From: iyzsong@member.fsf.org (宋文武)
To: "Ludovic Courtès" <ludo@gnu.org>
Cc: help-guix@gnu.org
Subject: Re: Performance issues with /gnu/store in virtual machines
Date: Tue, 22 Aug 2017 20:51:26 +0800 [thread overview]
Message-ID: <87o9r77okx.fsf@member.fsf.org> (raw)
In-Reply-To: <87shgj7vz4.fsf@gnu.org> ("Ludovic \=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\= \=\?utf-8\?Q\?s\?\= message of "Tue, 22 Aug 2017 12:11:43 +0200")
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
next prev parent reply other threads:[~2017-08-22 13:25 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 [this message]
2017-08-22 14:33 ` Ludovic Courtès
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