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Joey Hess 2016-05-31 12:17:50 -04:00
parent 2a7df4f6d9
commit 3426bae807
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[[!comment format=mdwn
username="joey"
subject="""comment 3"""
date="2016-05-31T16:02:01Z"
content="""
copy --to has to query the git-annex branch to see if the file is on the remote.
So it has worse locality than copy --from, which can simply stat the local
file to see if it's present.
Whatever inneficiencies git-annex has here are well swamped by the overhead
of git querying the branch.
When the remote has most of the files already, `git annex copy --to remote` is
similar to `git annex find --not --in remote`.
Here I've ran that under /usr/bin/time, and it looks like git-annex
ran for 89 seconds out of the 260 second runtime. So at least 65% of the total
runtime is spent by git querying the branch.
89.26user 6.92system 4:20.80elapsed 36%CPU (0avgtext+0avgdata 75584maxresident)k
516432inputs+0outputs (0major+31156minor)pagefaults 0swaps
"""]]