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 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 > 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 >> >> _______________________________________________ >> ros-users mailing list >> ros-users@code.ros.org >> https://code.ros.org/mailman/listinfo/ros-users >> > > > _______________________________________________ > ros-users mailing list > ros-users@code.ros.org > https://code.ros.org/mailman/listinfo/ros-users > > -- 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