Have you tried profiling it to see where the time is being spent, and where
the bottleneck is?  1.8MB * 30 = 54MB/sec, which could actually be
harddrive-limited depending on the drive you're reading from.

Josh

On Fri, Apr 16, 2010 at 11:26 AM, Dejan Pangercic <dejan.pangercic@gmail.com
> wrote:

> Hi there,
>
> I using an attached program to read an image from a disk and to then
> continously publish it on an image topic at 30 fps. On _one_ machine
> over loopback. When I tried it with a 1608x1236+0+0 color image
> (1.8MB) and then used rostopic hz to display the publishing rate of
> topic,
> the most that I got was around 12, 13 Hz.
> Any idea what would cause such a low performance? At what rates and
> sizes do you folks usually send images around?
>
> thx and cheers, D.
>
> --
> MSc. Dejan Pangercic
> PhD Student/Researcher
> Computer Science IX
> Technische Universität München
> Telephone: +49 (89) 289-17780
> E-Mail: dejan.pangercic@in.tum.de
> WWW: http://ias.cs.tum.edu/people/pangercic
>
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