That's really cool. I'm glad someone got it to work and with little modification!
On Jul 15, 4:21 pm, Joel Dice <joel.d...@gmail.com> wrote: > (sorry about the lack of subject in my original post; I've added one to > this email) > > On Fri, 15 Jul 2011, George Jahad wrote: > > very cool Joel! I'd also be interested in start up time of avian vs. > > hotspot, i.e. does avian make it viable to use clojure for short, > > quick scripts? > > Possibly. By default, Avian is noticeably slower to start up than > Hotspot, at least when using OpenJDK's class library. The boot process > for that library touches a lot of code in a lot of classes, and Hotspot > has several performance advantages to make quick work of it. On the other > hand, Avian can also be built to use its own class library, which allows > much faster startup. Unfortunately, it doesn't currently have all the > classes needed to support Clojure, and I haven't checked to see how much > would need to be added to make it work. > > Avian also supports ahead-of-time compilation from Java bytecode to native > machine code, so it would be possible to create an executable with all the > OpenJDK and Clojure classes precompiled, thereby bypassing the need for > JIT compilation at runtime except for dynamically-loaded classes. That > would be faster, but I'm not sure by how much. > > The ideal approach in terms of startup time would be to add whatever > classes needed to Avian's class library to support Clojure, use ProGuard > to shrink and optimize the combination of clojure.jar and the system class > library, and precompile the result into native code. I might take a stab > at that if I have time. > > > > > > > > > > > On Jul 15, 11:59�am, Joel Dice <joel.d...@gmail.com> wrote: > >> Hi all, > > >> I thought I'd share the results of a fun little excercise I did this > >> morning: running Clojure on a VM with native support for tail call > >> optimization and first class continuations. �Any Schemers on this list > >> will probably appreciate it. > > >> The VM in question is Avian (http://oss.readytalk.com/avian/), built with > >> optional tail call and continuation features enabled and using the OpenJDK > >> class library. �It's not nearly as fast or sophisticated as e.g. Hotspot, > >> but it has some features that make it interesting for running non-Java > >> languages. I'm using the latest commit from the Git repository. > > >> For example, here's what happens if you recurse too deeply using Hotspot: > > >> � $ java -cp clojure.jar clojure.main > >> Clojure 1.2.1 > >> user=> ((fn this [n] (if (= n 1000000) n (this (+ n 1)))) 0) > >> java.lang.StackOverflowError (NO_SOURCE_FILE:0) > >> user=> > > >> With Avian, there is no overflow, and we also get to play with > >> continuations: > > >> � $ ../avian/build/linux-x86_64-tails-continuations-openjdk-src/avian > >> -Xmx512m -cp clojure.jar clojure.main > >> Clojure 1.2.1 > >> user=> ((fn this [n] (if (= n 1000000) n (this (+ n 1)))) 0) > >> 1000000 > >> user=> (defn call-cc [function] > >> � � (avian.Continuations/callWithCurrentContinuation > >> � � � (reify avian.CallbackReceiver > >> � � � � (receive [_ continuation] > >> � � � � �(function (fn [result] (.handleResult continuation > >> result))))))) > >> #'user/call-cc > >> user=> (call-cc (fn [continuation] (continuation "hello, world!"))) > >> "hello, world!" > >> user=> > > >> For more information about how continuations work in Avian, please > >> seehttp://oss.readytalk.com/avian/javadoc/avian/Continuations.html. > > >> Anyway, I think this is an interesting experiment since it shows that > >> if/when tail call and continuation support are integrated into the JVM > >> officially (http://openjdk.java.net/projects/mlvm/), Clojure could benefit > >> with few or no modifications. > > > -- > > 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 -- 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
