postcard
speedy
postcard | speedy | |
---|---|---|
7 | 1 | |
708 | 331 | |
- | - | |
5.9 | 5.9 | |
13 days ago | 3 months ago | |
Rust | Rust | |
Apache License 2.0 | Apache License 2.0 |
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postcard
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Best format for high-performance Serde?
I've been enjoying postcard as a lightweight efficient binary serialization.
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Ractor: not just another actor framework
That said, postcard is not a self describing format (so everyone needs the same schema, no changes allowed), but I do have a tracking issue open for ways to handle this in the future.
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Are there any serialization crates that do Varint encoding without Zigzag encoding?
For example, look at the Postcard serializer for inspiration.
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Hey Rustaceans! Got a question? Ask here! (51/2022)!
Serde should be no_std, I have used it embedded with crates such as postcard. You can see how postcard disables default features of serde here : https://github.com/jamesmunns/postcard/blob/main/Cargo.toml
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jemi: a compact JSON serializer for embedded systems
Another option that may work for some is SerDe on rust. You just write a struct with the fields you want #[derive(Serialize, Deserialize)] above it, and if codegens the functions to deserialize that struct from JSON and serialize it back. Example looks like this https://docs.rs/serde_json/latest/serde_json/#creating-json-by-serializing-data-structures (but you have to use serde-json-core if you don’t have an allocator). Can also easily reserialize to something small like postcard that’s meant for embedded storage.
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Karmem: A fast binary serialization format faster than Google Flatbuffers
https://github.com/jamesmunns/postcard
postcard seems like it would be particularly strong for the wasm use case as it produces small messages that are light in memory.
speedy
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Are there any serialization crates that do Varint encoding without Zigzag encoding?
I would look at speedy which is, as the name suggests, pretty fast. It encodes varints in a way that's different from LEB128, and is much quicker to both encode and decode. The format they use is at the top of this file -- you can do it just with a couple of shifts and masks, and decoding is similarly fast. Speedy also hard-branches in the code with a switch statement based on how many bytes you need, which in my tests is something like 2x faster than the alternative, despite it being a branch (it's just turns into a lookup table in assembly).
What are some alternatives?
tinycbor - Concise Binary Object Representation (CBOR) Library
scale-info - Info about SCALE encodable Rust types
karmem - Karmem is a fast binary serialization format, faster than Google Flatbuffers and optimized for TinyGo and WASM.
ssh_format - Data format used to communicate with openssh mux server.
ractor - Rust actor framework
serde - Serialization framework for Rust
json-maker - C library used to code JSON objects in null-terminated strings
pguint - unsigned integer types extension for PostgreSQL
tiny-json - The tiny-json is a versatile and easy to use json parser in C suitable for embedded systems. It is fast, robust and portable.
parity-scale-codec - Lightweight, efficient, binary serialization and deserialization codec
cJSON - Ultralightweight JSON parser in ANSI C
xml-rs - An XML library in Rust