I use ubuntu with an SSD and I hardly notice the lein repl startup time.
Even in Eclipse the repl starts within a couple of seconds.
I am in the same situation, multiple processes, oracle, .... About 80
dependencies total.
I7 HT, 8 gig of ram
Before using an SSD, I used to copy the most used tools (jdk, tomcat, ...) to a
Ram drive at boot time (asynchronously obviously) and this cut the
start->crash->edit fix->restart by a significant factor.
Presently, I am on the verge of switching to ubuntu 64-bits. Just waiting for a
window to work on it.
Luc
> 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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