is there a way to get boot to download dependencies in parallel?

@thedavidmeister I'm quite sure there isn't. If downloading deps is slow, check you are running 2.7.2 which has a fix related to this.

"slow" is relative

watching it download over and over on CI/deployment is slow simply because it happens so much

That's why CI services provide cache usually

cache is not a silver bullet for perf

neither is paralleziation, it wouldn't probably help if bottle neck is network

i'm currently doing work where caching the deps isn't appropriate because i'm tweaking them

other package management tools have demonstrated quite well that downloading deps in parallel is a significant boost

I'm not sure which version of Maven we use, but they added parallel loading to some files few years ago

it just isn't something that can be configured

oh ok, so it's something that would need to happen upstream of boot?

Yes

Boot uses Pomegranate which uses Maven-resolver (previously called Aether)

https://issues.apache.org/jira/browse/MRESOLVER-7

this seems to be what i want, POMs are taking ages for me

well that's very sad, that there was a PR up and now it has a ton of merge conflicts 😞

They don't use github

this must be wasting thousands of hours globally per year >.<

oh well, i hope it gets in someday

Wonder if clj does things in parallel…

(In general would be interesting to see boot as a library on top of a preconfigured classpath provided by clj but I guess that’s a bit further away :D)

Currently, clj (really tools.deps.alpha) does not do parallel download but it definitely could

There are two phases - expansion (needs poms) and download (jars). The first would be tricky to do in parallel but the latter would be easy

I wrote a little thing to control when the cljs task runs: https://gist.github.com/flyingmachine/dea69b7e62dabdfb26ae6419603eb4f7

It was also running when I would change a scss file, and the cljs compile would take ~3 seconds, which isn’t a great workflow

nonrecursive that's sweet

Cljs compile should not take 3 seconds if no Cljs files changed

using pom to create a pom.xml, i have

{pom :project 'myproject :version "1.0.0"}

@andrew.sharp57 see https://github.com/juxt/edge/blob/054ed4879ba113ca3e52a732cb648e24ddc66921/build.boot#L19-L29

That version is slightly more complicated than just git describe, but should give you a good base to work from