"rospack profile" is a good command to force re-building of the cache.
--Eric

On Thu, Sep 2, 2010 at 2:45 PM, Cedric Pradalier <
cedric.pradalier@mavt.ethz.ch> wrote:

> On 09/02/10 23:04, Brian Gerkey wrote:
> > On Thu, Sep 2, 2010 at 8:39 AM, Cedric Pradalier
> > <cedric.pradalier@mavt.ethz.ch>  wrote:
> >
> >> That actually raises a question: what is the recommended procedure on a
> >> read-only system. Is it better to put the cache on a tmpfs mount or is
> >> it possible to generate the cache once and for all, and use it
> afterward?
> >>
> > Either one should work, though I haven't tried them.  To avoid the
> > chance of having stale data in the cache, I would go for the tmpfs
> > solution (I know that it's a read-only filesystem, but bad cached
> > values are a pain to debug).
> >
> > Note that for the one-time cache to work, you need to set
> > ROS_CACHE_TIMEOUT=-1.0 in the environment.  Otherwise, rospack will
> > keep trying to rebuild the cache (and won't use the cached values).
> >
> >       brian.
> > ____
>
> Can I understand that I can run the following procedure:
> set my system rw,
> set my cache_timeout to something small,
> run rostopic list (for instance),
> set the system ro
> set cache_timeout to -1
> any subsequent call to ros, will then be able to use the cached data?
>
> Thanks
>
> --
>
> Dr. Cedric Pradalier
> http://www.asl.ethz.ch/people/cedricp
>
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