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From "Xiao-Feng Li" <xiaofeng...@gmail.com>
Subject Re: Announcing Jikes RVM 3.0 + Apache Harmony!
Date Mon, 11 Aug 2008 09:01:11 GMT


On Thu, Aug 7, 2008 at 11:20 PM, Ian Rogers <rogers.email@gmail.com> wrote:
>  Announcing Jikes RVM 3.0 + Apache Harmony! We are pleased to announce the
> release of Jikes RVM 3.0, an open-source meta-circular JVM written in Java.
> A new feature of the release is initial support for Apache Harmony's class
> library.
> What is Jikes RVM? Jikes RVM is a research virtual machine capable of
> running the latest Java programs. Writing a JVM in Java has many advantages
> including access to libraries such as* java.util.concurrent*, the use of
> IDEs like Eclipse and the use of annotations to extend the language and
> virtual machine. Jikes RVM is now over 10 years old and has been used in
> more than 190 refereed research papers.
> Support for Apache Harmony Jikes RVM is built using Apache Ant, getting the
> build to compile and use Apache Harmony's class library is as simple as
> defining the *classlib.provider* property to be *Harmony*. For example, to
> download and build Jikes RVM with Apache Harmony:
>   1. download the Jikes RVM from
>   http://sourceforge.net/project/showfiles.php?group_id=128805
>   2. extract the files
>   3. build Jikes RVM using Apache Ant and specifying what kind of Jikes RVM
>   configuration you would like and what kind of host you have. The prototype
>   configuration is recommended at the moment. To test the performance of the
>   optimizing compiler use a production build but this may have problems - see
>   features of the build below. To build on x86_64 linux, for example, run:
>   *ant -Dconfig.name=prototype -Dhost.name=x86_64-linux
>   -Dclasslib.provider=Harmony*
>   4. following the build the executable will be placed in the
> *dist*directory, for example the previous build will put the RVM in
>   *dist/protoype_x86_64-linux*.
> The build process will take Apache Harmony's class library from SVN, build
> it and then build the Jikes RVM using it. Once built the Harmony libraries
> won't be rebuilt and a typical prototype build will complete in under 2
> minutes.
> We need you help!
> We hope you will try out Jikes RVM 3.0 with Apache Harmony. There are many
> known and unknown problems and potential improvements, please help us to
> find what these are, which of these are priorities and also please feel free
> to send us your patches! The Jikes RVM is licensed under the CPL (the
> predecessor of the EPL). Apache Harmony can also help us, for example, by
> providing a separately packaged version of the class library so that we
> don't need to take it from SVN.
> The following URLs explain more:
>   1. the Jikes RVM web site: http://jikesrvm.org/ (you can find in here how
>   to develop Jikes RVM using IDEs like Eclipse)
>   2. the Jikes RVM JIRA bug and feature tracking system:
>   http://jira.codehaus.org/browse/RVM (a category of which is bugs and
>   features relating to Apache Harmony class library support)
>   <http://goog_1218120927426/>
>  <http://goog_1218120927426/>Some features of the build The Jikes RVM
> provides an optimizing compiler, an adaptive optimization system and
> on-stack replacement. When being built on a bootstrap JVM it can use the
> optimizing compiler, a feature of which is to follow references of final
> fields. There is the possibility of confusion as the boot strap JVM's class
> library and Apache Harmony's class library may not match, there are various
> fixes to deal with this, but an alternative is to use the baseline compiler
> (as in the prototype build).
> The Jikes RVM version of the Harmony kernel classes are provided in the *
> libraryInterface* directory. Code in this directory may be licensed under
> different licenses than the CPL.
> Jikes RVM comes with the MMTk garbage collectors and the VM magic classes
> may already be familiar to Apache Harmony developers.
> Testing your build The Jikes RVM performs Continuous Autonomous Testing, the
> results of which are tracked here: http://jikesrvm.anu.edu.au/cattrack/
> The scripts that test Jikes RVM are part of the distribution. For example,
> to build and test Jikes RVM 3.0 with SPEC JVM 2008 run:
> ant -f test.xml -Dconfig.name=prototype -Dhost.name=x86_64-linux
> -Dclasslib.provider=Harmony -Dtest-run.name=SPECjvm2008
> This will automatically download and install the benchmark in the Jikes RVM
> distribution before building and testing Jikes RVM 3.0 with it.
> Acknowledgments
> In getting Jikes RVM and Apache Harmony working together we were lucky to
> receive support and help from Tim Ellison and Mark Hindess.
> Thanks Thank you for your interest in this milestone in Jikes RVM's
> development and we look forward to your help in finding bugs and improving
> Jikes RVM!


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