[ros-users] publishing large images at high fps using image_transport

[Josh Faust]

Whoops, should've looked at the attached source.  In general a profiler is
going to tell you what's taking time far better than we will.

Josh

On Fri, Apr 16, 2010 at 12:33 PM, Dejan Pangercic <dejan.pangercic at gmail.com
> wrote:

> Hi Josh,
>
> I did not do profiling yet. However, since I read the image only once
> when I start the program and then publish it from the memory, it can
> not be harddrive.
> D.
>
> On Fri, Apr 16, 2010 at 9:00 PM, Josh Faust <jfaust at willowgarage.com>
> wrote:
> > 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 at 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 at in.tum.de
> >> WWW: http://ias.cs.tum.edu/people/pangercic
> >>
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> >>
> >
> >
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>
>
>
> --
> MSc. Dejan Pangercic
> PhD Student/Researcher
> Computer Science IX
> Technische Universität München
> Telephone: +49 (89) 289-17780
> E-Mail: dejan.pangercic at in.tum.de
> WWW: http://ias.cs.tum.edu/people/pangercic
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