You should try adding {:cache-analysis true} to your :ci target. Caching is
otherwise only enabled for :none. Maybe that helps.
I have not looked at react-native much yet, not sure what special treatment JS
files need to run in there. shadow-build probably won't help you much in this
instance.
/thomas
On Saturday, February 11, 2017 at 4:24:01 PM UTC+1, Ben Brinckerhoff wrote:
> Thanks very much for the ideas!
>
> We are currently using {:optimizations :simple} for this build. All of the
> times I quoted above excluded the optimization time, however (I could see the
> compile time due to :verbose + :compiler-stats). We're in the process of
> switching to {:optimizations :whitespace} (we were looking at :none, but we
> need to generate a single file, since this is for a React Native project).
>
> > It would help if you could share your build config.
>
> Good point! Here is the cljsbuild build
>
> :ci {:source-paths ["src" "src-ios" "test" "test-ios"]
> :warning-handlers [foo.cljsbuild-util/fail-on-warning]
> :compiler {:output-to "ios/foo/main.jsbundle"
> :parallel-build false
> :output-dir "target/ci/"
> :optimizations :simple ; <- we're in the process of changing this to
> "whitespace"
> ;; Rules for pulling in RN bundle
> :closure-extra-annotations ["generated" "internal"]
> :closure-defines {"foo.app.config.foo_host" ""
> "foo.app.config.test_QMARK_" true}
> :language-in :ecmascript5
> :foreign-libs [{:file "../build/react-native-dev.js"
> :provides ["react-native"]}
> {:file "../build/react-requires-dev.js"
> :provides ["react-requires"]}]
> :externs ["externs.js"]
> :verbose true
> :compiler-stats true}}
>
> and our lein profile is
>
> :ci {:env {:test-multiplier "0.5"} ; environ variable
> :jvm-opts ^:replace ["-Xms1024m" "-Xmx1024m" "-server" "-Xss2m"]
>
> I was unaware of shadow-build - thanks for the idea! I'll take a look.
>
> Ben
>
> On Saturday, February 11, 2017 at 1:26:36 AM UTC-7, Thomas Heller wrote:
> > Are you by any chance using anything other than {:optimizations :none} in
> > your dev build config? 12s seems a bit excessive if you are just doing CLJS
> > recompiles.
> >
> > Ensure that your dev build does not use any production build settings. Your
> > CI server should probably run in production mode though as 12s shouldn't
> > hurt that much there. Typically when it comes to building larger projects
> > you want to rely on :none with caching for development. It would help if
> > you could share your build config.
> >
> >
> > If you are feeling adventurous you could try shadow-build if only to get a
> > more detailed report on where the time is spent. It should be a bit faster
> > overall as well but not by much. Happy to walk you through an example if
> > you want to test it.
> >
> > /thomas
> >
> > On Friday, February 10, 2017 at 6:15:34 PM UTC+1, Ben Brinckerhoff wrote:
> > > First of all, thanks to everyone for their hard work on Clojurescript and
> > > related tooling. It’s an incredibly productive and reliable stack to use.
> > >
> > > I’m investigating ways to speed up compile times for a closed-source
> > > project. We have about 8000 Clojurescript LOC and 200 Clojure LOC (in src
> > > and test combined). Some very rough indicators: a fresh compile of our
> > > test build takes about 60s. A small change to a file with maybe 15
> > > reverse dependencies takes about 12s using `cljsbuild auto`. We are using
> > > lein-cljsbuild 1.1.4 and clojurescript “1.9.293”.
> > >
> > > These times are pretty good, but of course speeding up compiles shrinks
> > > our feedback loop, both locally and on CI, where we do a number of fresh
> > > compiles for different builds. As a result, we want to see if there are
> > > things we can do to our code to speed up compiles.
> > >
> > > We have turned on the `verbose` and `compiler-stats` flags so we can see
> > > more information about compile times. We hope to upgrade to 1.9.456 soon
> > > so we can see per-file compile stats. We also need to investigate
> > > parallel builds again - we had previously run into bugs here, but I
> > > didn’t take the time to investigate more fully.
> > >
> > > Besides total LOC, are there other aspects of code bases that are known
> > > to slow down compiles? Perhaps macro expansion (we have a lot of
> > > core.async `go` blocks in some namespaces)? Perhaps the complexity of the
> > > dependency graph between namespaces? Something else? Has anyone else had
> > > experience altering a CLJS code base to improve compile times? Or
> > > tweaking compiler flags? `optimization` makes a big difference of course,
> > > but for my current investigation, I'm ignoring optimization time.
> > >
> > > Also, I noticed that Clojurescript performance is an idea for the Google
> > > Summer of Code
> > > https://github.com/clojars/clojure-gsoc-2017/blob/master/project-ideas.md#clojurescript-performance
> > >
> > > “There are many impactful enhancements we would like to make to
> > > ClojureScript with respect to both runtime and compile time performance …
> > > For compile time enhancements we should examine where parallelization,
> > > AST data representation changes, or more aggressive caching of
> > > intermediate artifacts may deliver faster development and production
> > > build time.”
> > >
> > > I did a quick search of Clojurescript for perf issues on JIRA, but didn’t
> > > see anything related to these (apologies if I just missed something
> > > obvious!). Is there a list somewhere of open issues that might improve
> > > perf in the compiler? Or are those ideas mostly in the “needs
> > > investigation” stage?
> > >
> > > Thanks very much!
> > > Ben
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