Jsonic vs the world

main.cpp

#include <boost/json.hpp>

#include <QDebug>
#include <QElapsedTimer>
#include <QFile>

#include "jsonic.c"
#include "jsonic.h"

#include "fmt/format.h"

#include "simdjson.h"
#include <iostream>
using namespace simdjson;

namespace bj = boost::json;
using namespace std;

int main(int argc, char* argv[]) {
	QFile canada("canada.json");
	canada.open(QFile::ReadOnly);

	auto   buffer = canada.readAll().toStdString();
	string path   = "/features/0/geometry/coordinates";

	{

		bj::monotonic_resource mr;

		QElapsedTimer timer;
		timer.start();
		auto jv = bj::parse(buffer, &mr);
		auto t1 = timer.nsecsElapsed();

		auto& coordinates = jv.at_pointer(path).as_array();
		auto  size        = coordinates.size();
		auto  t2          = timer.nsecsElapsed();

		uint total = 0;
		for (auto& inner : coordinates) {
			total += inner.as_array().size();
		}
		auto t3 = timer.nsecsElapsed();

		fmt::print(R"(
Boost.Json
{:<33}:{:>10}ns
{:<33}:{:>10}ns
{:<33}:{:>10}ns
{:<33}:{:>10}
{:<33}:{:>10}
)",
		           "Initial Read", t1,
		           "feature/0/geometry lenght", t2,
		           "feature/0/geometry unrolling", t3,
		           "external lenght", size,
		           "total number of element", total);
	}

	{
		QElapsedTimer timer;

		char* copy = buffer.data();
		timer.start();
		jsonic_node_t* root          = jsonic_get_root(copy);
		auto           t1            = timer.nsecsElapsed();
		jsonic_node_t* features      = jsonic_object_get(copy, root, "features");
		auto           t2            = timer.nsecsElapsed();
		jsonic_node_t* feature       = jsonic_array_get(copy, features, 0);
		auto           t3            = timer.nsecsElapsed();
		jsonic_node_t* geometry      = jsonic_object_get(copy, feature, "geometry");
		auto           t4            = timer.nsecsElapsed();
		jsonic_node_t* coordinates   = jsonic_object_get(copy, geometry, "coordinates");
		auto           t5            = timer.nsecsElapsed();
		int            coords_length = jsonic_array_length(copy, coordinates);
		auto           t6            = timer.nsecsElapsed();

		uint           total = 0;
		jsonic_node_t* coord = NULL;
		for (;;) {
			coord = jsonic_array_iter(copy, coordinates, coord, 0);
			//coord = jsonic_array_iter_free(copy, coordinates, coord, 0);
			if (coord->type == JSONIC_NONE)
				break;

			total += jsonic_array_length(copy, coord);
		}
		auto t7 = timer.nsecsElapsed();

		fmt::print(R"(
JSONIC
{:<33}:{:>10}ns
{:<33}:{:>10}ns
{:<33}:{:>10}ns
{:<33}:{:>10}ns
{:<33}:{:>10}ns
{:<33}:{:>10}ns
{:<33}:{:>10}ns
{:<33}:{:>10}
{:<33}:{:>10}
)",
		           "Initial Read", t1,
		           "Feature", t2,
		           "feature/0", t3,
		           "feature/0/geometry", t4,
		           "feature/0/geometry/coordinates", t5,
		           "feature/0/geometry lenght", t6,
		           "feature/0/geometry unrolling", t7,
		           "external lenght", coords_length,
		           "total number of element", total);
	}

	{
		ondemand::parser parser;
		padded_string    json = padded_string::load("canada.json");
		QElapsedTimer    timer;
		timer.start();
		ondemand::document canada = parser.iterate(json);
		auto               t1     = timer.nsecsElapsed();
		uint               size   = 0;
		uint               total  = 0;
		for (auto&& v : canada.at_pointer(path).get_array()) {
			size++;
			for (auto&& v2 : v.get_array()) {
				total++;
			}
		}
		auto t2 = timer.nsecsElapsed();

		fmt::print(R"(
SIMD Json
{:<33}:{:>10}ns
{:<33}:{:>10}ns
{:<33}:{:>10}
{:<33}:{:>10}
)",
		           "Initial Read", t1,
		           "feature/0/geometry lenght", t2,
		           "external lenght", size,
		           "total number of element", total);
	}
}

Meowww...

Nid moar alignement!

Ciao, I have not used the make file you provided, and just #included both the C file to help the LTO https://gcc.gnu.org/onlinedocs/gccint/LTO-Overview.html so it was compiled already in O3.

So you are telling me that the slow part of json parsing is producing the dom, and probably for small size json, where you have to just read once some value, is just better to process on the fly...

So even if you have to count an element in a 2Mb json file near the end, is still better unrolling 400+ array before him...

Instead I will give a look to the other mod you have done, and redo the test above, and remove the qt dependency so you can execute easily on your side.

Meowwww....

I can just write a "full read and return everything as a whole" function in 5 mins with iteration functions and it will provide a fixed good performance.

But.... I don't wanna do that; there are a lot of slow libraries that do that already.. why would I simply do that without an iteration ecosystem?

This one can already parse everything with array iteration functions and object/KV iteration functions. So it will result the same to all decent libraries; but why? It is different and advanced with iteration ecosystem. 😊

Purrr