profiling: replace '+' markup of nested lines with indentation The display of nested lines for hg --profile was very non-obvious and made it look like sort didn't work. The '+' immediately before CallCount was not related to the CallCount and did not mean plus in any integer sense. The '+' before module looked like a part of the module name and not like ascii art. Instead we now indent the subordinate module names to clearly show the structure.

Merge crew and main.

merge: don't fiddle with name lookups or i18n in hot loops We perform attribute dereferences and i18n lookups before looping.

merge: apply non-interactive working dir updates in parallel This has a big effect on the performance of working dir updates. Here are the results of update from null to the given rev in several repos, on a Linux 3.2 system with 32 cores running ext4, with the progress extension enabled. repo rev plain parallel speedup hg 7068089c95a2 0.9 0.3 3 mozilla-central fe1600b22c77 42.8 7.7 5.5 linux-2.6 9ef4b770e069 31.4 4.9 6.4

worker: allow a function to be run in multiple worker processes If we estimate that it will be worth the cost, we run the function in multiple processes. Otherwise, we run it in-process. Children report progress to the parent through a pipe. Not yet implemented on Windows.

worker: partition a list (of tasks) into equal-sized chunks

worker: estimate whether it's worth running a task in parallel Not implemented for Windows yet.