benchmarks/src/benchmarks.cpp

#include "benchmark/benchmark.h"
#include <nlohmann/json.hpp>
#include <fstream>

using json = nlohmann::json;

//////////////////////////////////////////////////////////////////////////////
// parse JSON from file
//////////////////////////////////////////////////////////////////////////////

static void ParseFile(benchmark::State& state, const char* filename)
{
    while (state.KeepRunning())
    {
        state.PauseTiming();
        auto* f = new std::ifstream(filename);
        auto* j = new json();
        state.ResumeTiming();

        *j = json::parse(*f);

        state.PauseTiming();
        delete f;
        delete j;
        state.ResumeTiming();
    }

    std::ifstream file(filename, std::ios::binary | std::ios::ate);
    state.SetBytesProcessed(state.iterations() * file.tellg());
}
BENCHMARK_CAPTURE(ParseFile, jeopardy,      "data/jeopardy/jeopardy.json");
BENCHMARK_CAPTURE(ParseFile, canada,        "data/nativejson-benchmark/canada.json");
BENCHMARK_CAPTURE(ParseFile, citm_catalog,  "data/nativejson-benchmark/citm_catalog.json");
BENCHMARK_CAPTURE(ParseFile, twitter,       "data/nativejson-benchmark/twitter.json");
BENCHMARK_CAPTURE(ParseFile, floats,        "data/numbers/floats.json");
BENCHMARK_CAPTURE(ParseFile, signed_ints,   "data/numbers/signed_ints.json");
BENCHMARK_CAPTURE(ParseFile, unsigned_ints, "data/numbers/unsigned_ints.json");


//////////////////////////////////////////////////////////////////////////////
// parse JSON from string
//////////////////////////////////////////////////////////////////////////////

static void ParseString(benchmark::State& state, const char* filename)
{
    std::ifstream f(filename);
    std::string str((std::istreambuf_iterator<char>(f)), std::istreambuf_iterator<char>());

    while (state.KeepRunning())
    {
        state.PauseTiming();
        auto* j = new json();
        state.ResumeTiming();

        *j = json::parse(str);

        state.PauseTiming();
        delete j;
        state.ResumeTiming();
    }

    state.SetBytesProcessed(state.iterations() * str.size());
}
BENCHMARK_CAPTURE(ParseString, jeopardy,      "data/jeopardy/jeopardy.json");
BENCHMARK_CAPTURE(ParseString, canada,        "data/nativejson-benchmark/canada.json");
BENCHMARK_CAPTURE(ParseString, citm_catalog,  "data/nativejson-benchmark/citm_catalog.json");
BENCHMARK_CAPTURE(ParseString, twitter,       "data/nativejson-benchmark/twitter.json");
BENCHMARK_CAPTURE(ParseString, floats,        "data/numbers/floats.json");
BENCHMARK_CAPTURE(ParseString, signed_ints,   "data/numbers/signed_ints.json");
BENCHMARK_CAPTURE(ParseString, unsigned_ints, "data/numbers/unsigned_ints.json");


//////////////////////////////////////////////////////////////////////////////
// serialize JSON
//////////////////////////////////////////////////////////////////////////////

static void Dump(benchmark::State& state, const char* filename, int indent)
{
    std::ifstream f(filename);
    std::string str((std::istreambuf_iterator<char>(f)), std::istreambuf_iterator<char>());
    json j = json::parse(str);

    while (state.KeepRunning())
    {
        j.dump(indent);
    }

    state.SetBytesProcessed(state.iterations() * j.dump(indent).size());
}
BENCHMARK_CAPTURE(Dump, jeopardy / -,      "data/jeopardy/jeopardy.json",                 -1);
BENCHMARK_CAPTURE(Dump, jeopardy / 4,      "data/jeopardy/jeopardy.json",                 4);
BENCHMARK_CAPTURE(Dump, canada / -,        "data/nativejson-benchmark/canada.json",       -1);
BENCHMARK_CAPTURE(Dump, canada / 4,        "data/nativejson-benchmark/canada.json",       4);
BENCHMARK_CAPTURE(Dump, citm_catalog / -,  "data/nativejson-benchmark/citm_catalog.json", -1);
BENCHMARK_CAPTURE(Dump, citm_catalog / 4,  "data/nativejson-benchmark/citm_catalog.json", 4);
BENCHMARK_CAPTURE(Dump, twitter / -,       "data/nativejson-benchmark/twitter.json",      -1);
BENCHMARK_CAPTURE(Dump, twitter / 4,       "data/nativejson-benchmark/twitter.json",      4);
BENCHMARK_CAPTURE(Dump, floats / -,        "data/numbers/floats.json",                    -1);
BENCHMARK_CAPTURE(Dump, floats / 4,        "data/numbers/floats.json",                    4);
BENCHMARK_CAPTURE(Dump, signed_ints / -,   "data/numbers/signed_ints.json",               -1);
BENCHMARK_CAPTURE(Dump, signed_ints / 4,   "data/numbers/signed_ints.json",               4);
BENCHMARK_CAPTURE(Dump, unsigned_ints / -, "data/numbers/unsigned_ints.json",             -1);
BENCHMARK_CAPTURE(Dump, unsigned_ints / 4, "data/numbers/unsigned_ints.json",             4);


BENCHMARK_MAIN();