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

[Dejan Pangercic]

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