mirrors/git-annex
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages 1 Wiki Activity Actions

followup

Browse source
This commit is contained in:
Joey Hess 2016-05-31 12:17:50 -04:00
parent 2a7df4f6d9
commit 3426bae807
Failed to extract signature
1 changed files with 22 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

22
doc/todo/make_copy_--fast__faster/comment_3_5cd9e6b5d6d015120b5852bd212314aa._comment Normal file
View file

@ -0,0 +1,22 @@
[[!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
"""]]