128 lines
3.0 KiB
C++
128 lines
3.0 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2022
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include "memprof/memprof.h"
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#include "td/utils/check.h"
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#include "td/utils/Slice.h"
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#include "td/utils/FlatHashMap.h"
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#include "td/utils/format.h"
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#include "td/utils/UInt.h"
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#include <folly/container/F14Map.h>
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#include <absl/container/flat_hash_map.h>
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#include <map>
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#include <unordered_map>
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template <class T>
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class Generator {
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public:
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T next() {
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UNREACHABLE();
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}
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};
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template <class T>
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class IntGenerator {
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public:
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T next() {
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return ++value;
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}
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private:
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T value{};
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};
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template <>
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class Generator<uint32_t> : public IntGenerator<uint32_t> {
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public:
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};
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template <>
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class Generator<uint64_t> : public IntGenerator<uint64_t> {
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public:
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};
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template <class T, class KeyT, class ValueT>
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void measure(td::StringBuilder &sb, td::Slice name, td::Slice key_name, td::Slice value_name) {
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sb << name << "<" << key_name << "," << value_name << ">:\n";
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size_t ideal_size = sizeof(KeyT) + sizeof(ValueT);
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sb << "\tempty:" << sizeof(T);
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struct Stat {
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int pi;
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double min_ratio;
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double max_ratio;
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};
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std::vector<Stat> stat;
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stat.reserve(1024);
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for (size_t size : {10000000u}) {
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Generator<KeyT> key_generator;
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auto start_mem = get_used_memory_size();
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T ht;
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auto ratio = [&]() {
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auto end_mem = get_used_memory_size();
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auto used_mem = end_mem - start_mem;
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return double(used_mem) / double(ideal_size * ht.size());
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};
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double min_ratio;
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double max_ratio;
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auto reset = [&]() {
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min_ratio = 1e100;
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max_ratio = 0;
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};
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auto update = [&]() {
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auto x = ratio();
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min_ratio = std::min(min_ratio, x);
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max_ratio = std::max(max_ratio, x);
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if (x > 14) {
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LOG(ERROR) << "WTF";
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}
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};
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reset();
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int p = 10;
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int pi = 1;
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for (size_t i = 0; i < size; i++) {
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ht.emplace(key_generator.next(), ValueT{});
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update();
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if ((i + 1) % p == 0) {
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stat.emplace_back(Stat{pi, min_ratio, max_ratio});
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reset();
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pi++;
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p *= 10;
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}
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}
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}
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for (auto &s : stat) {
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sb << " " << 10 << "^" << s.pi << ":" << s.min_ratio << "->" << s.max_ratio;
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}
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sb << "\n";
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}
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template <template<typename... Args> class T>
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void print_memory_stats(td::Slice name) {
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std::string big_buff(1<<16, '\0');
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td::StringBuilder sb(big_buff, false);
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#define MEASURE(KeyT, ValueT) \
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measure<T<KeyT, ValueT>, KeyT, ValueT>(sb, name, #KeyT, #ValueT);
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MEASURE(uint32_t, uint32_t)
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// MEASURE(uint64_t, td::UInt256)
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LOG(ERROR) << "\n" << sb.as_cslice();
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}
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#define FOR_EACH_TABLE(F) \
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F(td::FlatHashMapImpl) \
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F(folly::F14FastMap) \
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F(absl::flat_hash_map) \
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F(std::unordered_map) \
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F(std::map)
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#define BENCH_MEMORY(T) print_memory_stats<T>(#T);
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int main() {
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CHECK(get_used_memory_size());
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FOR_EACH_TABLE(BENCH_MEMORY);
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return 0;
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} |