Re: Are 'guix gc' stats exaggerated?

[Efraim Flashner <efraim@flashner.co.il>]

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On Thu, Jun 06, 2024 at 12:32:52PM -0700, Felix Lechner wrote:
> Hi Ludo'
> 
> On Thu, Jun 06 2024, Ludovic Courtès wrote:
> 
> > Where does that 3:1 figure come from?
> 
> Efraim's experience, I believe.

I've found that to be my experience, and posted two compsize outputs to
show where I got my numbers from.

> > Where do you see that in the code?  After checking
> > ‘removeUnusedLinks’, I think it counts space savings right.
> 
> Sorry, I didn't look at the code.  I was merely prompted to speculate by
> the mentioning of hard links and inferred wrongly, it seems, that the
> discrepancy was related---although in fairness I also doubted that a
> fixed 3:1 ratio could be credibly explained by deduplication alone.
> 
> Also, I don't mean to appear critical.  Thanks to everyone for your hard
> work on Guix!

In my not having looked at the code, I'll point out that running `guix
gc -C 10G` will clear 10G of items from the store, but will return
between 2-10G of real space for future use on the hard drive.  Thinking
across my various machines, on my desktop and laptop using btrfs this is
the case, but on my other machines using ext4 I think the space cleared
and what I'm expecting to have free to use do actually match up, but I
don't remember paying that much attention to the numbers previously on
those machines.

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Efraim Flashner   <efraim@flashner.co.il>   רנשלפ םירפא
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