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One of my reasons for using haskell was that it provides the possibility of
some parallell processing. Although since git-annex hits the filesystem
heavily and mostly runs other git commands, maybe not a whole lot.
Anyway, each git-annex command is broken down into a series of independant
actions, which has some potential for parallelism.
Each action has 3 distinct phases, basically "check", "perform", and
"cleanup". The perform actions are probably parellizable; the cleanup may be
(but not if it has to run git commands to stage state; it can queue
commands though); the check should be easily parallelizable, although they
may access the disk or run minor git query commands, so would probably not
want to run too many of them at once.
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