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// Benchmark: glz::generic (ordered_small_map) vs glz::generic with std::map
// Tests read_json, write_json, and key lookup performance
#include <map>
#include <string>
#include "bencher/bencher.hpp"
#include "bencher/diagnostics.hpp"
#include "glaze/json.hpp"
// User-defined std::map adapter for generic_json
template <class T>
using std_map = std::map<std::string, T, std::less<>>;
using generic_default = glz::generic; // ordered_small_map
using generic_std_map = glz::generic_json<glz::num_mode::f64, std_map>;
// Small JSON object (8 keys)
inline const std::string small_json = R"({
"id": 12345,
"name": "Alice Smith",
"email": "alice@example.com",
"age": 30,
"active": true,
"score": 98.5,
"role": "admin",
"verified": false
})";
// Medium JSON object (nested, ~20 keys total)
inline const std::string medium_json = R"({
"user": {
"id": 12345,
"name": "Alice Smith",
"email": "alice@example.com",
"age": 30,
"active": true
},
"settings": {
"theme": "dark",
"language": "en",
"notifications": true,
"timezone": "UTC",
"currency": "USD"
},
"scores": [95, 87, 92, 88, 91],
"metadata": {
"created": "2024-01-15",
"updated": "2024-06-20",
"version": 3,
"source": "api",
"format": "json"
},
"tags": ["premium", "verified", "active"]
})";
// Generate a large JSON array of objects
inline std::string generate_large_json(size_t count)
{
std::string json = R"({"users":[)";
for (size_t i = 0; i < count; ++i) {
if (i > 0) json += ",";
json += R"({"id":)";
json += std::to_string(i);
json += R"(,"name":"User )";
json += std::to_string(i);
json += R"(","email":"user)";
json += std::to_string(i);
json += R"(@test.com","age":)";
json += std::to_string(20 + (i % 50));
json += R"(,"active":)";
json += (i % 2 == 0) ? "true" : "false";
json += R"(,"score":)";
json += std::to_string(i * 10);
json += "}";
}
json += R"(],"count":)";
json += std::to_string(count);
json += "}";
return json;
}
int main()
{
const auto large_json = generate_large_json(100);
// ========================================================================
// Benchmark: read_json (small object)
// ========================================================================
{
bencher::stage stage;
stage.name = "read_json (small, 8 keys)";
stage.run("ordered_small_map", [&] {
generic_default json{};
auto ec = glz::read_json(json, small_json);
if (ec) std::abort();
bencher::do_not_optimize(json);
return small_json.size();
});
stage.run("std::map", [&] {
generic_std_map json{};
auto ec = glz::read_json(json, small_json);
if (ec) std::abort();
bencher::do_not_optimize(json);
return small_json.size();
});
bencher::print_results(stage);
}
// ========================================================================
// Benchmark: read_json (medium object)
// ========================================================================
{
bencher::stage stage;
stage.name = "read_json (medium, nested)";
stage.run("ordered_small_map", [&] {
generic_default json{};
auto ec = glz::read_json(json, medium_json);
if (ec) std::abort();
bencher::do_not_optimize(json);
return medium_json.size();
});
stage.run("std::map", [&] {
generic_std_map json{};
auto ec = glz::read_json(json, medium_json);
if (ec) std::abort();
bencher::do_not_optimize(json);
return medium_json.size();
});
bencher::print_results(stage);
}
// ========================================================================
// Benchmark: read_json (large, 100 objects)
// ========================================================================
{
bencher::stage stage;
stage.name = "read_json (large, 100 objects)";
stage.run("ordered_small_map", [&] {
generic_default json{};
auto ec = glz::read_json(json, large_json);
if (ec) std::abort();
bencher::do_not_optimize(json);
return large_json.size();
});
stage.run("std::map", [&] {
generic_std_map json{};
auto ec = glz::read_json(json, large_json);
if (ec) std::abort();
bencher::do_not_optimize(json);
return large_json.size();
});
bencher::print_results(stage);
}
// ========================================================================
// Benchmark: write_json (small object)
// ========================================================================
{
generic_default json_default{};
glz::read_json(json_default, small_json);
generic_std_map json_stdmap{};
glz::read_json(json_stdmap, small_json);
bencher::stage stage;
stage.name = "write_json (small, 8 keys)";
stage.run("ordered_small_map", [&] {
std::string out{};
auto ec = glz::write_json(json_default, out);
if (ec) std::abort();
bencher::do_not_optimize(out);
return out.size();
});
stage.run("std::map", [&] {
std::string out{};
auto ec = glz::write_json(json_stdmap, out);
if (ec) std::abort();
bencher::do_not_optimize(out);
return out.size();
});
bencher::print_results(stage);
}
// ========================================================================
// Benchmark: write_json (small, reused buffer)
// ========================================================================
{
generic_default json_default{};
glz::read_json(json_default, small_json);
generic_std_map json_stdmap{};
glz::read_json(json_stdmap, small_json);
std::string out_default, out_stdmap;
out_default.reserve(512);
out_stdmap.reserve(512);
bencher::stage stage;
stage.name = "write_json (small, 8 keys, reused buffer)";
stage.cold_cache = false;
stage.run("ordered_small_map", [&] {
out_default.clear();
auto ec = glz::write_json(json_default, out_default);
if (ec) std::abort();
bencher::do_not_optimize(out_default);
return out_default.size();
});
stage.run("std::map", [&] {
out_stdmap.clear();
auto ec = glz::write_json(json_stdmap, out_stdmap);
if (ec) std::abort();
bencher::do_not_optimize(out_stdmap);
return out_stdmap.size();
});
bencher::print_results(stage);
}
// ========================================================================
// Benchmark: write_json (medium object)
// ========================================================================
{
generic_default json_default{};
glz::read_json(json_default, medium_json);
generic_std_map json_stdmap{};
glz::read_json(json_stdmap, medium_json);
bencher::stage stage;
stage.name = "write_json (medium, nested)";
stage.run("ordered_small_map", [&] {
std::string out{};
auto ec = glz::write_json(json_default, out);
if (ec) std::abort();
bencher::do_not_optimize(out);
return out.size();
});
stage.run("std::map", [&] {
std::string out{};
auto ec = glz::write_json(json_stdmap, out);
if (ec) std::abort();
bencher::do_not_optimize(out);
return out.size();
});
bencher::print_results(stage);
}
// ========================================================================
// Benchmark: write_json (medium, reused buffer)
// ========================================================================
{
generic_default json_default{};
glz::read_json(json_default, medium_json);
generic_std_map json_stdmap{};
glz::read_json(json_stdmap, medium_json);
std::string out_default, out_stdmap;
out_default.reserve(512);
out_stdmap.reserve(512);
bencher::stage stage;
stage.name = "write_json (medium, nested, reused buffer)";
stage.cold_cache = false;
stage.run("ordered_small_map", [&] {
out_default.clear();
auto ec = glz::write_json(json_default, out_default);
if (ec) std::abort();
bencher::do_not_optimize(out_default);
return out_default.size();
});
stage.run("std::map", [&] {
out_stdmap.clear();
auto ec = glz::write_json(json_stdmap, out_stdmap);
if (ec) std::abort();
bencher::do_not_optimize(out_stdmap);
return out_stdmap.size();
});
bencher::print_results(stage);
}
// ========================================================================
// Benchmark: Key lookup (operator[])
// ========================================================================
{
generic_default json_default{};
glz::read_json(json_default, small_json);
generic_std_map json_stdmap{};
glz::read_json(json_stdmap, small_json);
bencher::stage stage;
stage.name = "Key lookup (8 keys, access all)";
stage.run("ordered_small_map", [&] {
double sum = 0;
sum += json_default["id"].get<double>();
sum += json_default["age"].get<double>();
sum += json_default["score"].get<double>();
sum += json_default["active"].get<bool>() ? 1.0 : 0.0;
bencher::do_not_optimize(sum);
return 4 * sizeof(double);
});
stage.run("std::map", [&] {
double sum = 0;
sum += json_stdmap["id"].get<double>();
sum += json_stdmap["age"].get<double>();
sum += json_stdmap["score"].get<double>();
sum += json_stdmap["active"].get<bool>() ? 1.0 : 0.0;
bencher::do_not_optimize(sum);
return 4 * sizeof(double);
});
bencher::print_results(stage);
}
// ========================================================================
// Benchmark: Roundtrip (read + write)
// ========================================================================
{
bencher::stage stage;
stage.name = "Roundtrip read+write (medium)";
stage.run("ordered_small_map", [&] {
generic_default json{};
auto ec = glz::read_json(json, medium_json);
if (ec) std::abort();
std::string out{};
auto ec2 = glz::write_json(json, out);
if (ec2) std::abort();
bencher::do_not_optimize(out);
return medium_json.size() + out.size();
});
stage.run("std::map", [&] {
generic_std_map json{};
auto ec = glz::read_json(json, medium_json);
if (ec) std::abort();
std::string out{};
auto ec2 = glz::write_json(json, out);
if (ec2) std::abort();
bencher::do_not_optimize(out);
return medium_json.size() + out.size();
});
bencher::print_results(stage);
}
return 0;
}
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