Very interesting tip! Also, like vimclojure, you can run nailgun ( http://martiansoftware.com/nailgun/background.html) locally or on your server via ssh.
On Mon, Nov 23, 2009 at 5:07 AM, Alex Osborne <a...@meshy.org> wrote: > We were discussing Clojure startup time (in the context of Leiningen) > and Phil Hagelberg asked some JRuby people about startup time. They > suggested using -Xbootclasspath. > > Check this out: > > % time (echo | java -client -cp clojure.jar clojure.main) > 0.84s user 0.04s system 96% cpu 0.908 total > > % time (echo | java -client -Xbootclasspath/a:clojure.jar clojure.main) > 0.42s user 0.04s system 106% cpu 0.431 total > > For the server VM: > > % time (echo | java -server -cp clojure.jar clojure.main) > 1.07s user 0.06s system 113% cpu 0.995 total > > % time (echo | java -server -Xbootclasspath/a:clojure.jar clojure.main) > 0.56s user 0.06s system 109% cpu 0.562 total > > For reference: > > % java -version > java version "1.6.0_16" > Java(TM) SE Runtime Environment (build 1.6.0_16-b01) > Java HotSpot(TM) Server VM (build 14.2-b01, mixed mode) > > Apparently on Dan Larkin's PC startup time went from a terrible 5.5s to > a more bearable 1.9s. > > Looks like it's problematic to put Clojure libs in the bootclasspath > though. I get an NPE: > > Caused by: java.lang.NullPointerException > at clojure.lang.RT.load(RT.java:377) > at clojure.lang.RT.load(RT.java:371) > > Which is this line from RT.java: > URL classURL = baseLoader().getResource(classfile); > > (clojure.lang.RT/baseLoader) isn't null, so I'm not sure what the deal > is with that unless the class loading runs in a different thread where > it is null or something. But if you just put the Clojure jar itself in > -Xbootclasspath and the rest of your libs as normal -cp you still get a > nice fast start. :-) > > Charles Nutter has a nice list of JVM flags here: > > http://blog.headius.com/2009/01/my-favorite-hotspot-jvm-flags.html > > I don't get much of a benefit out of -XShare on my system but it might > be worth trying as well. > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com<clojure%2bunsubscr...@googlegroups.com> > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
