From: ludo@gnu.org (Ludovic Courtès)
To: 宋文武 <iyzsong@member.fsf.org>
Cc: help-guix@gnu.org
Subject: Re: Performance issues with /gnu/store in virtual machines
Date: Tue, 22 Aug 2017 16:33:12 +0200 [thread overview]
Message-ID: <87ziar3c5z.fsf@gnu.org> (raw)
In-Reply-To: <87o9r77okx.fsf@member.fsf.org> ("宋文武"'s message of "Tue, 22 Aug 2017 20:51:26 +0800")
iyzsong@member.fsf.org (宋文武) skribis:
> ludo@gnu.org (Ludovic Courtès) writes:
>
>> Hi Chris,
>>
>> Christopher Baines <mail@cbaines.net> 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’.
prev parent reply other threads:[~2017-08-22 14:33 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-17 20:05 Performance issues with /gnu/store in virtual machines Christopher Baines
2017-08-20 9:02 ` Ricardo Wurmus
2017-08-20 10:22 ` Christopher Baines
2017-08-22 10:11 ` Ludovic Courtès
2017-08-22 11:20 ` Christopher Baines
2017-08-22 14:35 ` Ludovic Courtès
2017-08-22 12:51 ` 宋文武
2017-08-22 14:33 ` Ludovic Courtès [this message]
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