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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

  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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