libuv
C++ Actor Framework
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libuv | C++ Actor Framework | |
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75 | 4 | |
23,065 | 3,074 | |
1.3% | 0.7% | |
9.1 | 9.8 | |
8 days ago | 7 days ago | |
C | C++ | |
MIT License | BSD 3-clause "New" or "Revised" License |
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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.
libuv
- Epoll: The API that powers the modern internet (2022)
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APIs in Go with Huma 2.0
I wound up on a different team with pre-existing Python code so temporarily shelved my use of Go for a bit, and we used Sanic (an async Python framework built on top of the excellent uvloop & libuv that also powers Node.js) to build some APIs for live channel management & operations. We hand-wrote our OpenAPI and used it to generate documentation and a CLI, which was an improvement over what was there (or not) before. Other teams used the OpenAPI document to generate SDKs to interact with our service.
- Python Is Easy. Go Is Simple. Simple = Easy
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Notes: Advanced Node.js Concepts by Stephen Grider
In the source code of the Node.js opensource project, lib folder contains JavaScript code, mostly wrappers over C++ and function definitions. On the contrary, src folder contains C++ implementations of the functions, which pulls dependencies from the V8 project, the libuv project, the zlib project, the llhttp project, and many more - which are all placed at the deps folder.
- A Magia do Event Loop
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What is Node.js?: A Complete Guide
Node.js is written in C, C++, and JavaScript. The core components of Node.js - the V8 engine and the libuv library - are written in C++ and C, respectively, since these languages provide low-level access to system resources, making them well-suited for building high-performance and efficient applications. JavaScript is mainly used to write the application logic.
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Using Parallel Processing in Node.js and its Limitations
Well, the single-threaded nature ultimately leads to its biggest downfall. Node.js utilizes a synchronous event loop engineered using Libuv that takes in code from the call stack and executes it.
- io_uring support for libuv – 8x increase in throughput
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7 Tips to Build Scalable Node.js Applications
Node.js executes JavaScript code in a single-threaded model. However, Node.js can function as a multithreaded framework by utilizing the libuv C library to create hidden threads (see the event loop) which handle I/O operations, and network requests asynchronously. But, CPU-intensive tasks such as image or video processing can block the event loop and prevent subsequent requests from executing, increasing the application's latency.
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Use io_uring for network I/O
Hat's off for posting this 2 hours after it dropped!
I've been tracking the nest of issues with anticipation! This wasn't linked to https://github.com/libuv/libuv/pull/1947 when it posted, so I didn't see it. Very glad you linked it, thanks!
C++ Actor Framework
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C++ Jobs - Q3 2023
CAF
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Actor system for the JVM developed by Electronic Arts
I'd like to mention the native actor model implementation CAF, the C++ Actor Framework, and share some experiences. (Disclaimer: I've been developing on CAF in the past and have a good relationship with the creator.) CAF (1) provides native actors without an VM layer, (2) type-safe interfaces so that the compiler yells at you when a receiver cannot handle a message, and (3) transparent copy-on-write messaging so that you can still push stuff through pipelines and induce only copies only when a ref count is greater than one.
In our telemetry engine VAST, we've been using CAF successfully for several years for building a distributed system that always has a saturated write path. CAF provides a credit-based streaming abstraction as well, so that you can have backpressure across a chain of actors, making burst-induced OOM issues a blast from the past. You also get all the other benefits of actors, like linking and monitoring, to achieve well-defined failure semantics: either be up and running or collectively fail, but still allowing for local recovery—except for segfaults, this is where "native" has a disadvantage over VM-based actor models.
With CAF's network transparent runtime, a message ender doesn't need to know where receiver lives; the runtime either passes the message as COW pointer to the receiver or serializes it transparently. Other actor model runtimes support that as well, but I'm mentioning it because our experience showed that this is great value: we can can slice and dice our actors based on the deployment target, e.g., execute the application in one single process (e.g., for a beefy box) or wrap actors into single OS processes (e.g., when deploying on container auto-scalers).
The deep integration with the C++ type system allowed us to define very stable RPC-like interfaces. We're currently designing a pub/sub layer as alternate access path, because users are interested in tapping into streaming feeds selectively. This is not easy, because request-response and pub/sub are two ends of a spectrum, but it turns out we can support nicely with CAF.
Resources:
- CAF: https://github.com/actor-framework/actor-framework
- VAST: https://tenzir.github.io/vast/docs/understand-vast/actor-mod... (sorry for the incompleteness, we're in migration mode from the old docs, but this page is summarizing the benefits of CAF for us best)
- Good general actor model background: http://dist-prog-book.com/chapter/3/message-passing.html#why...
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C++ Jobs - Q2 2022
VAST is a flight recorder and security content execution engine. On the one hand, there exists a continuous stream of high-volume data sources (such as network telemetry as NetFlow, Zeek, Suricata, and endpoint telemetry). On the other hand, VAST processes needle-in-haystack queries to provide answers to questions like "has this threat been relevant to us 8 months ago?", and supports threat hunters with an interactive query capability to explore the data. From an engineering perspective, we focus especially on the separation of read and write path, concurrent message passing in an actor model runtime (CAF), and leveraging open standards, like Apache Arrow, to establish a high-bandwidth data plane for sharing data with downstream tooling. A flexible plugin API enables additional security-specific use cases on top, such as realtime matching of threat intelligence or mining of asset data for passive inventorization.
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C++ Jobs - Q4 2021
Technologies: Apache Arrow, Flatbuffers, C++ Actor Framework, Linux, Docker, Kubernetes
What are some alternatives?
libevent - Event notification library
Boost.Asio - Asio C++ Library
libev - Full-featured high-performance event loop loosely modelled after libevent
tokio-uring - An io_uring backed runtime for Rust
uvw - Header-only, event based, tiny and easy to use libuv wrapper in modern C++ - now available as also shared/static library!
benchmarks - Some benchmarks of different languages
Taskflow - A General-purpose Parallel and Heterogeneous Task Programming System
rotor - Event loop friendly C++ actor micro-framework, supervisable
asyncio - asyncio is a c++20 library to write concurrent code using the async/await syntax.
librespot - Open Source Spotify client library