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Written by binaryphile on 2025-01-24 at 18:41

Say, is there anyone in my network who knows how #NixFlakes work? I'm struggling getting a nix flake with my nodejs development environment for linux and macos to run quickly on mac. It takes about 1.6 seconds to fire up nix develop on linux (already too long) but 6.4 seconds on mac.

[#]Nix #NixOS

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Written by Aaron Honeycutt | 🐧🚀🌕 on 2025-01-24 at 19:21

@binaryphile could you share the flake? Did you just do nix flake init or use another tool?

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Written by binaryphile on 2025-01-24 at 19:50

@ahoneybun Thanks for the interest. I let ChatGPT set it up and then harangued it into functioning. It does function, but as I mentioned, slowness is an issue. It could very well be a nix configuration issue on the Mac, I did the default lix install of nix. The primary issue is that all of the derivation evaluation takes time (nothing is having to build on my machine and they've all been downloaded).

It won't fit in a post so here's a gist:

https://gist.github.com/binaryphile/80e0cb371f47382c5f9c9bb93ef87077

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Written by Aaron Honeycutt | 🐧🚀🌕 on 2025-01-24 at 20:02

@binaryphile oof yea it's been running for a few mins on my end (Pop!_OS using Nix Official installer) though I haven't done much with Flakes when it comes to nix develop though (mostly nix-shell).

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Written by binaryphile on 2025-01-24 at 20:35

@ahoneybun Thanks so much for trying that. I assume it's taking a while on subsequent runs as well?

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Written by Aaron Honeycutt | 🐧🚀🌕 on 2025-01-24 at 20:36

@binaryphile I don't think it ever finished for me, it's just stop on a copying message for me. Did you just run nix develop in the directory with the flake.nix or something else?

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Written by Aaron Honeycutt | 🐧🚀🌕 on 2025-01-24 at 20:38

@binaryphile ah it did finish:

aaronh@pop-os:~$ nix develop

error (ignored): error: reached end of FramedSource

error:

   … while fetching the input 'path:/home/aaronh'

   error: file '/home/aaronh/.config/copyq/.copyq_s' has an unsupported type

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Written by Aaron Honeycutt | 🐧🚀🌕 on 2025-01-24 at 20:40

@binaryphile ah if I run it in a nodejs project it is a bit different:

aaronh@pop-os:~/Projects/system76/docs$ nix develop

error: path '/nix/store/rigk4dc51c49yrpxqkz817hnj4g5vadd-source/flake.nix' does not exist

aaronh@pop-os:~/Projects/system76/docs$ ls

archived assets components content flake.nix icons layouts modules node_modules nuxt.config.js package.json package-lock.json pages plugins README.md shell.nix static tailwind.config.js TESTING.md

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Written by Aaron Honeycutt | 🐧🚀🌕 on 2025-01-24 at 20:40

@binaryphile ah right I need to add it to git... duh.

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Written by Aaron Honeycutt | 🐧🚀🌕 on 2025-01-24 at 20:42

@binaryphile it is faster after running it the first time.

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Written by binaryphile on 2025-01-24 at 21:20

@ahoneybun Is it closer to 2 seconds or 6 to get to a shell prompt after nix develop?

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Written by Aaron Honeycutt | 🐧🚀🌕 on 2025-01-24 at 21:23

@binaryphile looks like 5-6 seconds?

real 0m5.160s

user 0m1.396s

sys 0m0.626s

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Written by Aaron Honeycutt | 🐧🚀🌕 on 2025-01-24 at 21:23

@binaryphile I may base a PR to the system76/docs repo with this as it currently just has a shell.nix file.

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Written by binaryphile on 2025-01-24 at 21:36

@ahoneybun Ok, then perhaps it's not just me then. That's a great sanity check. I'll delve deeper on the differences between my linux and mac nix environments and see if I can unearth anything that would soup up the mac side. One difference is that the linux install is a single-user sans daemon, while the mac is multiuser with daemon. ChatGPT has also been hinting at performance issues related to how nix sets up a volume for the nix store on mac.

I'll follow up if I find anything.

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Written by Aaron Honeycutt | 🐧🚀🌕 on 2025-01-24 at 21:36

@binaryphile sounds good and glad to be the sanity check haha.

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Written by Brian May 🐧 on 2025-01-24 at 20:48

@binaryphile nix is not a fast language. It can be frustrating slow at times. See projects like TVIX https://tvl.fyi/blog/rewriting-nix that claims to get to address this problem (still early stages afaik).

You can use direnv to cache the environment so it doesn't have to be evaluated every time. See https://www.danielcorin.com/til/nix/nix-and-direnv-with-flakes/ for example.

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Written by binaryphile on 2025-01-24 at 21:38

@penguin_brian Thanks for the link, that was an interesting read. Good to see a similar flake to the one I was using, that means I'm probably not too far off the beaten path.

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