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[[!comment format=mdwn
username="yarikoptic"
avatar="http://cdn.libravatar.org/avatar/f11e9c84cb18d26a1748c33b48c924b4"
subject="comment 17"
date="2022-06-06T14:00:05Z"
content="""
FWIW4Joey:
> I have made a standalone tarball built that way available here: https://downloads.kitenet.net/git-annex/linux/debuglocks/
I have tried that version. Placing similar load I just got some `move`s to fail ([our issue+idea to just call multiple times](https://github.com/dandi/dandisets/issues/176)) and some other oddities (not new, yet to figure out) but overall -- I have not spotted similar MVar messages :-/ (filing a comment to \"jinx\" it, rerunning again -- seeing some `get`'s going ;))
4Atemu:
> I'm not aware of other means of measuring fragmentation
isn't https://github.com/kilobyte/compsize the one reporting number of fragments, thus degree of fragmentation? As I summarized in [comment above](http://git-annex.branchable.com/bugs/get_is_busy_doing_nothing/#comment-9c647c8d9837d46e45675de30ebfeefc) I have used it + `btrfs fi defrag`.
> It might be worth looking into the timings of git annex get's write operations using iostat --human 1.
well -- it confirms that there is \"write silence\" for a while followed by a burst, e.g.:
```
Device tps kB_read/s kB_wrtn/s kB_dscd/s kB_read kB_wrtn kB_dscd
dm-0 50.00 800.0k 0.0k 0.0k 800.0k 0.0k 0.0k
dm-0 9.00 144.0k 0.0k 0.0k 144.0k 0.0k 0.0k
dm-0 0.00 0.0k 0.0k 0.0k 0.0k 0.0k 0.0k
dm-0 0.00 0.0k 0.0k 0.0k 0.0k 0.0k 0.0k
dm-0 0.00 0.0k 0.0k 0.0k 0.0k 0.0k 0.0k
dm-0 0.00 0.0k 0.0k 0.0k 0.0k 0.0k 0.0k
dm-0 0.00 0.0k 0.0k 0.0k 0.0k 0.0k 0.0k
dm-0 17.00 0.0k 207.3M 0.0k 0.0k 207.3M 0.0k
dm-0 50.00 4.0M 319.9M 0.0k 4.0M 319.9M 0.0k
dm-0 111.00 12.6M 365.8M 0.0k 12.6M 365.8M 0.0k
dm-0 99.00 2.9M 685.5M 0.0k 2.9M 685.5M 0.0k
dm-0 107.00 1.6M 10.4M 0.0k 1.6M 10.4M 0.0k
dm-0 236.00 3.7M 0.0k 0.0k 3.7M 0.0k 0.0k
dm-0 330.00 5.2M 0.0k 0.0k 5.2M 0.0k 0.0k
dm-0 323.00 5.0M 0.0k 0.0k 5.0M 0.0k 0.0k
```
"""]]