Are you on 32 or 64 bit Java? Startup is much faster on my machine
(2008 Macbook, Core2Duo) when I use a 32bit vm.
On Fri, May 11, 2012 at 11:33 PM, Stuart Sierra
<the.stuart.sie...@gmail.com> wrote:
> I have a large-ish Clojure project that involves a lot of network servers
> and background threads. It's difficult to work on a program like this by
> reloading code at the REPL, because old background threads may still be
> running with old code. So I end up restarting the process many times per
> day.
>
> I'm using Leiningen 2.0.0-preview3 and Apple's JDK 1.6.0_29 on Mac OS X
> 10.6.8.
>
> My Leiningen project is configured to load my app in the REPL:
>
> :repl-options {:init-ns my-project.main}
>
> From a clean start, `lein repl` takes 25 seconds to get to the first prompt.
> That's a long time during development.
>
> I tried pre-compiling everything by adding AOT-compilation:
>
> :aot [my-project.main]
>
> This is reasonable, because I'm usually only working on one source file,
> trying to fix a bug, and the Clojure loader will prefer .clj files that are
> more recent than their corresponding .class files.
>
> After `lein compile`, I'm down to 14 seconds to start a REPL. Better, but
> still not fast enough.
>
> What if I omit Leiningen altogether? First, generate the classpath:
>
> lein classpath > target/classpath
>
> Then call Java directly:
>
> java -cp `cat target/classpath` clojure.main -i src/my_project/main.clj
> -r
>
> This cuts startup time down to 6 seconds, but I lose all the niceties of the
> Leiningen REPL.
>
> Running Java with '-XX:+TieredCompilation' took off another half second.
> Adding '-client' had no visible effect.
>
> What other tricks do you have for speeding up your development cycle with
> Clojure?
>
> -S
>
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Moritz Ulrich
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