GNU bug report logs - #24937
"deleting unused links" GC phase is too slow

Previous Next

Full log

View this message in rfc822 format

From: Ludovic Courtès <ludo <at> gnu.org>
To: Ricardo Wurmus <rekado <at> elephly.net>
Cc: 24937 <at> debbugs.gnu.org
Subject: bug#24937: "deleting unused links" GC phase is too slow
Date: Fri, 17 Apr 2020 10:16:09 +0200

Hi Ricardo,

Thanks for running this benchmark!

Ricardo Wurmus <rekado <at> elephly.net> skribis:

>   root <at> hydra-guix-127 ~# ls -1 /gnu/store/.links | wc -l
>   2017395

That’s not a lot, my laptop has 2.8M links.

It’s interesting to see that system time remains at ~4.2s in all modes.
So the only thing that modes 2 and 3 achieve is increasing CPU time.
It’s as if the order in which files are stat’d had no impact on I/O
performance.

Ludo’.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.