Created Started Cancelled
By: Tom Sydney Kerckhove <syd@cs-syd.eu>
Number the mutation progress lines by how many have started The number in a progress line was the mutation's position in the manifest, and the manifest's order is no longer the order the mutations are tested in: groups run concurrently, and the most expensive of them are started first, so the numbers arrived in the log out of order and in jumps of hundreds. Telling a reader how far along a run is is the only thing the counter is there for, and a counter like that tells them nothing. The number is now how many mutations have started, this one included, so it climbs by one per line. It is taken and written under the same lock, so the lines reach the log in the order the numbers were handed out, and a debug run's per-mutation diffs arrive whole rather than interleaved. What this gives up is that the number is no longer an identifier for the mutation it belongs to: nothing needs it to be, because every line names the operator and the location, and the report names each mutation it has anything to say about by id.