Very slow Clojurescript build

[Harri Ohra-aho]

Hi,

Our project's build has recently got extremely slow if started from a clean state. The build time currently is close to two hours.

The build always seems to hang here:
Analyzing jar:file:/Users/ohra/.m2/repository/reagent/reagent/0.5.0/reagent0.5.0.jar!/reagent/debug.cljs
Compiling resources/public/trex/js/out/reagent/debug.cljs

If I take a thread dump at this point these lines always appear:
...
at cljs.util$topo_sort.invoke(util.clj:146)
at cljs.analyzer$ns_dependents.invoke(analyzer.clj:563)

If the build is killed at this point and started again it completes normally in a minute or so. I tried leaving out cljsbuild but the build also hangs then.

It's probably worth noting that reagent/debug.cljs is a totally empty namespace. Is there something strange happening with the dependency analysis or what might be the problem?

Harri

[David Nolen]

Seems like you have enough information to try and put together a minimal reproducible case. That would be helpful.

David

Harri


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[Juan Patten]

Hi Harri - did you ever get this figured out? I'm seeing a similar issue.

-- J.R.

[David Nolen]

There's a known bug with topological sorting. Use :recompile-dependents false in your compiler config to disable the source of the issue. There's already a patch that fixes this issue it just needs more testing.

David

[Juan Patten]

Hey David - that worked. Thanks very much!

Thanks also for all you do for the CLJS world :)

-- J.R.

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