Re: [Playerstage-developers] PUSH - PULL

[Toby C. <tco...@pl...>]

Hi,
the client library was recently fixed so that peek/readifwaiting would work
in PULL mode, does changing playerv to use this fix the problem?

Toby

On 07/12/2007, Paul Osmialowski <new...@ki...> wrote:
>
>
>
> On Wed, 5 Dec 2007, Brian Gerkey wrote:
>
> >
> > On Dec 2, 2007, at 2:44 AM, Paul Osmialowski wrote:
> >
> >> Also I would
> >> like to start player server on embedded systems the same way: for some
> >> (yet unknown) reason player performance runs down really badly on tiny
> >> embedded systems when clients are using pull mode. I wish I could
> >> change
> >> default mode back to push in mendioned circumstances.
> >
> > While I haven't tested the PULL mode too much, I'm surprised by
> > this.  I was aiming to fix the age-old performance problem of
> > overflowing queues, which caused data backup and terrible control.
> > Paul, do you have some idea of where the slow-down in PULL mode is
> > occurring?
> >
> >       brian.
> Hi Brian,
> I've looked closer at it today and what I've found reminded me, that
> once I knew the reason, I must have forgotten about it. The problem
> lies in the playerv which now uses PULL mode by default. When the link is
> slow (bad wifi connection) read call which is blocking in pull mode blocks
> whole process including GUI. When it's locked for some longer time, GUI
> locks totally and whole playerv must be killed by SIGKILL signal. I've
> tested this today: the worst thing that happend was when I moved position
> commander far to the right to make Roomba go forward, then playerv has
> locked totally so Roomba was moving forward also after playerv was killed
> from the other shell session (fortunately, player server didn't
> die, bumplock code has stopped Roomba right after it hit the wall). This
> never happens when playerv is switched to PUSH mode.
>
> Cheers,
> Paul
>
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