After watching our build on some of the older laptops in use at the Open Source Jumpstart, I decided that the inefficiencies of our build were overdue some attention. I created a new branch:
https://svn.apache.org/repos/asf/harmony/enhanced/java/branches/mrh and set about reducing resource usage and generally improving our builds. Currently my changes improve the federated build time (after fresh checkout) by 8% and the build time (after a build[0]) by 40%. Also, as the build does fewer copies, the size of the resulting build tree is down from about 1.5G to less than 1G. The improvements to the classlib build times are 9% and 57% respectively. I am planning to merge my changes back to the trunk so I thought I should document some of the differences. The main functional change is that I have removed the 'build-java', 'build-native' and 'build-test' targets in the classlib build. I've replaced them with properties (defaulting to true) called 'build.java', 'build.native', and 'build.test'. So that: ant build-java becomes: ant -Dbuild.native=false -Dbuild.test=false This may seem worse (in terms of typing) but it works from the federated build, in jdktools, and in individual modules rather than just in classlib. I've not yet made the necessary changes to drlvm. I've appended a summary of other changes. Regards, Mark. [0] This is the pathological case - no changes - similar to the typical development case where a developer will have changed one or two files. federated build: Rename "internal" targets to begin with '-' so they can't be called directly. This should mean we are left with a smaller set of API targets to support namely: fetch-depends check-depends build clean findbugs test This is incomplete with significant work still to do particularly in drlvm. Reduce copying in federated build by building directly to target/hdk where possible. Again this is incomplete. Pass svn.info property down to builds to avoid repeated "svn info" calls that make a big difference to build times. It is a problem if people modify versions of modules independently of the top-level but I think that this has been broken for a while anyway. Add "check-depends" target to federated build. Fix MANIFEST.MF files to use specification version from a property rather than being hardcoded to 1.5. classlib: Remove make/build-*.xml "ant test" is just a wrapper for "ant -f deploy/build/test/build.xml" jdktools: As with classlib, add build.java, build.native, and build.test properties. Move tests to the HDK. drlvm: Change implementation version in drlvm jars manifests to be svn repository/revision.
