57efd2721b
The looping over multiple changed hashes causes many calls to get_taskhash and get_unihash which are potentially slow and then overwritten. Instead, batch up all the tasks which have changed unihashes and then do one big loop over the changed tasks rather than each in turn. This makes worlds of difference to the performance graphs and should speed up build where many tasks are being rehashed. (Bitbake rev: c9ab598f6f1ea3ae3a0713dc6692b4c4bafbfb50) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org> (cherry picked from commit c9c68d898985cf0bec6fc95f54c151cc50255cac) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Bitbake
BitBake is a generic task execution engine that allows shell and Python tasks to be run efficiently and in parallel while working within complex inter-task dependency constraints. One of BitBake's main users, OpenEmbedded, takes this core and builds embedded Linux software stacks using a task-oriented approach.
For information about Bitbake, see the OpenEmbedded website: http://www.openembedded.org/
Bitbake plain documentation can be found under the doc directory or its integrated html version at the Yocto Project website: http://yoctoproject.org/documentation
Contributing
Please refer to http://www.openembedded.org/wiki/How_to_submit_a_patch_to_OpenEmbedded for guidelines on how to submit patches, just note that the latter documentation is intended for OpenEmbedded (and its core) not bitbake patches (bitbake-devel@lists.openembedded.org) but in general main guidelines apply. Once the commit(s) have been created, the way to send the patch is through git-send-email. For example, to send the last commit (HEAD) on current branch, type:
git send-email -M -1 --to bitbake-devel@lists.openembedded.org
Mailing list:
http://lists.openembedded.org/mailman/listinfo/bitbake-devel
Source code:
http://git.openembedded.org/bitbake/