rpds VS moodycamel

Compare rpds vs moodycamel and see what are their differences.


A fast multi-producer, multi-consumer lock-free concurrent queue for C++11 (by cameron314)
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rpds moodycamel
3 11
1,045 8,236
- -
0.0 0.0
8 days ago 3 months ago
Rust C++
Mozilla Public License 2.0 GNU General Public License v3.0 or later
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.


Posts with mentions or reviews of rpds. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-07-23.
  • Learning Clojure made me return back to C/C++
    8 projects | /r/Clojure | 23 Jul 2021
    Thanks for taking the time to provide a detailed response. Need to think on this. I had actually started a regular Clojure parser using LLVM as a hobby, but then my friend said it was better to implement this in a safe-memory and. save-concurrency language like Rust and leverage cranelift for code generation. So, now I am learning rust, lol. (Btw, Rust has a persistent data structures lib too: https://github.com/orium/rpds )
  • Persisting data that has revisions for values
    3 projects | /r/rust | 19 May 2021
    Take a look at https://github.com/orium/rpds or one of the many others.


Posts with mentions or reviews of moodycamel. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-04-21.
  • moodycamel VS lockfree_mpmc_queue - a user suggested alternative
    2 projects | 21 Apr 2022
  • Matthias Killat - Lock-free programming for real-time systems - Meeting C++ 2021
    2 projects | /r/cpp | 22 Jan 2022
    Not literatue but an example. This is a lock-free (not wait-free!) multi-producer multi-consumer queue, not a FIFO, but access patterns should be similar - if not the same: https://github.com/cameron314/concurrentqueue
  • Learning Clojure made me return back to C/C++
    8 projects | /r/Clojure | 23 Jul 2021
    If I do implement it, the most likely route I'd take is make a compiler in Clojure/clojurescript that uses Instaparse (I have a more-or-less-clojure grammar written that I was tinkering with) and generate C++ code that uses Immer for its data structures and Zug for transducers and what my not-quite-clojure would support would be heavily dependent on what the C++ code and libraries I use can do. I'd use Taskflow to implement a core.async style system (not sure how to implement channels, maybe this but I'm unsure if its a good fit, but I also haven't looked). I would ultimately want to be able to interact with C++ code, so having some way to call C++ classes (even templated ones) would be a must. I'm unsure if I would just copy (and extend as needed) Clojure's host interop functionality or not. I had toyed with the idea that you can define the native types (including templates) as part of the type annotations and then the user-level code basically just looks like a normal function. But I didn't take it very far yet, haven't had the time. The reason I'd take this approach is that I'm writing a good bit of C++ again and I'd love to do that in this not-quite-clojure language, if I did make it. A bunch of languages, like Haxe and Nim compile to C or C++, so I think its a perfectly reasonable approach, and if interop works well enough, then just like Clojure was able to leverage the Java ecosystem, not-quite-clojure could be bootstrapped by leveraging the C++ ecosystem. But its mostly just a vague dream right now.
  • Recommendations for C++ library for shared memory (multiple producers/single consumer)
    3 projects | /r/cpp | 28 May 2021
    I would recommend https://github.com/cameron314/concurrentqueue as it's very battle tested and fast.
  • fmtlog: fastest C++ logging library using fmtlib syntax
    2 projects | /r/cpp | 6 May 2021
    This was explicitly considered for spdlog (using the moodycamel::ConcurrentQueue) but rejected for the above reason. I'm not involved in the development of spdlog but personally I agree, for me it's important that log output is not all mixed up.
  • Functional programming in C++ (2012)
    2 projects | news.ycombinator.com | 28 Dec 2020
    > So the big win with functional programming is easier testibility and fewer hazards when trying to multi-thread your code.

    To give you my experience: during my phd, I developed https://ossia.io in C++. For the manuscript redaction, I rewrote all the core algorithms in pure functional OCaml. When I did some tests, performance was slower than -O0 C++ (so it's not even a given that multithreaded OCaml would outperform single-thread C++), the tests weren't meaningfully simpler to write, and it would be pretty much impossible to have an average comp. sci. student contribute to the code.

    My experience multi-threading C++ code is, "slap cpp-taskflow, TBB, RaftLib" or any kind of threaded task system and enjoy arbitrary scaling. Hardly the pain it is made to be unless you have a need to go down to std::thread level, but even then using something like https://github.com/cameron314/concurrentqueue to communicate between threads makes things extremely painless.

What are some alternatives?

When comparing rpds and moodycamel you can also consider the following projects:

Boost.Compute - A C++ GPU Computing Library for OpenCL

MPMCQueue.h - A bounded multi-producer multi-consumer concurrent queue written in C++11

readerwriterqueue - A fast single-producer, single-consumer lock-free queue for C++

Taskflow - A General-purpose Parallel and Heterogeneous Task Programming System

RaftLib - The RaftLib C++ library, streaming/dataflow concurrency via C++ iostream-like operators

libcds - A C++ library of Concurrent Data Structures

Thrust - The C++ parallel algorithms library.

junction - Concurrent data structures in C++

C++ Actor Framework - An Open Source Implementation of the Actor Model in C++

ck - Concurrency primitives, safe memory reclamation mechanisms and non-blocking (including lock-free) data structures designed to aid in the research, design and implementation of high performance concurrent systems developed in C99+.

shm_ring_buffer - Shared-memory based ring buffer

libmill - Go-style concurrency in C