Bryan O'Sullivan <bryano@fb.com> [Sat, 09 Feb 2013 15:51:32 -0800] rev 18639
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
Bryan O'Sullivan <bryano@fb.com> [Sat, 09 Feb 2013 15:51:32 -0800] rev 18638
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.
Bryan O'Sullivan <bryano@fb.com> [Sat, 09 Feb 2013 15:51:32 -0800] rev 18637
worker: partition a list (of tasks) into equal-sized chunks
Bryan O'Sullivan <bryano@fb.com> [Sat, 09 Feb 2013 15:51:26 -0800] rev 18636
worker: estimate whether it's worth running a task in parallel
Not implemented for Windows yet.