simdjson VS daw_json_link

Compare simdjson vs daw_json_link and see what are their differences.

simdjson

Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks (by simdjson)
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simdjson daw_json_link
63 21
18,275 421
1.9% -
9.2 8.6
8 days ago 1 day ago
C++ C++
Apache License 2.0 Boost Software License 1.0
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

simdjson

Posts with mentions or reviews of simdjson. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2024-03-09.
  • 1BRC Merykitty's Magic SWAR: 8 Lines of Code Explained in 3k Words
    4 projects | news.ycombinator.com | 9 Mar 2024
  • Training great LLMs from ground zero in the wilderness as a startup
    3 projects | news.ycombinator.com | 6 Mar 2024
  • Use any web browser as GUI, with Zig in the back end and HTML5 in the front end
    17 projects | news.ycombinator.com | 1 Jan 2024
    String parsing is negligible compared to the speed of the DOM which is glacially slow: https://news.ycombinator.com/item?id=38835920

    Come on, people, make an effort to learn how insanely fast computers are, and how insanely inefficient our software is.

    String parsing can be done at gigabytes per second: https://github.com/simdjson/simdjson If you think that is the slowest operation in the browser, please find some resources that talk about what is actually happening in the browser?

  • Cray-1 performance vs. modern CPUs
    4 projects | news.ycombinator.com | 25 Dec 2023
    Thanks for all the detailed information! That answers a bunch of my questions and the implementation of strlen is nice.

    The instruction I was thinking of is pshufb. An example ‘weird’ use can be found for detecting white space in simdjson: https://github.com/simdjson/simdjson/blob/24b44309fb52c3e2c5...

    This works as follows:

    1. Observe that each ascii whitespace character ends with a different nibble.

    2. Make some vector of 16 bytes which has the white space character whose final nibble is the index of the byte, or some other character with a different final nibble from the byte (eg first element is space =0x20, next could be eg 0xff but not 0xf1 as that ends in the same nibble as index)

    3. For each block where you want to find white space, compute pcmpeqb(pshufb(whitespace, input), input). The rules of pshufb mean (a) non-ascii (ie bit 7 set) characters go to 0 so will compare false, (b) other characters are replaced with an element of whitespace according to their last nibble so will compare equal only if they are that whitespace character.

    I’m not sure how easy it would be to do such tricks with vgather.vv. In particular, the length of the input doesn’t matter (could be longer) but the length of white space must be 16 bytes. I’m not sure how the whole vlen stuff interacts with tricks like this where you (a) require certain fixed lengths and (b) may have different lengths for tables and input vectors. (and indeed there might just be better ways, eg you could imagine an operation with a 256-bit register where you permute some vector of bytes by sign-extending the nth bit of the 256-bit register into the result where the input byte is n).

  • Codebases to read
    5 projects | /r/cpp | 5 Dec 2023
    Additionally, if you like low level stuff, check out libfmt (https://github.com/fmtlib/fmt) - not a big project, not difficult to understand. Or something like simdjson (https://github.com/simdjson/simdjson).
  • Building a high performance JSON parser
    19 projects | news.ycombinator.com | 5 Nov 2023
    Everything you said is totally reasonable. I'm a big fan of napkin math and theoretical upper bounds on performance.

    simdjson (https://github.com/simdjson/simdjson) claims to fully parse JSON on the order of 3 GB/sec. Which is faster than OP's Go whitespace parsing! These tests are running on different hardware so it's not apples-to-apples.

    The phrase "cannot go faster than this" is just begging for a "well ackshully". Which I hate to do. But the fact that there is an existence proof of Problem A running faster in C++ SIMD than OP's Probably B scalar Go is quite interesting and worth calling out imho. But I admit it doesn't change the rest of the post.

    19 projects | news.ycombinator.com | 5 Nov 2023
    The walkthrough is very nice, how to do this if you're going to do it.

    If you're going for pure performance in a production environment you might take a look at Daniel Lemire's work: https://github.com/simdjson/simdjson. Or the MinIO port of it to Go: https://github.com/minio/simdjson-go.

    19 projects | news.ycombinator.com | 5 Nov 2023
  • New package : lspce - a simple LSP Client for Emacs
    4 projects | /r/emacs | 30 Jun 2023
    I have same question as /u/JDRiverRun : how do you deal with JSON, do you parse json on Rust side or on Emacs side. I see that you are requiring json.el in your lspce.el, but I haven't looked through entire file carefully. If you parse on Rust side, do you use simdjson (there are at least two Rust bindings to it)? If yes, what are your impressions, experiences compared to more "standard" json library?
  • Any fresh jvm21 benchmarks ?
    2 projects | /r/java | 21 May 2023
    I expect a lot of transcoders will be rewritten when the Vector instructions land. You can see speedups when used in other languages, such as simdjson. Please try to be more thoughtful and not disregard other people's hard work so easily.

daw_json_link

Posts with mentions or reviews of daw_json_link. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-04-27.
  • Has Boost lost its charm?
    3 projects | /r/cpp | 27 Apr 2023
    They might have good luck with https://github.com/beached/daw_json_link it has support for stuff like JSON lines and alike plus other ways that only use as much ram as their underlying data structures do as it parses directly to the user DS. Plus it has an iterator/range interface for things like arrays if needed.
  • New, fastest JSON library for C++20
    8 projects | /r/cpp | 13 Oct 2022
    We will add more benchmarks in the future, but for now you can see the comparison of daw_json_link with rapidjson. glaze is faster than daw_json_link, which is over twice as fast as rapidjson.
  • What are some cool modern libraries you enjoy using?
    32 projects | /r/cpp | 18 Sep 2022
    I am biased, but prefer https://github.com/beached/daw_json_link Super fast and you work with your native data structures without the overhead of DOM parsing/lookup
  • How to deserialise json into a C++ struct?
    2 projects | /r/cpp_questions | 16 Sep 2022
    You can also look into https://github.com/beached/daw_json_link which claims to support nullable values in the readme.
  • Show HN: DAW JSON Link
    4 projects | news.ycombinator.com | 12 Aug 2022
  • JSON for Modern C++ 3.11.0
    7 projects | /r/cpp | 1 Aug 2022
    The library I author does this. https://github.com/beached/daw_json_link . It's fast, GB/s too, and provides the mapping mechanism, iteration types, json lines support, event based parser, along with a non-owning json_value for when the mappings don't fit right or if one is querying. Pretty much everything but an owning JSON value as it's not something I've ever needed more than temporarily and brings a lot of complexity that is solved by using the actual C++ data structures one is eventually parsing into anyways.
    7 projects | /r/cpp | 1 Aug 2022
    Unless you need to be very specific about the error handling, I believe that probably something like this would better serve your purpose and requires you less boilerplate.
  • DAW JSON Link v3, a JSON serialization/deserialization library, is released
    10 projects | /r/cpp | 1 Jul 2022
    So DAW JSON Link does have a DOM view, however it does not have a owning view. The json_value(even supports JSON Path in a limited form) type and json_raw mappings can help here. But there is no hard line between parsing view the json_value and the mappings to concrete data structures. One can mix and match.
    10 projects | /r/cpp | 1 Jul 2022
  • Is there something like GSON available in C++?
    3 projects | /r/cpp | 20 May 2022
    daw_json_link is what you're looking for : https://github.com/beached/daw_json_link

What are some alternatives?

When comparing simdjson and daw_json_link you can also consider the following projects:

RapidJSON - A fast JSON parser/generator for C++ with both SAX/DOM style API

jsoniter - jsoniter (json-iterator) is fast and flexible JSON parser available in Java and Go

json - JSON for Modern C++

json-schema-validator - JSON schema validator for JSON for Modern C++

JsonCpp - A C++ library for interacting with JSON.

json - A C++11 library for parsing and serializing JSON to and from a DOM container in memory.

sonic - A blazingly fast JSON serializing & deserializing library

json_struct - json_struct is a single header only C++ library for parsing JSON directly to C++ structs and vice versa

json-c - https://github.com/json-c/json-c is the official code repository for json-c. See the wiki for release tarballs for download. API docs at http://json-c.github.io/json-c/

jsoncons - A C++, header-only library for constructing JSON and JSON-like data formats, with JSON Pointer, JSON Patch, JSON Schema, JSONPath, JMESPath, CSV, MessagePack, CBOR, BSON, UBJSON

zed - A novel data lake based on super-structured data

json11