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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 16:33:12 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux) |
address@hidden (宋文武) skribis:
> 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
Good point, we should probably do that.
Ludo’.