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If we ever write workers that need to preserve grouping in input we should consider allowing callers to specify a partition strategy. olivia is not a fan of this partitioning strategy when files are involved. In his words: Single-threaded Mercurial makes a point of creating and visiting files in a fixed order (alphabetical). When creating files in order, a typical filesystem is likely to allocate them on nearby regions on disk. Thus, when revisiting in the same order, locality is maximized and various forms of OS and disk-level caching and read-ahead get a chance to work. This effect can be quite significant on spinning disks. I discovered it circa Mercurial v0.4 when revlogs were named by hashes of filenames. Tarring a repo and copying it to another disk effectively randomized the revlog ordering on disk by sorting the revlogs by hash and suddenly performance of my kernel checkout benchmark dropped by ~10x because the "working set" of sectors visited no longer fit in the drive's cache and the workload switched from streaming to random I/O. What we should really be doing is have workers read filenames from a ordered queue. This preserves locality and also keeps any worker from getting more than one file out of balance. N)r� )ZlstZnslices�ir r r r� � s r� )T)FT)'Z __future__r rU r rP r@ r r� r� Z BaseSelector� ImportErrorZ thirdpartyr Zi18nr � r r r r r r r Zispy3r# �objectr$ ZisposixZ iswindowsrE rD rH rO rJ r� r� rI r` r� r r r r �<module> sJ 0 � % c