When more than one build request is available for a builder, Buildbot can "merge" the requests into a single build. This is desirable when build requests arrive more quickly than the available slaves can satisfy them, but has the drawback that separate results for each build are not available. http://docs.buildbot.net/0.8.8/manual/cfg-builders.html#merging-build-requests The default (what is happening now) is to merge build requests. This sometimes makes difficult the gardening process, because from one build to the another, several revisions are merged on the build and telling which revision broke some test is not straightforward. However this helps to have shorter waiting queues. So, maybe the best compromise between the two options is to only disable merge requests for the bot "GTK Linux 64-bit Release (Tests)" and see how this works. Ideally issue https://bugs.webkit.org/show_bug.cgi?id=131948 should be fixed before.
I'd definitely like to get the opinion of the Apple buildbot people.
(In reply to comment #1) > I'd definitely like to get the opinion of the Apple buildbot people. This would only affect the GTK buildbot "GTK Linux 64-bit Release (Tests)" ... So, what kind of question do you want to ask them? Maybe if they have any experience with a similar setup?