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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 <benchmark/benchmark.h>
#include "mongo/db/database_name.h"
#include "mongo/db/namespace_string.h"
#include "mongo/util/immutable/map.h"
#include "mongo/util/immutable/unordered_map.h"
namespace mongo {
namespace {
constexpr StringData kMapCollName = "CollName"_sd;
constexpr size_t kSmallSize = 8; // Under the small-string optimization limit
constexpr size_t kLongSize = 32; // Over the small string optimization limit
DatabaseName makeDB(StringData db) {
return DatabaseName::createDatabaseName_forTest(boost::none, db);
}
NamespaceString makeNS(StringData db, StringData coll) {
return NamespaceString::createNamespaceString_forTest(db, coll);
}
template <typename T>
auto discardValue(T&& x) {
return std::forward<T>(x);
}
std::string makePaddedString(const int i, const size_t sz) {
std::string r = std::to_string(i);
return std::string(sz - r.size(), 'x') + r;
}
std::vector<std::pair<DatabaseName, std::shared_ptr<int>>> createDataVectorForMap() {
std::vector<std::pair<DatabaseName, std::shared_ptr<int>>> data;
for (int i = 0; i < 50; ++i) {
data.emplace_back(makeDB(makePaddedString(i, kSmallSize)), std::make_shared<int>(i));
}
for (int i = 0; i < 50; ++i) {
data.emplace_back(makeDB(makePaddedString(i, kLongSize)), std::make_shared<int>(i));
}
return data;
}
} // namespace
void BM_NamespaceStringCreation(benchmark::State& state) {
const StringData dbName =
"ThisIsAVeryLongDatabaseNameThatIDontCareAboutAndPerhapsTheGetty"_sd.substr(0,
state.range(0));
const StringData collName = "COL"_sd;
for (auto _ : state) {
benchmark::DoNotOptimize(makeNS(dbName, collName));
}
}
void BM_CreateShortNsFromConstexpr(benchmark::State& state) {
for (auto _ : state) {
benchmark::DoNotOptimize(NamespaceString(NamespaceString::kRsOplogNamespace));
}
}
void BM_CreateLongNsFromConstexpr(benchmark::State& state) {
for (auto _ : state) {
benchmark::DoNotOptimize(
NamespaceString(NamespaceString::kReshardingTxnClonerProgressNamespace));
}
}
void BM_NamespaceStringShortDbName(benchmark::State& state) {
const auto dbName = "short"_sd;
NamespaceString ns = makeNS(dbName, kMapCollName);
for (auto _ : state) {
benchmark::DoNotOptimize(ns.dbName());
}
}
void BM_NamespaceStringLongDbName(benchmark::State& state) {
const std::string dbName(60, 'x');
NamespaceString ns = makeNS(dbName, kMapCollName);
for (auto _ : state) {
benchmark::DoNotOptimize(ns.dbName());
}
}
void searchInMap(benchmark::State& state, const NamespaceString& ns) {
immutable::map<DatabaseName, std::shared_ptr<int>> dbMap;
auto data = createDataVectorForMap();
for (auto& pair : data) {
dbMap = dbMap.insert(std::move(pair.first), std::move(pair.second));
}
for (auto _ : state) {
benchmark::DoNotOptimize(discardValue(dbMap.find(ns.dbName())));
}
}
void BM_NamespaceStringShortDbNameMapLookupExist(benchmark::State& state) {
searchInMap(state, makeNS(makePaddedString(12, kSmallSize), kMapCollName));
}
void BM_NamespaceStringLongDbNameMapLookupExist(benchmark::State& state) {
searchInMap(state, makeNS(makePaddedString(34, kLongSize), kMapCollName));
}
void BM_NamespaceStringDbNameMapLookupDoesntExist(benchmark::State& state) {
searchInMap(state, makeNS("DbNameMissing", kMapCollName));
}
void searchInUnorderedMap(benchmark::State& state, const NamespaceString& ns) {
auto data = createDataVectorForMap();
immutable::unordered_map<DatabaseName, std::shared_ptr<int>> dbMap{data.begin(), data.end()};
for (auto _ : state) {
benchmark::DoNotOptimize(discardValue(dbMap.find(ns.dbName())));
}
}
void BM_NamespaceStringShortDbNameUnorderedMapLookupExist(benchmark::State& state) {
searchInUnorderedMap(state, makeNS(makePaddedString(45, kSmallSize), kMapCollName));
}
void BM_NamespaceStringLongDbNameUnorderedMapLookupExist(benchmark::State& state) {
searchInUnorderedMap(state, makeNS(makePaddedString(5, kLongSize), kMapCollName));
}
void BM_NamespaceStringDbNameUnorderedMapLookupDoesntExist(benchmark::State& state) {
searchInUnorderedMap(state, makeNS("LongDatabaseNameThatIsNotInTheMap", kMapCollName));
}
BENCHMARK(BM_NamespaceStringCreation)->DenseRange(1, 63);
BENCHMARK(BM_CreateShortNsFromConstexpr);
BENCHMARK(BM_CreateLongNsFromConstexpr);
BENCHMARK(BM_NamespaceStringShortDbName);
BENCHMARK(BM_NamespaceStringLongDbName);
BENCHMARK(BM_NamespaceStringShortDbNameMapLookupExist);
BENCHMARK(BM_NamespaceStringLongDbNameMapLookupExist);
BENCHMARK(BM_NamespaceStringDbNameMapLookupDoesntExist);
BENCHMARK(BM_NamespaceStringShortDbNameUnorderedMapLookupExist);
BENCHMARK(BM_NamespaceStringLongDbNameUnorderedMapLookupExist);
BENCHMARK(BM_NamespaceStringDbNameUnorderedMapLookupDoesntExist);
} // namespace mongo
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