zfs list -t snapshot slow
Martin Matuska
mm at FreeBSD.org
Thu Jun 14 10:45:21 UTC 2012
Hi Alexandr,
this slowdown is known, as for fetching each snapshot its metadata are
to be fetched.
There was a speedup to this operation, but it affects only name-sorted
output,
you need to issue "-o name -s name" to your zfs list command.
More information:
http://svnweb.freebsd.org/base?view=revision&revision=230438
This change has been integrated into the tree on:
HEAD: r230438 (2012-01-21)
9-STABLE: r231946 (2012-02-20)
8-STABLE: r233862 (2012-04-04)
On 14. 6. 2012 12:24, Alexandr Kovalenko wrote:
> Hello!
>
> I've noticed it takes pretty unreasonable amount of time to list snapshots:
>
> # time (zfs list -t snapshot 2>&1 > /dev/null)
>
> real 0m4.919s
> user 0m0.146s
> sys 0m0.716s
>
> # zfs list -t snapshot | wc -l
> 1838
>
> kdump -f ktrace.out attached.
>
> Could anyone please advise what could cause this problem?
--
Martin Matuska
FreeBSD committer
http://blog.vx.sk
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