I second the request. I'm usually very skeptic about purported performance improvements, but I did my tests on a couple of machines and I think that given the ubiquity of JPEG pictures the upgrade to libjpeg-turbo could be one of the most important user-visible speed improvements in the last few releases of Ubuntu.
I compiled libjpeg-turbo 1.0.1 and selected with LD_LIBRARY_PATH the new libjpeg.so.62.0.0 instead of the system library provided by Ubuntu 10.04. On a Athlon 4850e (dual core 64bit cpu, 32 bit userspace) working at 2.5 Ghz, converting a not-so-large RPG PPM image (7200x4500) to and from JPEG (average of 5 runs): time convert image.ppm image.jpg libjpeg-classic real 2.709s user 2.364s sys 0.318s libjpeg-turbo real 1.646s user 1.301s sys 0.317s time convert image.jpg image.ppm libjpeg-classic real 2.130s user 1.703s sys 0.359s libjpeg-turbo real 1.292s user 0.872s sys 0.356s On a Acer Aspire One 532h netbook with a Atom N450 cpu (64 bit userspace) working at 1.67 Ghz, the same test gives: time convert image.ppm image.jpg libjpeg-classic real 5.763s user 5.996s sys 0.770s libjpeg-turbo real 2.612s user 2.900s sys 0.720s time convert image.jpg image.ppm libjpeg-classic real 4.588s user 3.816s sys 0.858s libjpeg-turbo real 2.602s user 1.692s sys 0.868s Occasionally I use the netbook to stream video from the integrated webcam to another pc with this gstreamer pipeline: gst-launch-0.10 v4l2src ! video/x-raw-yuv,width=640,height=480 ! ffmpegcolorspace ! jpegenc ! multipartmux ! udpsink host=192.168.1.2 port=5000 With the frequency forced to 1GHz the cpu usage is: libjpeg-classic 37-38% libjpeg-turbo 10-11% With the frequency forced to 1.67Ghz the cpu usage is: libjpeg-classic 22-23% libjpeg-turbo 6-7% More importantly, when the default ondemand governor is used, with libjpeg-turbo the frequency stays mostly at 1 Ghz, while with libjpeg- classic it divides almost equally between 1 Ghz and 1.67Ghz, with the obvious consequences in terms of battery life. On this machine more than on the faster desktop pc the difference between libjpeg-turbo and libjpeg-classic is clearly visible: when nautilus is thumbnailing the images in a directory, when I open an image with oeg, when I'm looking at a f-spot gallery, when I change wallpaper, etc. etc. The upgrade should be considered before 10.10. -- [needs-packaging] libjpeg-turbo https://bugs.launchpad.net/bugs/612377 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
