Re: Is it a bug in Gio::FileMonitor?

On Wed, 2010-06-02 at 04:26 +0300, Владимир wrote:
> On Tue, Jun 1, 2010 at 12:57 PM, Alexander Larsson <alexl redhat com>
> wrote:
>         On Mon, 2010-05-31 at 17:36 +0300, Владимир wrote:
>         There is nothing "server" about change notification
>         coalesceing. If any
>         app downloads or copies a file you'll get a change event for
>         every call
>         to write() (if you read all events). This can easily be in the
>         hundreds
>         a second for the entire duration of the download/copy. So, any
>         UI that
>         tries to handle every change will more or less lock up.
> You're talking about gio, I wanted to see what inotify would do in
> same circumstances: 
> I started inotify to listen to all the events on my desktop folder,
> then I took a large zip file (about 500MB) and started copying it to
> the desktop folder. There was no "hundreds a second" events, just 4
> (four) events: IN_CREATE, then IN_OPEN, then IN_CLOSE_WRITE and
> finally (as the copy finished) IN_ATTRIB.
> So inotify doesn't suffer from the Armageddon you describe, also it's
> fast. How come gio would be doomed/overworked in such a scenario and
> it's slow at reporting even 1 file change quickly.

Yes, because you didn't select for file change events, only creation and
close-write. This means you won't get any updates to a file that changes
but is not closed. For instance a log file or just a long download.

> Sorry I don't mean to be harsh but after these conversations I'm
> really starting to like inotify a lot more and disliking gio.

I don't think gio is perfect, the inotify backend in particular is kinda
crufty and ugly. If a hard dependency on inotify works for you, by all
means go for it!

 Alexander Larsson                                            Red Hat, Inc 
       alexl redhat com            alexander larsson gmail com 
He's an underprivileged alcoholic dwarf with a winning smile and a way with 
the ladies. She's a sarcastic junkie pearl diver on the trail of a serial 
killer. They fight crime! 

[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]