GNU bug report logs - #19832
Deleting unused links is too slow

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Andreas Enge <andreas <at> enge.fr>
To: bug-guix <at> gnu.org
Subject: Deleting unused links is too slow
Date: Tue, 10 Feb 2015 20:25:21 +0100

Hello,

I just compiled a test package and tried a
"guix gc -d /path/to/package/in/store"

After printing
 deleting `/gnu/store/642pwarg5hppzh1gwadd07w0g4w3rwpx-nss-certs-3.17.3'
 deleting `/gnu/store/trash'
 deleting unused links...
which is instantaneous, I need to wait for 5 minutes with the disk spinning.

I suppose this is a side-effect of deduplication?

Andreas

Message #8 received at 19832 <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: Andreas Enge <andreas <at> enge.fr>
Cc: 19832 <at> debbugs.gnu.org
Subject: Re: bug#19832: Deleting unused links is too slow
Date: Tue, 10 Feb 2015 23:24:51 +0100

Andreas Enge <andreas <at> enge.fr> skribis:

> I just compiled a test package and tried a
> "guix gc -d /path/to/package/in/store"
>
> After printing
>  deleting `/gnu/store/642pwarg5hppzh1gwadd07w0g4w3rwpx-nss-certs-3.17.3'
>  deleting `/gnu/store/trash'
>  deleting unused links...
> which is instantaneous, I need to wait for 5 minutes with the disk spinning.

Literally 5 minutes?  It would be more like 30s on my SSD.

> I suppose this is a side-effect of deduplication?

That, and the fact that you have a disk that actually spins.  ;-)

If you haven’t GC’d in a long time, it’s also likely to take longer.

Ludo’.

Message #11 received at 19832 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Enge <andreas <at> enge.fr>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 19832 <at> debbugs.gnu.org
Subject: Re: bug#19832: Deleting unused links is too slow
Date: Wed, 11 Feb 2015 01:07:28 +0100

On Tue, Feb 10, 2015 at 11:24:51PM +0100, Ludovic Courtès wrote:
> If you haven’t GC’d in a long time, it’s also likely to take longer.

Maybe that was the problem. I tried again later to gc one package, and it was
almost instantaneous. Which means that there might not be a problem after all.

Andreas

Message #16 received at 19832-done <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: Andreas Enge <andreas <at> enge.fr>
Cc: 19832-done <at> debbugs.gnu.org
Subject: Re: bug#19832: Deleting unused links is too slow
Date: Thu, 12 Feb 2015 18:26:54 +0100

Andreas Enge <andreas <at> enge.fr> skribis:

> On Tue, Feb 10, 2015 at 11:24:51PM +0100, Ludovic Courtès wrote:
>> If you haven’t GC’d in a long time, it’s also likely to take longer.
>
> Maybe that was the problem. I tried again later to gc one package, and it was
> almost instantaneous. Which means that there might not be a problem after all.

OK, closing it then.

Thanks,
Ludo’.

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