356 * nsToMs);
coefficients.setSeekStartupCost(7488.662376624863 * nsToMs);
coefficients.setFilterIncrementalCost(83.7274685 * nsToMs);
coefficients.setFilterStartupCost(1461.3148783443378 * nsToMs);
coefficients.setEvalIncrementalCost(430.6176946 * nsToMs);
coefficients.setEvalStartupCost(1103.4048573163343 * nsToMs);
coefficients.setGroupByIncrementalCost(413.07932374 * nsToMs);
coefficients.setGroupByStartupCost(1199.8878012735659 * nsToMs);
coefficients.setUnwindIncrementalCost(586.57200195 * nsToMs);
coefficients.setUnwindStartupCost(1.0 * nsToMs);
coefficients.setBinaryJoinIncrementalCost(161.62301944 * nsToMs);
coefficients.setBinaryJoinStartupCost(402.8455479458652 * nsToMs);
coefficients.setHashJoinIncrementalCost(250.61365634 * nsToMs);
coefficients.setHashJoinStartupCost(1.0 * nsToMs); // Already calibrated.
coefficients.setMergeJoinIncrementalCost(111.23423304 * nsToMs);
coefficients.setMergeJoinStartupCost(1517.7970800404169 * nsToMs);
coefficients.setUniqueIncrementalCost(269.71368614 * nsToMs);
coefficients.setUniqueStartupCost(1.0 * nsToMs); // Already calibrated.
coefficients.setCollationIncrementalCost(2500 * nsToMs); // TODO: not yet calibrated
coefficients.setCollationStartupCost(1.0 * nsToMs); // TODO: not yet calibrated
coefficients.setCollationWithLimitIncrementalCost(1000 * nsToMs); // TODO: not yet calibrated
coefficients.setCollationWithLimitStartupCost(1.0 * nsToMs); // TODO: not yet calibrated
coefficients.setUnionIncrementalCost(111.94945268 * nsToMs);
coefficients.setUnionStartupCost(69.88096657391543 * nsToMs);
coefficients.setExchangeIncrementalCost(100 * nsToMs); // TODO: not yet calibrated
coefficients.setExchangeStartupCost(1.0 * nsToMs); // TODO: not yet calibrated
coefficients.setLimitSkipIncrementalCost(62.42111111 * nsToMs);
coefficients.setLimitSkipStartupCost(655.1342592592522 * nsToMs);
}
} // namespace
CostModelManager::CostModelManager() {
initializeCoefficients(_coefficients);
}
CostModelCoefficients CostModelManager::getCoefficients() const {
std::shared_lock rLock(_mutex); // NOLINT
return _coefficients;
}
CostModelCoefficients CostModelManager::getDefaultCoefficients() {
CostModelCoefficients defaultCoefs;
initializeCoefficients(defaultCoefs);
return defaultCoefs;
}
void CostModelManager::updateCostModelCoefficients(const BSONObj& overrides) {
CostModelCoefficients newCoefs;
if (overrides.isEmpty()) {
initializeCoefficients(newCoefs);
} else {
auto coefsObj = _coefficients.toBSON();
newCoefs = CostModelCoefficients::parse(IDLParserContext{"CostModelCoefficients"},
coefsObj.addFields(overrides));
}
stdx::unique_lock wLock(_mutex);
_coefficients = std::move(newCoefs);
}
} // namespace mongo::cost_model
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