feat: add with_capacity for ReaderStream

[ttys3]

Motivation

I try to build a static file server with axum + tower-http, and decide to improve tower-http's file sending speed with tokio-util's ReaderStream.

But did not find a way to cutomized the buf chunk size.

With tokio-util's default 4096 buf chunk size, the static server can only stable at 50MiB/s

so I try to increase the buf chunk size to 8K, 32K, 64K and the speed got improved to > 200MiB/s

but by default, there's no with_capacity method, so I have to use crate patch.

Solution

add with_capacity

Related

#2215

[Darksonn]

Thanks.

[ttys3]

CI / test tokio full --unstable (macos-latest) (pull_request) Cancelled after 360m, need a restart ?