Bitcoin Core  27.99.0
P2P Digital Currency
pool.cpp
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1 // Copyright (c) 2022 The Bitcoin Core developers
2 // Distributed under the MIT software license, see the accompanying
3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 
5 #include <bench/bench.h>
7 
8 #include <unordered_map>
9 
10 template <typename Map>
11 void BenchFillClearMap(benchmark::Bench& bench, Map& map)
12 {
13  size_t batch_size = 5000;
14 
15  // make sure each iteration of the benchmark contains exactly 5000 inserts and one clear.
16  // do this at least 10 times so we get reasonable accurate results
17 
18  bench.batch(batch_size).minEpochIterations(10).run([&] {
19  auto rng = ankerl::nanobench::Rng(1234);
20  for (size_t i = 0; i < batch_size; ++i) {
21  map[rng()];
22  }
23  map.clear();
24  });
25 }
26 
28 {
29  auto map = std::unordered_map<uint64_t, uint64_t>();
30  BenchFillClearMap(bench, map);
31 }
32 
34 {
35  using Map = std::unordered_map<uint64_t,
36  uint64_t,
37  std::hash<uint64_t>,
38  std::equal_to<uint64_t>,
40  sizeof(std::pair<const uint64_t, uint64_t>) + 4 * sizeof(void*)>>;
41 
42  // 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.
43  auto pool_resource = Map::allocator_type::ResourceType();
44  auto map = Map{0, std::hash<uint64_t>{}, std::equal_to<uint64_t>{}, &pool_resource};
45  BenchFillClearMap(bench, map);
46 }
47 
Forwards all allocations/deallocations to the PoolResource.
Definition: pool.h:277
Main entry point to nanobench's benchmarking facility.
Definition: nanobench.h:627
Bench & run(char const *benchmarkName, Op &&op)
Repeatedly calls op() based on the configuration, and performs measurements.
Definition: nanobench.h:1234
Bench & batch(T b) noexcept
Sets the batch size.
Definition: nanobench.h:1258
ANKERL_NANOBENCH(NODISCARD) std Bench & minEpochIterations(uint64_t numIters) noexcept
Sets the minimum number of iterations each epoch should take.
An extremely fast random generator.
Definition: nanobench.h:488
@ HIGH
Definition: bench.h:47
void BenchFillClearMap(benchmark::Bench &bench, Map &map)
Definition: pool.cpp:11
static void PoolAllocator_StdUnorderedMapWithPoolResource(benchmark::Bench &bench)
Definition: pool.cpp:33
BENCHMARK(PoolAllocator_StdUnorderedMap, benchmark::PriorityLevel::HIGH)
static void PoolAllocator_StdUnorderedMap(benchmark::Bench &bench)
Definition: pool.cpp:27