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Re: Performance issues with /gnu/store in virtual machines
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From: |
宋文武 |
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Subject: |
Re: Performance issues with /gnu/store in virtual machines |
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Date: |
Tue, 22 Aug 2017 20:51:26 +0800 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux) |
address@hidden (Ludovic Courtès) writes:
> 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.
We might switch to the linux kernel's bultin overlayfs, which should be
faster.
https://wiki.archlinux.org/index.php/Overlay_filesystem