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f39b5b1baee56d0eceb22c9eacb2ea749085d257
json/tests/benchmarks/json_view/bench_view.cpp
T
Niels Lohmann f39b5b1bae Compare json_view with yyjson, simdjson, and Boost.JSON 
tests/benchmarks/json_view/ holds a comparison with other
libraries, answering the question users ask when they pick one.
It is not built by CMake and not run by CI.

- bench_view.cpp: parse, traverse, select and dump of twitter,
  citm_catalog, canada, jeopardy, a tweet and an RPC request,
  against json_view, yyjson, simdjson, Boost.JSON and json::parse,
  all agreeing and run interleaved.
- bench_corpus.cpp: parse, traverse and dump of any file list.
- bench_edit.cpp: parses, edits through each library's own API,
  and serializes; all outputs must describe the same value.
- compare.py: builds both programs with system or pinned,
  SHA-256-checked downloads, and writes results with the commit,
  CPU, OS, compiler and library versions.
- README.md and a workflow that runs on demand or via a PR label.

Fairness fixes folded in: each engine runs once untimed before
each timed round, so the next one no longer pays for the
previous one's cleanup; dump is also compared with source numbers
against yyjson's raw-number mode; a "simdjson DOM (fresh)" column
and a reused-document column for json_view were added;
compare.py's paths are absolute; downloads use a .part file and a
failed checksum removes the archive.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
2026-10-06 10:48:07 +02:00

750 lines
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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
// Same-feature-set benchmark: read-only JSON documents with random access.
//
// json_view nlohmann/json_view.hpp (fresh document per parse / reused)
// yyjson yyjson_read(): immutable document, random access
// simdjson DOM dom::parser (reused, as recommended; "fresh": a new parser
// per parse): immutable, random access
// references (different feature sets):
// simdjson OD On-Demand: forward-only, lazy
// Boost.JSON owning, mutable DOM (monotonic resource)
// json::parse owning, mutable DOM (nlohmann today)
//
// Workloads: parse (build + free), traverse (visit everything, convert every
// number, touch every string and key), select (a few fields per document),
// dump (compact serialization of the parsed document).
// All engines run interleaved in every round, each timed call after an untimed
// one of the same engine; the best round is reported.
#include <nlohmann/json_view.hpp>
#if JSON_VIEW_BENCH_BOOST
#include <boost/json.hpp>
#include <boost/json/src.hpp>
#endif
#include <simdjson.h>
#include <yyjson.h>
#include <algorithm>
#include <chrono>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <fstream>
#include <functional>
#include <map>
#include <sstream>
using nlohmann::json;
using nlohmann::json_document;
using nlohmann::json_view;
static volatile double g_sink;
struct stats
{
double num = 0;
std::size_t str = 0, nodes = 0;
};
// ---------------- traversal ----------------
static void walk(json_view v, stats& st)
{
++st.nodes;
switch (v.type())
{
case json::value_t::object:
for (auto it = v.begin(); it != v.end(); ++it)
{
st.str += it.key().size();
walk(*it, st);
}
break;
case json::value_t::array:
for (const json_view e : v)
{
walk(e, st);
}
break;
case json::value_t::string:
st.str += v.get_string().size();
break;
case json::value_t::number_integer:
st.num += static_cast<double>(v.get<std::int64_t>());
break;
case json::value_t::number_unsigned:
st.num += static_cast<double>(v.get<std::uint64_t>());
break;
case json::value_t::number_float:
st.num += v.get<double>();
break;
default:
break;
}
}
static void walk(const json& j, stats& st)
{
++st.nodes;
switch (j.type())
{
case json::value_t::object:
for (const auto& kv : j.get_ref<const json::object_t&>())
{
st.str += kv.first.size();
walk(kv.second, st);
}
break;
case json::value_t::array:
for (const auto& e : j.get_ref<const json::array_t&>())
{
walk(e, st);
}
break;
case json::value_t::string:
st.str += j.get_ref<const std::string&>().size();
break;
case json::value_t::number_integer:
st.num += static_cast<double>(*j.get_ptr<const json::number_integer_t*>());
break;
case json::value_t::number_unsigned:
st.num += static_cast<double>(*j.get_ptr<const json::number_unsigned_t*>());
break;
case json::value_t::number_float:
st.num += *j.get_ptr<const json::number_float_t*>();
break;
default:
break;
}
}
static void walk(yyjson_val* v, stats& st)
{
++st.nodes;
switch (yyjson_get_type(v))
{
case YYJSON_TYPE_OBJ:
{
std::size_t idx, max;
yyjson_val* k, * val;
yyjson_obj_foreach(v, idx, max, k, val)
{
st.str += yyjson_get_len(k);
walk(val, st);
}
break;
}
case YYJSON_TYPE_ARR:
{
std::size_t idx, max;
yyjson_val* val;
yyjson_arr_foreach(v, idx, max, val)
{
walk(val, st);
}
break;
}
case YYJSON_TYPE_STR:
st.str += yyjson_get_len(v);
break;
case YYJSON_TYPE_NUM:
if (yyjson_is_sint(v))
{
st.num += static_cast<double>(yyjson_get_sint(v));
}
else if (yyjson_is_uint(v))
{
st.num += static_cast<double>(yyjson_get_uint(v));
}
else
{
st.num += yyjson_get_real(v);
}
break;
default:
break;
}
}
static void walk(simdjson::dom::element e, stats& st)
{
++st.nodes;
switch (e.type())
{
case simdjson::dom::element_type::OBJECT:
for (auto f : simdjson::dom::object(e))
{
st.str += f.key.size();
walk(f.value, st);
}
break;
case simdjson::dom::element_type::ARRAY:
for (auto c : simdjson::dom::array(e))
{
walk(c, st);
}
break;
case simdjson::dom::element_type::STRING:
st.str += std::string_view(e).size();
break;
case simdjson::dom::element_type::INT64:
st.num += static_cast<double>(int64_t(e));
break;
case simdjson::dom::element_type::UINT64:
st.num += static_cast<double>(uint64_t(e));
break;
case simdjson::dom::element_type::DOUBLE:
st.num += double(e);
break;
default:
break;
}
}
static void walk_od(simdjson::ondemand::value v, stats& st)
{
++st.nodes;
switch (v.type())
{
case simdjson::ondemand::json_type::object:
for (auto f : v.get_object())
{
st.str += std::string_view(f.unescaped_key()).size();
walk_od(f.value(), st);
}
break;
case simdjson::ondemand::json_type::array:
for (auto c : v.get_array())
{
walk_od(c.value(), st);
}
break;
case simdjson::ondemand::json_type::string:
st.str += std::string_view(v.get_string()).size();
break;
case simdjson::ondemand::json_type::number:
{
simdjson::ondemand::number n = v.get_number();
switch (n.get_number_type())
{
case simdjson::ondemand::number_type::signed_integer:
st.num += static_cast<double>(n.get_int64());
break;
case simdjson::ondemand::number_type::unsigned_integer:
st.num += static_cast<double>(n.get_uint64());
break;
default:
st.num += n.get_double();
break;
}
break;
}
case simdjson::ondemand::json_type::boolean:
(void)bool(v.get_bool());
break;
default:
(void)v.is_null();
break;
}
}
#if JSON_VIEW_BENCH_BOOST
static void walk(const boost::json::value& v, stats& st)
{
++st.nodes;
switch (v.kind())
{
case boost::json::kind::object:
for (const auto& kv : v.get_object())
{
st.str += kv.key().size();
walk(kv.value(), st);
}
break;
case boost::json::kind::array:
for (const auto& c : v.get_array())
{
walk(c, st);
}
break;
case boost::json::kind::string:
st.str += v.get_string().size();
break;
case boost::json::kind::int64:
st.num += static_cast<double>(v.get_int64());
break;
case boost::json::kind::uint64:
st.num += static_cast<double>(v.get_uint64());
break;
case boost::json::kind::double_:
st.num += v.get_double();
break;
default:
break;
}
}
#endif
// ---------------- selective access ----------------
// twitter: per status id, user.screen_name, retweet_count
// citm: per performance id, eventId, #seatCategories; #events
// canada: type, features[0].geometry.type, #coordinates
// jeopardy: per question: round == "Final Jeopardy!", len(category)
// status (one tweet): id, user.screen_name, retweet_count
// rpc: method, params.minuend, id
static double pick(const std::string& name, json_view r)
{
double acc = 0;
if (name == "twitter" || name == "status")
{
auto one = [&](json_view s)
{
acc += static_cast<double>(s["id"].get<std::uint64_t>());
acc += static_cast<double>(s["user"]["screen_name"].get_string().size());
acc += static_cast<double>(s["retweet_count"].get<std::int64_t>());
};
if (name == "twitter")
{
for (const json_view s : r["statuses"])
{
one(s);
}
}
else
{
one(r);
}
}
else if (name == "citm_catalog")
{
for (const json_view p : r["performances"])
{
acc += static_cast<double>(p["id"].get<std::uint64_t>() + p["eventId"].get<std::uint64_t>() + p["seatCategories"].size());
}
acc += static_cast<double>(r["events"].size());
}
else if (name == "canada")
{
const json_view g = r["features"][0]["geometry"];
acc += static_cast<double>(r["type"].get_string().size() + g["type"].get_string().size() + g["coordinates"].size());
}
else if (name == "jeopardy")
{
for (const json_view q : r)
{
acc += q["round"].get_string() == "Final Jeopardy!" ? 1 : 0;
acc += static_cast<double>(q["category"].get_string().size());
}
}
else if (name == "rpc")
{
acc += static_cast<double>(r["method"].get_string().size());
acc += static_cast<double>(r["params"]["minuend"].get<std::int64_t>() + r["id"].get<std::int64_t>());
}
return acc;
}
static double pick(const std::string& name, const json& r)
{
double acc = 0;
if (name == "twitter" || name == "status")
{
auto one = [&](const json & s)
{
acc += static_cast<double>(s["id"].get<std::uint64_t>());
acc += static_cast<double>(s["user"]["screen_name"].get_ref<const std::string&>().size());
acc += static_cast<double>(s["retweet_count"].get<std::int64_t>());
};
if (name == "twitter")
{
for (const auto& s : r["statuses"])
{
one(s);
}
}
else
{
one(r);
}
}
else if (name == "citm_catalog")
{
for (const auto& p : r["performances"])
{
acc += static_cast<double>(p["id"].get<std::uint64_t>() + p["eventId"].get<std::uint64_t>() + p["seatCategories"].size());
}
acc += static_cast<double>(r["events"].size());
}
else if (name == "canada")
{
const json& g = r["features"][0]["geometry"];
acc += static_cast<double>(r["type"].get_ref<const std::string&>().size() + g["type"].get_ref<const std::string&>().size() + g["coordinates"].size());
}
else if (name == "jeopardy")
{
for (const auto& q : r)
{
acc += q["round"].get_ref<const std::string&>() == "Final Jeopardy!" ? 1 : 0;
acc += static_cast<double>(q["category"].get_ref<const std::string&>().size());
}
}
else if (name == "rpc")
{
acc += static_cast<double>(r["method"].get_ref<const std::string&>().size());
acc += static_cast<double>(r["params"]["minuend"].get<std::int64_t>() + r["id"].get<std::int64_t>());
}
return acc;
}
static double pick(const std::string& name, yyjson_val* r)
{
double acc = 0;
auto get = [](yyjson_val * o, const char* k)
{
return yyjson_obj_get(o, k);
};
if (name == "twitter" || name == "status")
{
auto one = [&](yyjson_val * s)
{
acc += static_cast<double>(yyjson_get_uint(get(s, "id")));
acc += static_cast<double>(yyjson_get_len(get(get(s, "user"), "screen_name")));
acc += static_cast<double>(yyjson_get_sint(get(s, "retweet_count")));
};
if (name == "twitter")
{
std::size_t idx, max;
yyjson_val* s;
yyjson_arr_foreach(get(r, "statuses"), idx, max, s)
{
one(s);
}
}
else
{
one(r);
}
}
else if (name == "citm_catalog")
{
std::size_t idx, max;
yyjson_val* p;
yyjson_arr_foreach(get(r, "performances"), idx, max, p)
{
acc += static_cast<double>(yyjson_get_uint(get(p, "id")) + yyjson_get_uint(get(p, "eventId")) + yyjson_arr_size(get(p, "seatCategories")));
}
acc += static_cast<double>(yyjson_obj_size(get(r, "events")));
}
else if (name == "canada")
{
yyjson_val* g = get(yyjson_arr_get(get(r, "features"), 0), "geometry");
acc += static_cast<double>(yyjson_get_len(get(r, "type")) + yyjson_get_len(get(g, "type")) + yyjson_arr_size(get(g, "coordinates")));
}
else if (name == "jeopardy")
{
std::size_t idx, max;
yyjson_val* q;
yyjson_arr_foreach(r, idx, max, q)
{
acc += yyjson_equals_str(get(q, "round"), "Final Jeopardy!") ? 1 : 0;
acc += static_cast<double>(yyjson_get_len(get(q, "category")));
}
}
else if (name == "rpc")
{
acc += static_cast<double>(yyjson_get_len(get(r, "method")));
acc += static_cast<double>(yyjson_get_sint(get(get(r, "params"), "minuend")) + yyjson_get_sint(get(r, "id")));
}
return acc;
}
static double pick(const std::string& name, simdjson::dom::element r)
{
double acc = 0;
if (name == "twitter" || name == "status")
{
auto one = [&](simdjson::dom::element s)
{
acc += static_cast<double>(uint64_t(s["id"]));
acc += static_cast<double>(std::string_view(s["user"]["screen_name"]).size());
acc += static_cast<double>(int64_t(s["retweet_count"]));
};
if (name == "twitter")
{
for (auto s : simdjson::dom::array(r["statuses"]))
{
one(s);
}
}
else
{
one(r);
}
}
else if (name == "citm_catalog")
{
for (auto p : simdjson::dom::array(r["performances"]))
{
acc += static_cast<double>(uint64_t(p["id"]) + uint64_t(p["eventId"]) + simdjson::dom::array(p["seatCategories"]).size());
}
acc += static_cast<double>(simdjson::dom::object(r["events"]).size());
}
else if (name == "canada")
{
auto g = r["features"].at(0)["geometry"];
acc += static_cast<double>(std::string_view(r["type"]).size() + std::string_view(g["type"]).size() + simdjson::dom::array(g["coordinates"]).size());
}
else if (name == "jeopardy")
{
for (auto q : simdjson::dom::array(r))
{
acc += std::string_view(q["round"]) == "Final Jeopardy!" ? 1 : 0;
acc += static_cast<double>(std::string_view(q["category"]).size());
}
}
else if (name == "rpc")
{
acc += static_cast<double>(std::string_view(r["method"]).size());
acc += static_cast<double>(int64_t(r["params"]["minuend"]) + int64_t(r["id"]));
}
return acc;
}
static double pick_od(const std::string& name, simdjson::ondemand::document& d)
{
double acc = 0;
if (name == "twitter" || name == "status")
{
auto one = [&](simdjson::ondemand::object s)
{
acc += static_cast<double>(uint64_t(s["id"]));
acc += static_cast<double>(std::string_view(s["user"]["screen_name"]).size());
acc += static_cast<double>(int64_t(s["retweet_count"]));
};
if (name == "twitter")
{
for (auto s : d["statuses"])
{
one(s.get_object());
}
}
else
{
one(d.get_object());
}
}
else if (name == "citm_catalog")
{
simdjson::ondemand::object ev = d["events"].get_object();
acc += static_cast<double>(ev.count_fields());
for (auto p : d["performances"])
{
simdjson::ondemand::object o = p.get_object();
const auto a = uint64_t(o["eventId"]) + uint64_t(o["id"]);
simdjson::ondemand::array sc = o["seatCategories"].get_array();
acc += static_cast<double>(a + sc.count_elements());
}
}
else if (name == "canada")
{
acc += static_cast<double>(std::string_view(d["type"]).size());
auto g = d["features"].at(0)["geometry"];
acc += static_cast<double>(std::string_view(g["type"]).size());
simdjson::ondemand::array co = g["coordinates"].get_array();
acc += static_cast<double>(co.count_elements());
}
else if (name == "jeopardy")
{
for (auto q : d)
{
simdjson::ondemand::object o = q.get_object();
acc += static_cast<double>(std::string_view(o["category"]).size());
acc += std::string_view(o["round"]) == "Final Jeopardy!" ? 1 : 0;
}
}
else if (name == "rpc")
{
acc += static_cast<double>(std::string_view(d["method"]).size());
acc += static_cast<double>(int64_t(d["params"]["minuend"]));
acc += static_cast<double>(int64_t(d["id"]));
}
return acc;
}
// ---------------- harness ----------------
static std::string slurp(const std::string& p)
{
std::ifstream f(p, std::ios::binary);
if (!f)
{
std::fprintf(stderr, "cannot open %s\n", p.c_str());
std::exit(1);
}
std::stringstream ss;
ss << f.rdbuf();
return ss.str();
}
struct engine
{
std::string name;
std::function<void()> fn;
};
int main(int argc, char** argv)
{
if (argc < 2)
{
std::fprintf(stderr, "usage: %s <json_test_data directory> [rounds] [document]\n", argv[0]);
return 1;
}
const std::string T = std::string(argv[1]) + "/";
const int rounds = argc > 2 ? std::atoi(argv[2]) : 30;
const std::string only = argc > 3 ? argv[3] : "";
struct doc
{
std::string name, text;
int batch;
};
std::vector<doc> docs;
for (const char* f :
{"nativejson-benchmark/twitter.json", "nativejson-benchmark/citm_catalog.json", "nativejson-benchmark/canada.json", "jeopardy/jeopardy.json"
})
{
std::string n = std::string(f).substr(std::string(f).find('/') + 1);
docs.push_back({n.substr(0, n.size() - 5), slurp(T + f), 1});
}
docs.push_back({"status", json::parse(docs[0].text)["statuses"][0].dump(), 200});
docs.push_back({"rpc", R"({"jsonrpc": "2.0", "method": "subtract", "params": {"minuend": 42, "subtrahend": 23}, "id": 3})", 5000});
// correctness cross-check of the workloads
for (const auto& dc : docs)
{
stats a, b, c, dd;
walk(json::parse(dc.text), a);
auto d = json_document::parse(dc.text);
walk(d.root(), b);
yyjson_doc* y = yyjson_read(dc.text.data(), dc.text.size(), 0);
walk(yyjson_doc_get_root(y), c);
simdjson::dom::parser p;
walk(p.parse(dc.text).value(), dd);
const bool ok = a.nodes == b.nodes && a.nodes == c.nodes && a.nodes == dd.nodes && a.str == b.str && a.str == c.str && a.str == dd.str
&& std::fabs(a.num - b.num) <= 1e-9 * std::fabs(a.num) && std::fabs(a.num - c.num) <= 1e-9 * std::fabs(a.num);
const double pa = pick(dc.name, json::parse(dc.text)), pb = pick(dc.name, d.root()), pc = pick(dc.name, yyjson_doc_get_root(y)), pd = pick(dc.name, p.parse(dc.text).value());
std::printf("check %-13s traverse %s select %s\n", dc.name.c_str(), ok ? "OK" : "MISMATCH", (pa == pb && pa == pc && pa == pd) ? "OK" : "MISMATCH");
yyjson_doc_free(y);
}
std::FILE* csv = std::fopen("bench_view.csv", "w");
std::fprintf(csv, "doc,bytes,workload,engine,ns\n");
json_document reused;
simdjson::dom::parser sj;
simdjson::ondemand::parser od;
for (const auto& dc : docs)
{
if (!only.empty() && dc.name != only)
{
continue;
}
const std::string& s = dc.text;
const simdjson::padded_string ps(s);
const std::string name = dc.name;
std::vector<std::pair<std::string, std::vector<engine>>> workloads;
workloads.push_back({"parse", {
{"json_view", [&] { auto d = json_document::parse(s); g_sink = static_cast<double>(d.node_count()); }},
{"json_view (reused)", [&] { reused.read(s); g_sink = static_cast<double>(reused.node_count()); }},
{"yyjson", [&] { yyjson_doc* d = yyjson_read(s.data(), s.size(), 0); g_sink = static_cast<double>(yyjson_doc_get_val_count(d)); yyjson_doc_free(d); }},
{"simdjson DOM", [&] { auto e = sj.parse(ps).value_unsafe(); g_sink = e.is_object(); }},
{"simdjson DOM (fresh)", [&] { simdjson::dom::parser p; auto e = p.parse(ps).value_unsafe(); g_sink = e.is_object(); }},
#if JSON_VIEW_BENCH_BOOST
{"Boost.JSON", [&] { boost::json::monotonic_resource mr; auto v = boost::json::parse(s, &mr); g_sink = v.is_object(); }},
#endif
{"json::parse", [&] { json j = json::parse(s); g_sink = static_cast<double>(j.size()); }},
}});
workloads.push_back({"traverse", {
{"json_view", [&] { auto d = json_document::parse(s); stats st; walk(d.root(), st); g_sink = st.num; }},
{"json_view (reused)", [&] { reused.read(s); stats st; walk(reused.root(), st); g_sink = st.num; }},
{"yyjson", [&] { yyjson_doc* d = yyjson_read(s.data(), s.size(), 0); stats st; walk(yyjson_doc_get_root(d), st); g_sink = st.num; yyjson_doc_free(d); }},
{"simdjson DOM", [&] { stats st; walk(sj.parse(ps).value_unsafe(), st); g_sink = st.num; }},
{"simdjson OD", [&] { auto d = od.iterate(ps).value_unsafe(); stats st; walk_od(d.get_value().value_unsafe(), st); g_sink = st.num; }},
#if JSON_VIEW_BENCH_BOOST
{"Boost.JSON", [&] { boost::json::monotonic_resource mr; auto v = boost::json::parse(s, &mr); stats st; walk(v, st); g_sink = st.num; }},
#endif
{"json::parse", [&] { json j = json::parse(s); stats st; walk(j, st); g_sink = st.num; }},
}});
workloads.push_back({"select", {
{"json_view", [&] { auto d = json_document::parse(s); g_sink = pick(name, d.root()); }},
{"json_view (reused)", [&] { reused.read(s); g_sink = pick(name, reused.root()); }},
{"yyjson", [&] { yyjson_doc* d = yyjson_read(s.data(), s.size(), 0); g_sink = pick(name, yyjson_doc_get_root(d)); yyjson_doc_free(d); }},
{"simdjson DOM", [&] { g_sink = pick(name, sj.parse(ps).value_unsafe()); }},
{"simdjson OD", [&] { auto d = od.iterate(ps).value_unsafe(); g_sink = pick_od(name, d); }},
{"json::parse", [&] { json j = json::parse(s); g_sink = pick(name, j); }},
}});
{
// serialization of an already parsed document
static json_document vd;
vd.read(s);
static yyjson_doc* yd = nullptr;
if (yd)
{
yyjson_doc_free(yd);
}
yd = yyjson_read(s.data(), s.size(), 0);
static simdjson::dom::parser sjd;
static simdjson::dom::element se;
se = sjd.parse(ps).value_unsafe();
static json jd;
jd = json::parse(s);
workloads.push_back({"dump", {
{"json_view", [&] { std::string o = vd.root().dump(); g_sink = static_cast<double>(o.size()); }},
{"yyjson", [&] { std::size_t n = 0; char* o = yyjson_write(yd, 0, &n); g_sink = static_cast<double>(n); std::free(o); }},
{"simdjson DOM", [&] { std::string o = simdjson::to_string(se); g_sink = static_cast<double>(o.size()); }},
{"json::parse", [&] { std::string o = jd.dump(); g_sink = static_cast<double>(o.size()); }},
}});
}
for (auto& wl : workloads)
{
std::vector<double> best(wl.second.size(), 1e300);
const int r = s.size() > 10000000 ? std::max(3, rounds / 5) : rounds;
for (int i = 0; i < r; ++i)
{
for (std::size_t k = 0; k < wl.second.size(); ++k)
{
// an untimed call first: whatever the previous engine left to the allocator
// (e.g. thousands of freed json nodes) is cleaned up here, not in the timing
wl.second[k].fn();
const auto t0 = std::chrono::steady_clock::now();
for (int b = 0; b < dc.batch; ++b)
{
wl.second[k].fn();
}
const double ns = std::chrono::duration<double, std::nano>(std::chrono::steady_clock::now() - t0).count() / dc.batch;
best[k] = std::min(best[k], ns);
}
}
const double ref = best[0];
std::printf("%-13s %-9s", dc.name.c_str(), wl.first.c_str());
for (std::size_t k = 0; k < wl.second.size(); ++k)
{
const double us = best[k] / 1e3;
std::printf(" %s %s%s (%.2fx)", wl.second[k].name.c_str(), us >= 100 ? "" : "", (us >= 1000 ? std::to_string(static_cast<long>(us)) + "us" : (std::to_string(us).substr(0, 5) + "us")).c_str(), best[k] / ref);
std::fprintf(csv, "%s,%zu,%s,%s,%.1f\n", dc.name.c_str(), s.size(), wl.first.c_str(), wl.second[k].name.c_str(), best[k]);
}
std::printf("\n");
std::fflush(stdout);
}
}
std::fclose(csv);
}
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