Bug 1289249 just landed on the autoland repository. It refactors most (but not all) build related TaskCluster tasks to use `run-task` and `hg robustcheckout` for managing the version control checkout.
This means: * All lines in task output will now be prefixed with timestamps, making it easier to see where time is going * Mercurial cloning and checkout is now using the best practices that `hg robustcheckout` employs The user-impacting win here is the VCS interaction improvements yield quicker task execution. Before, tc-vcs was downloading a tarball snapshot of the repository on every task. This incurred ~2 GB of network traffic and I/O and this typically took well over a minute. With `hg robustcheckout`, hg storage is intelligently "pooled" and cached on the workers. This means subsequent tasks on the workers have to perform significantly less work to obtain a checkout than with the tc-vcs model. This translates to subsequent tasks running 1+ minutes faster. For example, [1] is an artifact build task completing in 230s. What's more, now that we're using vanilla Mercurial for source control management, we'll be able to leverage upstream improvements to clone and checkout more easily. This includes employing shallow and narrow clone and sparse checkout. Lots of potential room for even more drastic efficiency wins... [1] https://public-artifacts.taskcluster.net/CSIOY8V2QH6Ywr0WdckTiA/0/public/logs/live_backing.log
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