Re: [PATCH] libuuid: Move clock.txt to /run

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On Wed, Mar 01, 2023 at 03:09:57PM +0100, Michal Suchanek wrote:
> Some users complain that due to filesystem performance of writing the
> clock.txt generating UUIDs is slow.

XFS right? ;-)

> uuidd would solve this but some distributions do not run it by default.

For some performance critical use-cases you will see this issue with
uuidd too. The latest changes in the libuuid and uuidd solves this
problem by continuous-clock where uuidd uses dedicated clock sequence
range to avoid often state-file updates. 

Numbers from Michael (author of the patch)

 The classic setup delivered <430.000 uuid/sec on average.
 The cont-clock setup delivered >6.800.000 uuid/sec on average.

I hope we will have -rc1 with this change this week.

Note that generate large number of time-based UUIDs without uuidd does
not make sense.

    Karel

-- 
 Karel Zak  <kzak@xxxxxxxxxx>
 http://karelzak.blogspot.com




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