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/**
* Copyright (C) 2023-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/admission/throughput_probing_gen.h"
#include "mongo/tools/workload_simulation/simulation.h"
#include "mongo/tools/workload_simulation/throughput_probing/throughput_probing_simulator.h"
#include "mongo/tools/workload_simulation/throughput_probing/ticketed_workload_driver.h"
#include "mongo/tools/workload_simulation/workload_characteristics.h"
#include "mongo/util/duration.h"
#include "mongo/util/stacktrace.h"
namespace mongo::workload_simulation {
namespace {
/**
* - Offered load exceeds optimal
* - Optimal load and throughput are moderate
* - Standard monitoring interval
*/
SIMULATION(ThroughputProbing, OverloadBasic) {
RWPair optimalConcurrency{10, 10};
RWPair throughputAtOptimalConcurrency{5'000, 5'000};
auto characteristics = std::make_unique<ParabolicWorkloadCharacteristics>(
optimalConcurrency, throughputAtOptimalConcurrency);
start(std::make_unique<TicketedWorkloadDriver>(queue(), std::move(characteristics)), 128, 128);
run(Seconds{20});
}
/**
* - Offered load exceeds optimal
* - Optimal load is moderate
* - Throughput at optimal load is quite low
* - Standard monitoring interval
*/
SIMULATION(ThroughputProbing, OverloadLowThroughput) {
RWPair optimalConcurrency{10, 10};
RWPair throughputAtOptimalConcurrency{100, 100};
auto characteristics = std::make_unique<ParabolicWorkloadCharacteristics>(
optimalConcurrency, throughputAtOptimalConcurrency);
start(std::make_unique<TicketedWorkloadDriver>(queue(), std::move(characteristics)), 128, 128);
run(Seconds{20});
}
/**
* - Offered load exceeds optimal
* - Optimal load is high
* - Throughput at optimal load is high
* - Standard monitoring interval
*/
SIMULATION(ThroughputProbing, OverloadHighConcurrency) {
RWPair optimalConcurrency{100, 100};
RWPair throughputAtOptimalConcurrency{50'000, 50'000};
auto characteristics = std::make_unique<ParabolicWorkloadCharacteristics>(
optimalConcurrency, throughputAtOptimalConcurrency);
start(std::make_unique<TicketedWorkloadDriver>(queue(), std::move(characteristics)), 128, 128);
run(Seconds{35});
}
/**
* - Offered load exceeds optimal
* - Two periods
* - For first, optimal load and throughput are moderate
* - For second, optimal load and throughput are high
* - Standard monitoring interval
*/
SIMULATION(ThroughputProbing, OverloadAdjustsUpToDifferentWorkload) {
RWPair initialOptimalConcurrency{10, 10};
RWPair initialThroughputAtOptimalConcurrency{5'000, 5'000};
auto characteristics = std::make_unique<ParabolicWorkloadCharacteristics>(
initialOptimalConcurrency, initialThroughputAtOptimalConcurrency);
auto characteristicsPtr = characteristics.get();
start(std::make_unique<TicketedWorkloadDriver>(queue(), std::move(characteristics)), 128, 128);
run(Seconds{20});
// Change the workload so optimal is significantly higher than before.
RWPair updatedOptimalConcurrency{100, 100};
RWPair updatedThroughputAtOptimalConcurrency{50'000, 50'000};
characteristicsPtr->reset(updatedOptimalConcurrency, updatedThroughputAtOptimalConcurrency);
run(Seconds{35});
}
/**
* - Offered load exceeds optimal
* - Two periods
* - For first, optimal load and throughput are moderately high
* - For second, optimal load and throughput are half that in the first period
* - Standard monitoring interval
*/
SIMULATION(ThroughputProbing, OverloadDoesNotAdjustDownToDifferentWorkload) {
RWPair initialOptimalConcurrency{20, 20};
RWPair initialThroughputAtOptimalConcurrency{20'000, 20'000};
auto characteristics = std::make_unique<ParabolicWorkloadCharacteristics>(
initialOptimalConcurrency, initialThroughputAtOptimalConcurrency);
auto characteristicsPtr = characteristics.get();
start(std::make_unique<TicketedWorkloadDriver>(queue(), std::move(characteristics)), 128, 128);
run(Seconds{20});
// Change the workload so optimal is half what it was before.
RWPair updatedOptimalConcurrency{10, 10};
RWPair updatedThroughputAtOptimalConcurrency{10'000, 10'000};
characteristicsPtr->reset(updatedOptimalConcurrency, updatedThroughputAtOptimalConcurrency);
run(Seconds{20});
}
/**
* - Offered load does not exceed optimal
* - Optimal load and throughput are moderate
* - Standard monitoring interval
*/
SIMULATION(ThroughputProbing, StableBasic) {
RWPair optimalConcurrency{20, 20};
RWPair throughputAtOptimalConcurrency{5'000, 5'000};
auto characteristics = std::make_unique<ParabolicWorkloadCharacteristics>(
optimalConcurrency, throughputAtOptimalConcurrency);
RWPair providedLoad{10, 10};
start(std::make_unique<TicketedWorkloadDriver>(queue(), std::move(characteristics)),
providedLoad.read,
providedLoad.write);
run(Seconds{20});
}
/**
* - Offered load does not exceed optimal at any point
* - Optimal load and throughput are moderate
* - Two periods
* - For first, offered load is low
* - For second, offered load increases by 50%
* - Standard monitoring interval
*/
SIMULATION(ThroughputProbing, StableAdjustsUpToProvidedLoad) {
RWPair optimalConcurrency{20, 20};
RWPair throughputAtOptimalConcurrency{5'000, 5'000};
auto characteristics = std::make_unique<ParabolicWorkloadCharacteristics>(
optimalConcurrency, throughputAtOptimalConcurrency);
RWPair initialProvidedLoad{10, 10};
start(std::make_unique<TicketedWorkloadDriver>(queue(), std::move(characteristics)),
initialProvidedLoad.read,
initialProvidedLoad.write);
run(Seconds{20});
// Increase offered load by 50%, but keep it under optimal level.
RWPair higherProvidedLoad{15, 15};
resize(higherProvidedLoad.read, higherProvidedLoad.write);
run(Seconds(20));
}
} // namespace
} // namespace mongo::workload_simulation
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