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NixOS RISC-V

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NixOS on RISC-V https://wiki.nixos.org/wiki/RISC-V https://pad.lassul.us/NixOS-riscv64-linux https://github.com/orgs/NixOS/teams/risc-v58 Servers

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21 Jun 2025
@ocfox:matrix.orgocfox joined the room.03:36:15
@lotte:chir.rsCharlotte 🦝 (it/its) https://github.com/NixOS/nixpkgs/commit/88c1caa7d016c401082a44979bfde7e5e276048f seems to maybe have broken riscv cross compilation? 10:59:14
@lotte:chir.rsCharlotte 🦝 (it/its) https://hydra.chir.rs/build/235667/nixlog/1/tail 10:59:21
@misuzu:matrix.orgmisuzu https://github.com/NixOS/nixpkgs/pull/418640 13:23:56
@lotte:chir.rsCharlotte 🦝 (it/its)ah, nice13:24:39
@lotte:chir.rsCharlotte 🦝 (it/its)so that nixpkgs tree is slapped on my now incredibly complex system update pr :D13:43:24
@genericnerdyusername:matrix.orgGenericNerdyUsername joined the room.18:59:54
@genericnerdyusername:matrix.orgGenericNerdyUsernameWhats the absolute bare minimum riscv config nixos would need to get something on screen?20:03:27
@alex:tunstall.xyzAlex
In reply to @genericnerdyusername:matrix.org
Whats the absolute bare minimum riscv config nixos would need to get something on screen?
Depends on your hardware.
20:37:16
@genericnerdyusername:matrix.orgGenericNerdyUsernamei think i phrased that badly20:37:39
@genericnerdyusername:matrix.orgGenericNerdyUsernamewhats the minimum hardware that nixos needs?20:37:49
@genericnerdyusername:matrix.orgGenericNerdyUsernamelike do you need the floating point extensions?20:37:59
@alex:tunstall.xyzAlex
In reply to @genericnerdyusername:matrix.org
whats the minimum hardware that nixos needs?
If you don't plan to evaluate Nixpkgs on the machine, anything that can run Linux will do.
It's pretty hard (but still possible) to trim the system below a few hundred MiBs of disk usage.
20:39:34
@genericnerdyusername:matrix.orgGenericNerdyUsernameand if you do want to evaluate nixpkgs?20:39:55
@alex:tunstall.xyzAlex Nixpkgs takes a fair bit of memory to evaluate.
I can't recall, but it's probably on the order of a few hundred MiB minimum.
I've seen some evals go beyond 1 GiB, though I think most cases aren't that large.
20:41:31
@alex:tunstall.xyzAlex
In reply to @genericnerdyusername:matrix.org
like do you need the floating point extensions?
Probably not needed.
20:44:16
@fgaz:matrix.orgfgaz
In reply to @alex:tunstall.xyz
Nixpkgs takes a fair bit of memory to evaluate.
I can't recall, but it's probably on the order of a few hundred MiB minimum.
I've seen some evals go beyond 1 GiB, though I think most cases aren't that large.
4 GB if you want to nix search 🫠
20:44:28
@alex:tunstall.xyzAlex^ Requires evaluating all of Nixpkgs lol20:44:43
@fgaz:matrix.orgfgaz
In reply to @alex:tunstall.xyz
^ Requires evaluating all of Nixpkgs lol
i'm still of the opinion that it doesn't need to and could do with a small fraction of that https://discourse.nixos.org/t/nix-search-a-faster-better-nix-search/48568/19
20:49:00
@alex:tunstall.xyzAlex It absolutely shouldn't need to (e.g. why not pre-evaluate it into a DB you can quickly search).
But it does.
20:49:50
@fgaz:matrix.orgfgazit does pre-eval on the first search you perform. but even that first search shouldn't require all that memory, see the post I linked above20:51:03
@fgaz:matrix.orgfgazor did you mean a downloadable db?20:51:39
@alex:tunstall.xyzAlex

It could be downloaded.
That's just an idea of one way of implementing it. There are probably others.

And yeah, I can imagine how it could be possible to trim a lot of the memory usage if you only evaluate the metadata you need and not the whole derivation graph.

21:05:24
@genericnerdyusername:matrix.orgGenericNerdyUsernamelike nix-index?21:15:22
22 Jun 2025
@ss:someonex.netSomeoneSerge (Ever OOMed by Element) changed their display name from SomeoneSerge (UTC+U[-12,12]) to SomeoneSerge (Ever OOMed by Element).12:15:03
@steeringwheelrules:tchncs.desteeringwheelrules joined the room.13:27:25
@rosscomputerguy:matrix.orgTristan RossAfter a month, my VisionFive2 has finished building a graphical version of my config. It has COSMIC now and ssh should work.15:01:19
@rosscomputerguy:matrix.orgTristan RossIt also went from 25.05 to 25.1115:05:27
@dramforever:matrix.orgdramforeverMONTH16:53:27
@rosscomputerguy:matrix.orgTristan Ross
In reply to @dramforever:matrix.org
MONTH
Yes, it really took that long. It finished some time last night since it only had 30 derivations to finish.
17:05:48

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