How to efficiently handle large binary data streams with `tokio` and `bytes` in Rust?
I'm experimenting with I'm working on a personal project and I'm trying to build a Rust application that needs to handle large binary data streams efficiently... I'm using `tokio` for asynchronous I/O operations and the `bytes` crate for managing byte buffers. My concern is with memory usage and performance when processing these streams. When I receive a large chunk of data, I would like to minimize memory allocations and deallocations but I'm running into issues with buffering. Here's a simplified version of the code I have so far: ```rust use tokio::io::{AsyncReadExt, AsyncWriteExt}; use bytes::{BufMut, BytesMut}; const BUFFER_SIZE: usize = 8192; async fn process_stream<R: AsyncReadExt + Unpin>(reader: &mut R) -> std::io::Result<()> { let mut buffer = BytesMut::with_capacity(BUFFER_SIZE); loop { // Read data into the buffer let n = reader.read_buf(&mut buffer).await?; if n == 0 { break; // EOF } // Process the data in the buffer // ... (processing logic goes here) // Here lies the scenario: I want to clear the buffer efficiently buffer.advance(n); // Move the cursor forward } Ok(()) } ``` While this seems straightforward, I noticed that when processing larger data streams, the memory usage spikes. I suspect that the `BytesMut` allocation strategy is leading to too many allocations. I've also tried using `buffer.split()` to process chunks independently, but that doesn't seem to handle the overall memory cost effectively either. Is there a better pattern or approach in Rust to handle this situation without incurring high memory overhead? Are there specific techniques in `tokio` or the `bytes` crate that I should be using to improve performance and memory efficiency? I'm currently using `tokio` version 1.20 and `bytes` version 1.1. I appreciate any insights or examples that could guide to refactor this part of my code. I'm working on a CLI tool that needs to handle this. What's the best practice here? This is my first time working with Rust 3.11. Any suggestions would be helpful. I'd love to hear your thoughts on this.