[fuse-devel] FUSE performance

[Gordon W. <gor...@gm...>]

---------- Forwarded message ----------
From: Gordon Wrigley <gor...@gm...>
Date: Oct 21, 2006 10:41 AM
Subject: Re: [fuse-devel] FUSE performance
To: Phil Snowberger <psn...@cs...>


I have an idea of one way to allieviate all 3 of those for file
systems that are getting some all of thier files directly from another
filesystem. Its something I've toyed with doing but have been to lazy
to actually do and as the backing filesystems in my case are NFS
mounts I don't imagine I'd save much anyway.

Anyway the core idea is that you have an option when returning the
open and create calls to say to fuse that the thing you put in the
fuse_file_info is actually one of your own file handles and fuse is to
do all IO directly on that, up to but not including the close.

On 10/21/06, Phil Snowberger <psn...@cs...> wrote:
> First of all, I have to say that I realize that in any system like FUSE,
> some overhead is involved, and that's fine.  I accept it.
>
> What I would like to know is, where do FUSE's performance hurdles come
> from?  I can think of the following potential answers:
>
>         - kernel/userspace context switches
>         - bulk memory copying (more than without FUSE)
>         - (?) userspace fs fighting for processor time on a loaded system
>
> I'm interested in investigating ways to alleviate some of the
> performance issues, perhaps in special cases.  Can anybody provide a
> pointer to where I can find this?  I know it's implicitly in the source,
> but I don't have the skill to recognize from kernel code where a
> bottleneck will occur.
>
> thanks,
> --Phil
>
> --
> Phil Snowberger -- psn...@cs...
> Department of Computer Science and Engineering
> University of Notre Dame
>
>
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