Unbuffered I/O Can Make Your Rust Programs Much Slower

• h264-reader

  1 57 7.2 Rust

  Rust reader for H264 bitsream syntax

Recommended by whom?

When you want to process stuff in bulk, it's better to use BufRead::fill_buf (reusing the BufRead's buffer) rather than copy into your own.

For example, I wrote some code which basically skips some escape bytes. [1] It wraps a BufRead and is itself a BufRead. Its caller actually can read straight from the buffer you supply, skipping two layers of copying.

[1] https://github.com/dholroyd/h264-reader/blob/60ed66dc4dbfe74...

• json

  41 4,517 8.8 Rust

  Strongly typed JSON library for Rust (by serde-rs)

  

For what it's worth, if you want the best performance out of Serde you have to use from_str or from_slice, regardless of if you pass a BufRead to it.

https://github.com/serde-rs/json/issues/160

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