2008-01-08 18:17:30

by George Nychis

[permalink] [raw]
Subject: hanging in fsync for 3+ seconds

Hi all,

I noticed that all of a sudden my disk writes using VIM/EMACS are taking
3+ seconds for even just a single byte. So, I've used strace to narrow
it down to fsync.

The following log is an fsync opening up a new file 'test' inserting a
't' and writing and quitting in vim:
http://www.andrew.cmu.edu/user/gnychis/slog

If you do a search for the only fsync, you will see it takes more than 3
seconds:
15171 0.000094 fsync(6) = 0 <3.386504>

What can I do to determine why the fsync is taking so long? I am not
getting any disk error messages in system logs.

Info about my system:
Ubuntu Gutsy Gibbon desktop machine, updated as of last night
Linux 2.6.22-14-generic #1 SMP i686 GNU/Linux, running reiserFS.

Thanks!
George


2008-01-08 20:09:18

by George Nychis

[permalink] [raw]
Subject: Re: hanging in fsync for 3+ seconds

solved... lpd was causing the hang.

- George


George Nychis wrote:
> Hi all,
>
> I noticed that all of a sudden my disk writes using VIM/EMACS are taking
> 3+ seconds for even just a single byte. So, I've used strace to narrow
> it down to fsync.
>
> The following log is an fsync opening up a new file 'test' inserting a
> 't' and writing and quitting in vim:
> http://www.andrew.cmu.edu/user/gnychis/slog
>
> If you do a search for the only fsync, you will see it takes more than 3
> seconds:
> 15171 0.000094 fsync(6) = 0 <3.386504>
>
> What can I do to determine why the fsync is taking so long? I am not
> getting any disk error messages in system logs.
>
> Info about my system:
> Ubuntu Gutsy Gibbon desktop machine, updated as of last night
> Linux 2.6.22-14-generic #1 SMP i686 GNU/Linux, running reiserFS.
>
> Thanks!
> George
>