moodycamel
readerwriterqueue
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moodycamel | readerwriterqueue | |
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11 | 4 | |
8,729 | 3,400 | |
- | - | |
3.9 | 1.0 | |
9 months ago | 2 months ago | |
C++ | C++ | |
GNU General Public License v3.0 or later | GNU General Public License v3.0 or later |
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moodycamel
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moodycamel VS lockfree_mpmc_queue - a user suggested alternative
2 projects | 21 Apr 2022
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Matthias Killat - Lock-free programming for real-time systems - Meeting C++ 2021
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
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Learning Clojure made me return back to C/C++
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.
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Recommendations for C++ library for shared memory (multiple producers/single consumer)
I would recommend https://github.com/cameron314/concurrentqueue as it's very battle tested and fast.
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fmtlog: fastest C++ logging library using fmtlib syntax
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.
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Functional programming in C++ (2012)
> 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.
readerwriterqueue
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MPMC suggestions where messages are sent to all consumers ?
I have looked at the commonly recommended - https://github.com/cameron314/readerwriterqueue - https://github.com/rigtorp/MPMCQueue
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How to figure out the cause of my pi 4 crashing?
The PREEMPT error looks like its a C module but I cannot tell from he little snippet of the log - you may do better to move the *arr and Synchthing into Docker containers to keep the OS cleaner.
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Qt 6.3 Released
For audio DSP in a Qt app I have good success with using a lock-free queue (e.g. https://github.com/cameron314/readerwriterqueue) to communicate from / to the UI threads. Code more-or-less looks like
connect(model, &ModelObject::somethingChanged, [=] {
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ConorWilliams/ConcurrentDeque
We recently removed readerwriterqueue from our project due to issues and replaced with simple locking queue (and got better performance in the result). Your code looks interesting, but we can't use it due to C++17 usage.
What are some alternatives?
Boost.Compute - A C++ GPU Computing Library for OpenCL
MPMCQueue.h - A bounded multi-producer multi-consumer concurrent queue written in C++11
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 - [ARCHIVED] The C++ parallel algorithms library. See https://github.com/NVIDIA/cccl
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
SPSCQueue.h - A bounded single-producer single-consumer wait-free and lock-free queue written in C++11