Reading files in rust

Nunc nec metus tincidunt, bibendum tortor id, imperdiet mauris. Vivamus luctus, magna vel fringilla pellentesque, dolor sapien ornare tortor, sed aliquet leo turpis eu purus. Vivamus varius viverra consequat. Latest Articles. Similar Articles. In fact it meant that the fastest one tokei was suddenly faster than my scc for almost all tests. In addition a new project polyglot written in a language I have never heard of ATS popped up which is also now faster than my Go program for any repository when running on a machine with less than 8 cores.

I looked a little further into scc to determine if I could improve the performance at all and came away unconvinced. There was little opportunity as far as I could see to make it run faster. It still holds the performance crown on Windows however. During this process I tried running it compared to tokei on a 32 core machine with 50 copies of the linux kernel. In this test tokei showed an interesting characteristic. It started by using only a few of the cores then after a brief period maxed out all of them.

By contrast scc started by maxing out every core it could from the moment it started. This suggests that tokei started by walking the file system, then processing every file once that process was done. By contrast I had designed scc to walk the file system and process each file as it went by chaining Go streams.

This suggests that as one might expect for tight loops which code counting is Rust is not just faster than Go but considerably faster. Does not mean its not possible, but I doubt I have enough skill to do so. Seeing as I wanted to learn Rust anyway it seemed like a good idea to attempt to port scc into Rust, and learn if scc would have been faster if so. Learn more. What's the de-facto way of reading and writing files in Rust 1. Ask Question. Asked 6 years, 6 months ago.

Active 3 months ago. Viewed 88k times. Improve this question. Shepmaster k 60 60 gold badges silver badges bronze badges. Jared Jared 3, 2 2 gold badges 19 19 silver badges 26 26 bronze badges. How do you want to read the file? Do you want it line-by-line, as you've shown? Do you want it all in one string? There's more than one way to "read a file". Either manner is fine. I left it open intentionally. Add a comment. Different methods can be used, each one having its own drawbacks. If you're familiar with Python or Ruby, this method is as convenient as Python's read function or Ruby's File.

Combined with the power of generics, you can easily build a vector of structs, matching the data type in a file:. This is another easy method for reading a file line by line, using the lines iterator. This iterator operates on a BufReader created from a File object. So a BufReader structure needs to be created for this to be used.