[BUG] hc-scaffold-deps Nix package seems extremely slow to build?

[pospi]

[BUG] hc-scaffold-deps Nix package seems extremely slow to build?

[pospi]

There is not much I can tell you, I think a subsequent run has built up more caches for me but my builds are still spending ~33min total in the Nix configuration phase https://github.com/h-REA/hREA/actions/runs/5932845698/job/16099193323 and you don't get any timestamps in the terminal output.

In any case, that last run did manage to complete and those test failures look genuine rather than execution timeouts so I'm thinking this can have priority lowered for now (I don't think anyone else is building 8 DNAs and a UI in a single repository). Will let you know if I turn out to be wrong about that.

[ThetaSinner]

@pospi I believe the scaffold deps is slow to build but you should be getting it pre-built from a cache and 1h 40m is not expected. We suspect there are some problems with cache eviction and is on my backlog to look at, I'm happy to move that up and look at it. We are also investigating a report of tryorama tests running slowly against Holochain 0.2.1 but this sounds different.

Could I have a link to a problem build so I can take a look?

[ThetaSinner]

An upstream cache would help speed this up I think. It looks like cachix is currently set up to cache but when you take updates from upstream it will be slow. The cachix-action has this option which lets you add more read locations.

I think you could point that at holochain-ci which should help but unless you're doing nix flake update regularly it will get out of sync fairly quickly. I'm looking at splitting out a 'release' cache that will contain just the versions of Holochain that people are using rather than every version our CI produces but I don't know when that's going to be ready yet.

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[ThetaSinner]

@pospi We've recently improved our cache size and maintenance so it should be smaller and contain what you need more often.

Could you try adding holochain-ci as an upstream cache for your builds? I'm also happy to come and make that change to see if it helps.

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