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Re: Performance issues with /gnu/store in virtual machines
From: |
Ludovic Courtès |
Subject: |
Re: Performance issues with /gnu/store in virtual machines |
Date: |
Tue, 22 Aug 2017 12:11:43 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux) |
Hi Chris,
Christopher Baines <address@hidden> skribis:
> 1.13 0.000019 0 3853 openat
[...]
> 13.56 0.193014 50 3853 openat
So openat(2) is 4 orders of magnitude slower in the VM, which is a
problem.
I guess a large part of that is due to the fact that VM created with
‘guix system vm’ use unionfs as their root file system, which is a FUSE
thing (see the “volatile” options in (gnu system vm), (gnu system
linux-initrd), and (gnu build linux-boot).) I’m not sure how we could
avoid it.
Can you confirm that the same ‘find’ command is faster in a full-blown
“guix system disk-image” VM?
Thanks,
Ludo’.