pool.cpp

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// Copyright (c) 2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#include <bench/bench.h>
#include <support/allocators/pool.h>
 
#include <unordered_map>
 
template <typename Map>
void BenchFillClearMap(benchmark::Bench &bench, Map &map) {
    size_t batch_size = 5000;
 
    // make sure each iteration of the benchmark contains exactly 5000 inserts
    // and one clear.
    // do this at least 10 times so we get reasonable accurate results
 
    bench.batch(batch_size).minEpochIterations(10).run([&] {
        auto rng = ankerl::nanobench::Rng(1234);
        for (size_t i = 0; i < batch_size; ++i) {
            map[rng()];
        }
        map.clear();
    });
}
 
static void PoolAllocator_StdUnorderedMap(benchmark::Bench &bench) {
    auto map = std::unordered_map<uint64_t, uint64_t>();
    BenchFillClearMap(bench, map);
}
 
static void
PoolAllocator_StdUnorderedMapWithPoolResource(benchmark::Bench &bench) {
    using Map = std::unordered_map<
        uint64_t, uint64_t, std::hash<uint64_t>, std::equal_to<uint64_t>,
        PoolAllocator<std::pair<const uint64_t, uint64_t>,
                      sizeof(std::pair<const uint64_t, uint64_t>) +
                          4 * sizeof(void *)>>;
 
    // make sure the resource supports large enough pools to hold the node.
    // We do this by adding the size of a few pointers to it.
    auto pool_resource = Map::allocator_type::ResourceType();
    auto map = Map{0, std::hash<uint64_t>{}, std::equal_to<uint64_t>{},
                   &pool_resource};
    BenchFillClearMap(bench, map);
}
 
BENCHMARK(PoolAllocator_StdUnorderedMap);
BENCHMARK(PoolAllocator_StdUnorderedMapWithPoolResource);