A 2015 goal for the Ateam is to provide more and smarter ways to split tests up. There has already been a lot of effort in this area, but it was never formulated as a high level goal. Things that are actively being worked on or on the radar: * using test runtimes to normalize chunks * move chunking logic out of test harnesses and into manifestparser * chunking by arbitrary labels (i.e ability to hand pick tests into specific chunks) * run-by-dir everywhere (ensure chunks never split a directory of tests down the middle.. this is already implemented for some harnesses) In 2015 Q1 the focus will be on the first two bullet points for mochitest only. This is a tracking bug to collect all related dependencies.