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json/tests/benchmarks/src/benchmarks.cpp
T
Niels Lohmann 65af260117 Move instead of deep-copy ordered_json values when an object grows (#5609) 
* Move instead of deep-copy ordered_json values when an object grows

ordered_map keeps its elements in a std::vector<std::pair<const Key, T>>.
With a std::string key, that pair is not nothrow move constructible (the
const key has to be copied), so std::vector copies every element when it
reallocates. For ordered_json, this deep-copies every member value an
object already holds, including whole nested subtrees, on each growth
step.

Grow the storage in ordered_map instead, copying the keys and moving the
values. This happens in two phases, so the strong exception guarantee is
kept without try/catch. The first phase may throw, but only touches a
temporary buffer: it copies the keys, value-initializes the values, and
constructs the new element. The second phase moves the values (noexcept)
and swaps the buffers. Because the new element is constructed before any
value is moved, arguments that refer to elements of the container stay
valid, as with std::vector. Types that cannot take this path keep the
std::vector behavior.

Parsing into ordered_json (ParseStringOrdered, Apple M1 Max, clang -O3):
twitter 3.20 -> 1.70 ms, citm_catalog 7.73 -> 3.67 ms, jeopardy 219 ->
177 ms, canada unchanged. The number of allocations for twitter and
citm_catalog drops by two thirds.

Also add ParseStringOrdered rows to the benchmarks, and document the
growth behavior and the exception safety of ordered_map.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Fix CI: skip std::pair noexcept assumptions on EDG-based compilers

ci_icpc and ci_nvhpc failed to compile unit-ordered_map.cpp: the static
assertion that std::pair<const std::string, ordered_json> is not nothrow
move-constructible fails there. The EDG front end (Intel icpc 2021.10,
NVIDIA nvc++ 25.5) considers the defaulted move constructor of
std::pair<const Key, T> noexcept even if copying Key can throw. With these
compilers, std::vector already moves such elements itself when it grows,
and ordered_map correctly leaves growing to it.

The same misjudgement makes std::vector call std::terminate when a key copy
throws during growth, so the exception-safety test with throwing_key would
abort on these compilers as well.

Skip the static assertion and the exception-safety section when __EDG__ is
defined. Verified with icpc 2021.10 (-std=gnu++11) and nvc++ 25.5 (C++11 and
C++17) on Compiler Explorer: unit-ordered_map and unit-disabled_exceptions
build and pass.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

---------

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
2026-09-30 20:06:34 +02:00

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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");
//////////////////////////////////////////////////////////////////////////////
// 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);
//////////////////////////////////////////////////////////////////////////////
// parse JSON from string into an ordered_json
//
// Same as ParseString above, but with nlohmann::ordered_json, whose objects
// keep their members in a vector: the pair of rows shows what preserving the
// insertion order costs.
//////////////////////////////////////////////////////////////////////////////
static void ParseStringOrdered(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 nlohmann::ordered_json();
state.ResumeTiming();
*j = nlohmann::ordered_json::parse(str);
state.PauseTiming();
delete j;
state.ResumeTiming();
}
state.SetBytesProcessed(state.iterations() * str.size());
}
BENCHMARK_CAPTURE(ParseStringOrdered, jeopardy, TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json");
BENCHMARK_CAPTURE(ParseStringOrdered, canada, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json");
BENCHMARK_CAPTURE(ParseStringOrdered, citm_catalog, TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json");
BENCHMARK_CAPTURE(ParseStringOrdered, twitter, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.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())
{
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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