speeding up zfs snapshot listing

[mike tancsa]

On 11/14/2019 9:40 AM, Matt Garber wrote:
> Try this instead, should be significantly faster at just displaying
> snapshots without the sizing info (if that works for your use case):
>
> # zfs list -t snapshot -o name -s name
>
>
Thanks, we actually already pair it down so that we can parse it easily.
But it does not seem to make much of a difference

% time /sbin/zfs list -Hp -oname,creation -S creation -t snapshot >
/dev/null
1.551u 15.869s 0:17.45 99.7%    66+177k 2050987+0io 0pf+0w

vs

% time /sbin/zfs list  -t snapshot >
/dev/null                              
1.434u 16.070s 0:17.62 99.3%    65+177k 2050896+0io 0pf+0w

and even just the name

% time /sbin/zfs list -Hp -oname -t snapshot >
/dev/null                    
1.180u 16.113s 0:17.51 98.7%    66+177k 2050906+0io 0pf+0w


    ---Mike