Speed up TryServer by using TryChooser

If you haven’t already started using TryChooser, please try (pun intended!) it next time you are pushing to TryServer. If you have any questions about the syntax, please use the handy command line generator here, or read the docs. If you have difficulty after doing either of those ping the RelEng buildduty person.


Earlier this summer, we redesigned TryServer so each push to TryServer would run every possible type of job available in mozilla-central. This was the easiest and fastest way to get developers using TryServer as quickly as possible, which helped reduce breakages on mozilla-central. People loved TryServer, usage rocketed and it quickly became the heaviest load on our infrastructure. However, this also meant that every push to TryServer ran a lot of builds/unittests/talos jobs – whether the developer wanted them or not. A lot of CPU time is being wasted on jobs that people did not actually want, which in turn caused delays for other jobs coming next in the queue.

A month ago, lsblakk setup TryChooser [https://bugzilla.mozilla.org/show_bug.cgi?id=473184]. This allows developers to ask for only the builds and tests that they actually want in their push-to-try commit comments. This avoids wasting CPU cycles on unwanted jobs – which speeds up TryServer wait times for everyone. Great! Some people quickly started using TryChooser, which was great in terms of freeing up CPU cycles. However, the uptake has leveled off. Last week, and also the week before, only approx 1/2 the people using TryServer used TryChooser to specify what jobs they wanted. The piechart shows who did/didnt use TryChooser in the period between Mon, 20 Sep 2010 00:00:00 -0700 (PDT) and Sun, 26 Sep 2010 00:00:00 -0700 (PDT)

Please, use TryChooser to help save CPU cycles, and make TryServer faster for everyone!

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