Date: Thu, 20 Oct 2016 18:47:28 +0500 From: "Eugene M. Zheganin" <emz@norma.perm.ru> To: freebsd-stable@FreeBSD.org Subject: zfs, a directory that used to hold lot of files and listing pause Message-ID: <4d9269af-ed64-bb73-eb7f-98a3f5ffd5a2@norma.perm.ru>
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Hi.
I have FreeBSD 10.2-STABLE r289293 (but I have observed this situation
on different releases) and a zfs. I also have one directory that used to
have a lot of (tens of thousands) files. I surely takes a lot of time to
get a listing of it. But now I have 2 files and a couple of dozens
directories in it (I sorted files into directories). Surprisingly,
there's still a lag between "ls" and an output:
===Cut===
# /usr/bin/time -h ls
.recycle 2016-01 2016-04 2016-07 2016-10
sort-files.sh
2014 2016-02 2016-05 2016-08 ktrace.out
sort-months.sh
2015 2016-03 2016-06 2016-09 old
sounds
5.75s real 0.00s user 0.02s sys
===Cut===
I've seen this situation before, on other servers, so it's not the first
time I encounter this. However, it's not 100% reproducible (I mean, if I
fill the directory with dozens of thousands of files, I will not
certainly get this lag after the deletion).
Has anyone seen this and does anyone know how to resolve this ? It's not
critical issue, but it makes thing uncomfortable here. One method I'm
aware of: you can move the contents of this directory to some other
place, then delete it and create again. But it's kind of a nasty workaround.
Thanks.
Eugene.
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