# Nerd Sniping: How can I improve the read in of a human-readable file?

**URL:** https://discourse.julialang.org/t/nerd-sniping-how-can-i-improve-the-read-in-of-a-human-readable-file/134517
**Category:** New to Julia
**Tags:** speed-optimization
**Created:** [December 12, 2025, 2:37pm UTC](https://discourse.julialang.org/t/nerd-sniping-how-can-i-improve-the-read-in-of-a-human-readable-file/134517 "2025-12-12T14:37:32Z")
**Posts on this page:** 1
**Showing post:** 16

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### Author: ![jakobnissen](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jakobnissen/32/13477_2.png) [@jakobnissen](https://discourse.julialang.org/u/jakobnissen)
#### Post date: [December 14, 2025, 12:48pm UTC](https://discourse.julialang.org/t/nerd-sniping-how-can-i-improve-the-read-in-of-a-human-readable-file/134517/16 "2025-12-14T12:48:01Z")

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Fun solution. To show off my packages MemoryViews.jl and BufferIO.jl, I wrote a solution using them. On my computer, it’s 8 times faster than your code and parses the 83 MB example file in 160 miliseconds.

You can find the code here: [play/ParseChallenge at master · jakobnissen/play · GitHub](https://github.com/jakobnissen/play/tree/master/ParseChallenge)

Some notes and limitations with the current code

- This solution uses what is currently BufferIO internals of how `line_views` work. However, I’ve wanted to document the specific behaviour for some time, so I’ll make a release that guarantees this behaviour.
- Error handling is not great. Production code would have better error messages and a dedicated exception type.
- The parsing is fairly strict. It requires
  - It requires you to know the number of blocks, and number of lines of integers per block
  - An integer must be exactly the regex `[0-9]{1-2}`, and be \< 41
  - An integer line must be 0-10 integers, separated by one space, with one optional trailing space, nothing less, nothing more

It could still be improved a little, by SIMD’ing the integer parsing.

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