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Re: Performance issues with /gnu/store in virtual machines

From: 宋文武
Subject: Re: Performance issues with /gnu/store in virtual machines
Date: Tue, 22 Aug 2017 20:51:26 +0800
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

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