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json/tests/benchmarks/src/benchmarks.cpp
Niels Lohmann c8ee344008 Benchmark json_document 
benchmarks_view.cpp adds ViewParse, ViewRead (a reused document),
ViewParseIndented, ViewAccept, and ViewMaterialize on the files of
ParseString, so that each row can be read against the json::parse row of
the same file; benchmarks.cpp gains Accept (json::accept) as the
counterpart of ViewAccept. The view benchmarks are built only if the
header directory has json_view.hpp, so that older versions can still be
benchmarked.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
2026-09-29 14:02:44 +02:00

617 lines
27 KiB
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// __ _____ _____ _____
// __| | __| | | | JSON for Modern C++ (supporting code)
// | | |__ | | | | | | version 3.12.0
// |_____|_____|_____|_|___| https://github.com/nlohmann/json
//
// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
// SPDX-License-Identifier: MIT
#include <benchmark/benchmark.h>
#include <nlohmann/json.hpp>
#include <fstream>
#include <numeric>
#include <vector>
#include <test_data.hpp>
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, TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json");
BENCHMARK_CAPTURE(ParseFile, canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json");
BENCHMARK_CAPTURE(ParseFile, citm_catalog, TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json");
BENCHMARK_CAPTURE(ParseFile, twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json");
BENCHMARK_CAPTURE(ParseFile, floats, TEST_DATA_DIRECTORY "/regression/floats.json");
BENCHMARK_CAPTURE(ParseFile, signed_ints, TEST_DATA_DIRECTORY "/regression/signed_ints.json");
BENCHMARK_CAPTURE(ParseFile, unsigned_ints, TEST_DATA_DIRECTORY "/regression/unsigned_ints.json");
BENCHMARK_CAPTURE(ParseFile, small_signed_ints, TEST_DATA_DIRECTORY "/regression/small_signed_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, TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json");
BENCHMARK_CAPTURE(ParseString, canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json");
BENCHMARK_CAPTURE(ParseString, citm_catalog, TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json");
BENCHMARK_CAPTURE(ParseString, twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json");
BENCHMARK_CAPTURE(ParseString, floats, TEST_DATA_DIRECTORY "/regression/floats.json");
BENCHMARK_CAPTURE(ParseString, signed_ints, TEST_DATA_DIRECTORY "/regression/signed_ints.json");
BENCHMARK_CAPTURE(ParseString, unsigned_ints, TEST_DATA_DIRECTORY "/regression/unsigned_ints.json");
BENCHMARK_CAPTURE(ParseString, small_signed_ints, TEST_DATA_DIRECTORY "/regression/small_signed_ints.json");
//////////////////////////////////////////////////////////////////////////////
// validate JSON from string
//////////////////////////////////////////////////////////////////////////////
static void Accept(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())
{
benchmark::DoNotOptimize(json::accept(str));
}
state.SetBytesProcessed(state.iterations() * str.size());
}
BENCHMARK_CAPTURE(Accept, jeopardy, TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json");
BENCHMARK_CAPTURE(Accept, canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json");
BENCHMARK_CAPTURE(Accept, citm_catalog, TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json");
BENCHMARK_CAPTURE(Accept, twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json");
BENCHMARK_CAPTURE(Accept, floats, TEST_DATA_DIRECTORY "/regression/floats.json");
BENCHMARK_CAPTURE(Accept, signed_ints, TEST_DATA_DIRECTORY "/regression/signed_ints.json");
BENCHMARK_CAPTURE(Accept, unsigned_ints, TEST_DATA_DIRECTORY "/regression/unsigned_ints.json");
BENCHMARK_CAPTURE(Accept, small_signed_ints, TEST_DATA_DIRECTORY "/regression/small_signed_ints.json");
//////////////////////////////////////////////////////////////////////////////
// parse pretty-printed JSON from string
//
// Every file in the corpus above is minified or only lightly spaced, so none of
// them exercise the lexer's whitespace handling. Real-world JSON is frequently
// indented - configuration files, pretty-printed API responses, anything kept
// under version control - where insignificant whitespace can outweigh the data.
// Re-serializing a document with an indentation and parsing that keeps the
// content identical to the ParseString row above, so the pair isolates the cost
// of the whitespace alone.
//////////////////////////////////////////////////////////////////////////////
static void ParseIndented(benchmark::State& state, const char* filename, int indent)
{
std::ifstream f(filename);
std::string str((std::istreambuf_iterator<char>(f)), std::istreambuf_iterator<char>());
const std::string indented = json::parse(str).dump(indent);
while (state.KeepRunning())
{
state.PauseTiming();
auto* j = new json();
state.ResumeTiming();
*j = json::parse(indented);
state.PauseTiming();
delete j;
state.ResumeTiming();
}
state.SetBytesProcessed(state.iterations() * indented.size());
}
BENCHMARK_CAPTURE(ParseIndented, jeopardy / 4, TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json", 4);
BENCHMARK_CAPTURE(ParseIndented, canada / 4, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json", 4);
BENCHMARK_CAPTURE(ParseIndented, citm_catalog / 4, TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json", 4);
BENCHMARK_CAPTURE(ParseIndented, twitter / 4, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", 4);
//////////////////////////////////////////////////////////////////////////////
// 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())
{
std::string output = j.dump(indent);
benchmark::DoNotOptimize(output);
}
state.SetBytesProcessed(state.iterations() * j.dump(indent).size());
}
BENCHMARK_CAPTURE(Dump, jeopardy / -, TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json", -1);
BENCHMARK_CAPTURE(Dump, jeopardy / 4, TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json", 4);
BENCHMARK_CAPTURE(Dump, canada / -, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json", -1);
BENCHMARK_CAPTURE(Dump, canada / 4, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json", 4);
BENCHMARK_CAPTURE(Dump, citm_catalog / -, TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json", -1);
BENCHMARK_CAPTURE(Dump, citm_catalog / 4, TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json", 4);
BENCHMARK_CAPTURE(Dump, twitter / -, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", -1);
BENCHMARK_CAPTURE(Dump, twitter / 4, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", 4);
BENCHMARK_CAPTURE(Dump, floats / -, TEST_DATA_DIRECTORY "/regression/floats.json", -1);
BENCHMARK_CAPTURE(Dump, floats / 4, TEST_DATA_DIRECTORY "/regression/floats.json", 4);
BENCHMARK_CAPTURE(Dump, signed_ints / -, TEST_DATA_DIRECTORY "/regression/signed_ints.json", -1);
BENCHMARK_CAPTURE(Dump, signed_ints / 4, TEST_DATA_DIRECTORY "/regression/signed_ints.json", 4);
BENCHMARK_CAPTURE(Dump, unsigned_ints / -, TEST_DATA_DIRECTORY "/regression/unsigned_ints.json", -1);
BENCHMARK_CAPTURE(Dump, unsigned_ints / 4, TEST_DATA_DIRECTORY "/regression/unsigned_ints.json", 4);
BENCHMARK_CAPTURE(Dump, small_signed_ints / -, TEST_DATA_DIRECTORY "/regression/small_signed_ints.json", -1);
BENCHMARK_CAPTURE(Dump, small_signed_ints / 4, TEST_DATA_DIRECTORY "/regression/small_signed_ints.json", 4);
//////////////////////////////////////////////////////////////////////////////
// serialize CBOR
//////////////////////////////////////////////////////////////////////////////
static void ToCbor(benchmark::State& state, const char* filename)
{
std::ifstream f(filename);
std::string str((std::istreambuf_iterator<char>(f)), std::istreambuf_iterator<char>());
json j = json::parse(str);
while (state.KeepRunning())
{
json::to_cbor(j);
}
state.SetBytesProcessed(state.iterations() * json::to_cbor(j).size());
}
BENCHMARK_CAPTURE(ToCbor, jeopardy, TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json");
BENCHMARK_CAPTURE(ToCbor, canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json");
BENCHMARK_CAPTURE(ToCbor, citm_catalog, TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json");
BENCHMARK_CAPTURE(ToCbor, twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json");
BENCHMARK_CAPTURE(ToCbor, floats, TEST_DATA_DIRECTORY "/regression/floats.json");
BENCHMARK_CAPTURE(ToCbor, signed_ints, TEST_DATA_DIRECTORY "/regression/signed_ints.json");
BENCHMARK_CAPTURE(ToCbor, unsigned_ints, TEST_DATA_DIRECTORY "/regression/unsigned_ints.json");
BENCHMARK_CAPTURE(ToCbor, small_signed_ints, TEST_DATA_DIRECTORY "/regression/small_signed_ints.json");
//////////////////////////////////////////////////////////////////////////////
// Parse Msgpack
//////////////////////////////////////////////////////////////////////////////
static void FromMsgpack(benchmark::State& state, const char* filename)
{
std::ifstream f(filename);
std::string str((std::istreambuf_iterator<char>(f)), std::istreambuf_iterator<char>());
auto bytes = json::to_msgpack(json::parse(str));
std::ofstream o("test.msgpack");
o.write((char*)bytes.data(), bytes.size());
o.flush();
o.close();
for (auto _ : state)
{
state.PauseTiming();
auto* j = new json();
auto file = fopen("test.msgpack", "rb");
state.ResumeTiming();
*j = json::from_msgpack(file);
state.PauseTiming();
fclose(file);
delete j;
state.ResumeTiming();
}
state.SetBytesProcessed(state.iterations() * bytes.size());
}
BENCHMARK_CAPTURE(FromMsgpack, jeopardy, TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json");
BENCHMARK_CAPTURE(FromMsgpack, canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json");
BENCHMARK_CAPTURE(FromMsgpack, citm_catalog, TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json");
BENCHMARK_CAPTURE(FromMsgpack, twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json");
BENCHMARK_CAPTURE(FromMsgpack, floats, TEST_DATA_DIRECTORY "/regression/floats.json");
BENCHMARK_CAPTURE(FromMsgpack, signed_ints, TEST_DATA_DIRECTORY "/regression/signed_ints.json");
BENCHMARK_CAPTURE(FromMsgpack, unsigned_ints, TEST_DATA_DIRECTORY "/regression/unsigned_ints.json");
BENCHMARK_CAPTURE(FromMsgpack, small_signed_ints, TEST_DATA_DIRECTORY "/regression/small_signed_ints.json");
//////////////////////////////////////////////////////////////////////////////
// serialize binary CBOR
//////////////////////////////////////////////////////////////////////////////
static void BinaryToCbor(benchmark::State& state)
{
std::vector<uint8_t> data(256);
std::iota(data.begin(), data.end(), 0);
auto it = data.begin();
std::vector<uint8_t> in;
in.reserve(state.range(0));
for (int i = 0; i < state.range(0); ++i)
{
if (it == data.end())
{
it = data.begin();
}
in.push_back(*it);
++it;
}
json::binary_t bin{in};
json j{{"type", "binary"}, {"data", bin}};
while (state.KeepRunning())
{
json::to_cbor(j);
}
state.SetBytesProcessed(state.iterations() * json::to_cbor(j).size());
}
BENCHMARK(BinaryToCbor)->RangeMultiplier(2)->Range(8, 8 << 12);
//////////////////////////////////////////////////////////////////////////////
// parse binary formats
//////////////////////////////////////////////////////////////////////////////
// Only MessagePack had a read benchmark (FromMsgpack above, left untouched so
// its numbers stay comparable across releases). The benchmarks below cover the
// other formats, and read from a contiguous buffer as well as from a FILE*:
// most callers pass a container, and the two adapters compile to different
// code. The test data repository ships JSON only, so the input for each is
// derived at setup time by serializing a parsed test file.
/// binary format to benchmark; the _optimized variants add UBJSON/BJData size
/// and type annotations, which the readers handle in a separate code path
enum class binary_format
{
cbor,
msgpack,
ubjson,
ubjson_optimized,
bjdata,
bjdata_optimized,
bson,
bon8
};
static std::vector<std::uint8_t> to_binary(const json& j, const binary_format format)
{
switch (format)
{
case binary_format::cbor:
return json::to_cbor(j);
case binary_format::msgpack:
return json::to_msgpack(j);
case binary_format::ubjson:
return json::to_ubjson(j);
case binary_format::ubjson_optimized:
return json::to_ubjson(j, true, true);
case binary_format::bjdata:
return json::to_bjdata(j);
case binary_format::bjdata_optimized:
return json::to_bjdata(j, true, true);
case binary_format::bon8:
return json::to_bon8(j);
case binary_format::bson:
default:
return json::to_bson(j);
}
}
static json from_binary(const std::vector<std::uint8_t>& bytes, const binary_format format)
{
switch (format)
{
case binary_format::cbor:
return json::from_cbor(bytes);
case binary_format::msgpack:
return json::from_msgpack(bytes);
case binary_format::ubjson:
case binary_format::ubjson_optimized:
return json::from_ubjson(bytes);
case binary_format::bjdata:
case binary_format::bjdata_optimized:
return json::from_bjdata(bytes);
case binary_format::bon8:
return json::from_bon8(bytes);
case binary_format::bson:
default:
return json::from_bson(bytes);
}
}
static json from_binary(std::FILE* file, const binary_format format)
{
switch (format)
{
case binary_format::cbor:
return json::from_cbor(file);
case binary_format::msgpack:
return json::from_msgpack(file);
case binary_format::ubjson:
case binary_format::ubjson_optimized:
return json::from_ubjson(file);
case binary_format::bjdata:
case binary_format::bjdata_optimized:
return json::from_bjdata(file);
case binary_format::bon8:
return json::from_bon8(file);
case binary_format::bson:
default:
return json::from_bson(file);
}
}
/*!
@brief serialize a parsed test file to @a format
Returns an empty vector and marks the benchmark as skipped if the file cannot
be represented in the format, rather than letting the exception escape: BSON
requires an object at the top level, and several test files are arrays.
*/
static std::vector<std::uint8_t> binary_input(benchmark::State& state, const char* filename, const binary_format format)
{
std::ifstream f(filename);
std::string const str((std::istreambuf_iterator<char>(f)), std::istreambuf_iterator<char>());
const json j = json::parse(str);
if (format == binary_format::bson && !j.is_object())
{
state.SkipWithError("BSON requires an object at the top level");
return {};
}
return to_binary(j, format);
}
static void FromBinaryBuffer(benchmark::State& state, const char* filename, const binary_format format)
{
const std::vector<std::uint8_t> bytes = binary_input(state, filename, format);
if (bytes.empty())
{
return;
}
for (auto _ : state)
{
// the value is destroyed outside the timed section, because destroying
// a large DOM is not what this benchmark measures
state.PauseTiming();
auto* j = new json();
state.ResumeTiming();
*j = from_binary(bytes, format);
state.PauseTiming();
delete j;
state.ResumeTiming();
}
state.SetBytesProcessed(state.iterations() * bytes.size());
}
BENCHMARK_CAPTURE(FromBinaryBuffer, cbor / jeopardy, TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json", binary_format::cbor);
BENCHMARK_CAPTURE(FromBinaryBuffer, cbor / canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json", binary_format::cbor);
BENCHMARK_CAPTURE(FromBinaryBuffer, cbor / citm_catalog, TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json", binary_format::cbor);
BENCHMARK_CAPTURE(FromBinaryBuffer, cbor / twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", binary_format::cbor);
BENCHMARK_CAPTURE(FromBinaryBuffer, cbor / floats, TEST_DATA_DIRECTORY "/regression/floats.json", binary_format::cbor);
BENCHMARK_CAPTURE(FromBinaryBuffer, cbor / signed_ints, TEST_DATA_DIRECTORY "/regression/signed_ints.json", binary_format::cbor);
BENCHMARK_CAPTURE(FromBinaryBuffer, msgpack / jeopardy, TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json", binary_format::msgpack);
BENCHMARK_CAPTURE(FromBinaryBuffer, msgpack / canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json", binary_format::msgpack);
BENCHMARK_CAPTURE(FromBinaryBuffer, msgpack / citm_catalog, TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json", binary_format::msgpack);
BENCHMARK_CAPTURE(FromBinaryBuffer, msgpack / twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", binary_format::msgpack);
BENCHMARK_CAPTURE(FromBinaryBuffer, ubjson / jeopardy, TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json", binary_format::ubjson);
BENCHMARK_CAPTURE(FromBinaryBuffer, ubjson / canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json", binary_format::ubjson);
BENCHMARK_CAPTURE(FromBinaryBuffer, ubjson / citm_catalog, TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json", binary_format::ubjson);
BENCHMARK_CAPTURE(FromBinaryBuffer, ubjson / twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", binary_format::ubjson);
BENCHMARK_CAPTURE(FromBinaryBuffer, ubjson_optimized / canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json", binary_format::ubjson_optimized);
BENCHMARK_CAPTURE(FromBinaryBuffer, ubjson_optimized / twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", binary_format::ubjson_optimized);
BENCHMARK_CAPTURE(FromBinaryBuffer, bjdata / canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json", binary_format::bjdata);
BENCHMARK_CAPTURE(FromBinaryBuffer, bjdata / twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", binary_format::bjdata);
BENCHMARK_CAPTURE(FromBinaryBuffer, bjdata_optimized / canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json", binary_format::bjdata_optimized);
BENCHMARK_CAPTURE(FromBinaryBuffer, bjdata_optimized / twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", binary_format::bjdata_optimized);
BENCHMARK_CAPTURE(FromBinaryBuffer, bon8 / jeopardy, TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json", binary_format::bon8);
BENCHMARK_CAPTURE(FromBinaryBuffer, bon8 / canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json", binary_format::bon8);
BENCHMARK_CAPTURE(FromBinaryBuffer, bon8 / citm_catalog, TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json", binary_format::bon8);
BENCHMARK_CAPTURE(FromBinaryBuffer, bon8 / twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", binary_format::bon8);
// BSON requires an object at the top level, so the array-rooted test files
// (jeopardy and the regression files) cannot be captured here
BENCHMARK_CAPTURE(FromBinaryBuffer, bson / canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json", binary_format::bson);
BENCHMARK_CAPTURE(FromBinaryBuffer, bson / citm_catalog, TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json", binary_format::bson);
BENCHMARK_CAPTURE(FromBinaryBuffer, bson / twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", binary_format::bson);
static void FromBinaryFile(benchmark::State& state, const char* filename, const binary_format format)
{
const std::vector<std::uint8_t> bytes = binary_input(state, filename, format);
if (bytes.empty())
{
return;
}
const char* tmp = "benchmark_input.bin";
std::ofstream o(tmp, std::ios::binary);
o.write(reinterpret_cast<const char*>(bytes.data()), static_cast<std::streamsize>(bytes.size()));
o.flush();
o.close();
for (auto _ : state)
{
state.PauseTiming();
auto* j = new json();
auto* file = std::fopen(tmp, "rb");
state.ResumeTiming();
*j = from_binary(file, format);
state.PauseTiming();
std::fclose(file);
delete j;
state.ResumeTiming();
}
state.SetBytesProcessed(state.iterations() * bytes.size());
}
BENCHMARK_CAPTURE(FromBinaryFile, cbor / canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json", binary_format::cbor);
BENCHMARK_CAPTURE(FromBinaryFile, cbor / twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", binary_format::cbor);
BENCHMARK_CAPTURE(FromBinaryFile, ubjson / canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json", binary_format::ubjson);
BENCHMARK_CAPTURE(FromBinaryFile, ubjson / twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", binary_format::ubjson);
BENCHMARK_CAPTURE(FromBinaryFile, bjdata / twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", binary_format::bjdata);
BENCHMARK_CAPTURE(FromBinaryFile, bon8 / canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json", binary_format::bon8);
BENCHMARK_CAPTURE(FromBinaryFile, bon8 / twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", binary_format::bon8);
BENCHMARK_CAPTURE(FromBinaryFile, bson / twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", binary_format::bson);
//////////////////////////////////////////////////////////////////////////////
// parse binary formats: value shapes
//////////////////////////////////////////////////////////////////////////////
// The test files above are wide and shallow, but the readers' cost is per
// container, so these cover the shapes that stress the container handling
// itself. Every shape is wrapped in an object so that BSON, which requires an
// object at the top level, measures the same value as the other formats.
/// deeply nested arrays: one container per level, no other work
static json make_nested()
{
json nested = json::array();
json* p = &nested;
for (std::size_t i = 1; i < 1000; ++i)
{
p->push_back(json::array());
p = &p->operator[](0);
}
json j = json::object();
j["data"] = std::move(nested);
return j;
}
/// many sibling containers: maximum container churn, minimum nesting
static json make_containers()
{
json data = json::array();
for (std::size_t i = 0; i < 100000; ++i)
{
data.push_back(json::array({1, 2}));
}
json j = json::object();
j["data"] = std::move(data);
return j;
}
/// one flat array of numbers: the scalar decoding path, which must not move
static json make_scalars()
{
json data = json::array();
for (std::size_t i = 0; i < 1000000; ++i)
{
data.push_back(i);
}
json j = json::object();
j["data"] = std::move(data);
return j;
}
static void FromBinaryShape(benchmark::State& state, json (*build)(), const binary_format format)
{
const std::vector<std::uint8_t> bytes = to_binary(build(), format);
for (auto _ : state)
{
state.PauseTiming();
auto* j = new json();
state.ResumeTiming();
*j = from_binary(bytes, format);
state.PauseTiming();
delete j;
state.ResumeTiming();
}
state.SetBytesProcessed(state.iterations() * bytes.size());
}
BENCHMARK_CAPTURE(FromBinaryShape, nested / cbor, make_nested, binary_format::cbor);
BENCHMARK_CAPTURE(FromBinaryShape, nested / msgpack, make_nested, binary_format::msgpack);
BENCHMARK_CAPTURE(FromBinaryShape, nested / ubjson, make_nested, binary_format::ubjson);
BENCHMARK_CAPTURE(FromBinaryShape, nested / bjdata, make_nested, binary_format::bjdata);
BENCHMARK_CAPTURE(FromBinaryShape, nested / bson, make_nested, binary_format::bson);
BENCHMARK_CAPTURE(FromBinaryShape, nested / bon8, make_nested, binary_format::bon8);
BENCHMARK_CAPTURE(FromBinaryShape, containers / cbor, make_containers, binary_format::cbor);
BENCHMARK_CAPTURE(FromBinaryShape, containers / msgpack, make_containers, binary_format::msgpack);
BENCHMARK_CAPTURE(FromBinaryShape, containers / ubjson, make_containers, binary_format::ubjson);
BENCHMARK_CAPTURE(FromBinaryShape, containers / ubjson_optimized, make_containers, binary_format::ubjson_optimized);
BENCHMARK_CAPTURE(FromBinaryShape, containers / bjdata, make_containers, binary_format::bjdata);
BENCHMARK_CAPTURE(FromBinaryShape, containers / bson, make_containers, binary_format::bson);
BENCHMARK_CAPTURE(FromBinaryShape, containers / bon8, make_containers, binary_format::bon8);
// BSON names every array element, so a large array measures key generation
// rather than scalar decoding and is left out here
BENCHMARK_CAPTURE(FromBinaryShape, scalars / cbor, make_scalars, binary_format::cbor);
BENCHMARK_CAPTURE(FromBinaryShape, scalars / msgpack, make_scalars, binary_format::msgpack);
BENCHMARK_CAPTURE(FromBinaryShape, scalars / ubjson, make_scalars, binary_format::ubjson);
BENCHMARK_CAPTURE(FromBinaryShape, scalars / bjdata, make_scalars, binary_format::bjdata);
BENCHMARK_CAPTURE(FromBinaryShape, scalars / bon8, make_scalars, binary_format::bon8);
/*!
@brief parse an indefinite-length CBOR string
The writer never emits this form, so the input is assembled by hand: 0x7F
opens the string, each chunk is a one-character string, and 0xFF closes it.
*/
static void FromCborChunkedString(benchmark::State& state, const std::size_t chunks)
{
std::vector<std::uint8_t> bytes;
bytes.reserve(2 * chunks + 2);
bytes.push_back(0x7F);
for (std::size_t i = 0; i < chunks; ++i)
{
bytes.push_back(0x61); // string of length 1
bytes.push_back(0x61); // 'a'
}
bytes.push_back(0xFF);
for (auto _ : state)
{
json j = json::from_cbor(bytes);
benchmark::DoNotOptimize(j);
}
state.SetBytesProcessed(state.iterations() * bytes.size());
}
BENCHMARK_CAPTURE(FromCborChunkedString, 10000 chunks, 10000);
BENCHMARK_MAIN();
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