Re: Beagle CPU usage (was Proposed module: tracker)

[Bastien Nocera <hadess hadess net>]

Hey Federico,

On Mon, 2007-01-15 at 19:02 -0600, Federico Mena Quintero wrote:
> El lun, 15-01-2007 a las 16:31 +0000, Bastien Nocera escribió:
> > On Mon, 2007-01-15 at 10:15 -0600, Federico Mena Quintero wrote:
> > <snip>
> > > We put a call to setrlimit() in gst-office-thumbnailer, so that the
> > > helper convert(1) process is limited to 256 MB of memory and 5 seconds
> > > of CPU time.  Some files do *not* get thumbnailed, of course, but this
> > > is better than making the machine unusable.
> > 
> > Neat. I'll try and do something similar for Totem's thumbnailer (it
> > currently uses a 30 sec time-limit, so it would be nice to also set a
> > certain amount of CPU).
> 
> The right fix is to put this in libgnomeui/gnome-thumbnail.c, so that
> all thumbnailers get the same treatment.  We just did this for
> gsf-office-thumbnailer because it was super-urgent (patch attached).  I
> guess you could use a child_setup_func for g_spawn*() in gnome-thumbnail
> to set up the resource limits :)

I'll mention this code is busted as far as the memory usage is
concerned. From the setrlimit man page:
       RLIMIT_AS
              This is the maximum size of a process’ total available
memory, in bytes. If this limit is exceeded, the malloc() and mmap()
functions shall fail with errno set to [ENOMEM]. In addition, the
automatic stack growth fails with  the  effects
              outlined above.

I implemented your code some time ago in Totem's unstable branch, and I
was wondering why movies weren't getting thumbnailed anymore. I couldn't
mmap files larger than 256 megs.

This code shouldn't go in the platform.

Cheers

-- 
Bastien Nocera <hadess hadess net>