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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.

Good point, we should probably do that.


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