worldofpeace changed the topic of #nixos-dev to: NixOS Development (#nixos for questions) | NixOS 20.09 Nightingale ✨ https://discourse.nixos.org/t/nixos-20-09-release/9668 | https://hydra.nixos.org/jobset/nixos/trunk-combined https://channels.nix.gsc.io/graph.html | https://r13y.com | 20.09 RMs: worldofpeace, jonringer | https://logs.nix.samueldr.com/nixos-dev
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<gchristensen> anyone want to debug a zfs / zed + udev problem with me? :)
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<red[evilred]> So, at the riscv summit a company said that they had a 1000+ core IC ready to roll
<red[evilred]> add a decent amount of memory and I'd like to see how that would operate as a hydra box
<samueldr> eek
<samueldr> I'm not the best one to know, but I would think it's not going to do great
<samueldr> even with fast storage
<samueldr> because it's just waaaaay many
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<red[evilred]> I have a thing for multiple cores
<red[evilred]> I've yet to meet a machine with more cores than I've been able to saturate
<samueldr> the issue here is about disparate tasks
<samueldr> unless you leave all 1000+ cores to only one build
<samueldr> if you split it, let's say, 50 ways, 50 different builds, doing disk access on different things is going to be a drag
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<cransom> i'm sure you can find some ibm mainframe people who would still scoff at the hydra load.
<hexa-> samueldr: latest eypc has 124 PCIe 4.0 lanes exposed, so you could certainly partition 20 NVME disks with it
<domenkozar[m]> yeah but at that point you need a really smart scheduler
<hexa-> one step at a time :p
<domenkozar[m]> probably you could run some kind of hypervisor and then Nix inside it
<gchristensen> imo we should find a way to use Amazon Batch / Apache Airflow / etc. as a schehduler
<gchristensen> and upload all the jobs, have some other thing do all the building and nar'ing
<gchristensen> and a machine or a collection of machines can do the signing -- without a central hub /spoke
<domenkozar[m]> eh if you ever want to support IFD
<domenkozar[m]> it's all extremely coupled
<gchristensen> ah
<domenkozar[m]> you have to do a lot of closure traversals
<gchristensen> I dunno it might be a teensy bit slower for small thinsg but I think substantially faster for big things
<domenkozar[m]> sadly the algorithm in Nix is not "just traverse the tree"
<domenkozar[m]> and probably with CA derivations it will get worse
<domenkozar[m]> and then you have to handle failures
<domenkozar[m]> you don't want to rebuild them again and again
<gchristensen> true
<domenkozar[m]> etc
<gchristensen> womp womp
<domenkozar[m]> it's all easy on the surface :D
<gchristensen> something something contact with the enemy
<domenkozar[m]> heh
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<domenkozar[m]> I never remember makeWrapper attribute, always try to reverse name it from wrapProgram
<gchristensen> same
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<domenkozar[m]> which goes like:
<domenkozar[m]> git grep wrapProgram
<domenkozar[m]> pick one file
<domenkozar[m]> look at buildInputs
* domenkozar[m] needs to use manuals more often
<gchristensen> that is what I do too
<gchristensen> samueldr: your fancy stage-1 has made me wish after a fast stage-1 for the rest of us
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<aminechikhaoui> anyone knows offhand if hydra would support git lfs inputs
<gchristensen> I think it would if you installed the lfs plugin for its git
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<cransom> not bad.
<cransom> it's still a pile of hard drives you could go lift without a likely hernia at least.
<eyJhb> I always enjoy seeing the cache gchristensen , such nice things in there
<cransom> happen to have a timestamp of the oldest nar in there?
<gchristensen> 2013 probably, when the bucket was created
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<red[evilred]> hmm, I almost have enough storage at the house to mirror that cache
<gchristensen> I think it'd be nice to have an archive somewhere
<red[evilred]> I think my ISP would have a hissyfit if I started syncing :-)
<red[evilred]> is that hydra's buildcache?
<gchristensen> yea
<gchristensen> cache.nixos.org
<gchristensen> I've got this draft PR for initial eyes if anyone is interested - https://github.com/NixOS/nixpkgs/pull/106574
<{^_^}> #106574 (by grahamc, 9 minutes ago, open): nixos/amazonImageZfs: init
<gchristensen> typical things like smaller commits and useful commit messages, of course, to be done
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