On Sun, 09 Jan 2011 10:05:43 -0600, Stan Hoeppner wrote: > I'm not very skilled at writing shell scripts. > > #! /bin/sh > for k in $(ls *.JPG); do convert $k -resize 1024 $k; done > > I use the above script to batch re-size digital camera photos after I > dump them to my web server. It takes a very long time with lots of new > photos as the server is fairly old, even though it is a 2-way SMP, > because the script only runs one convert process at a time serially, > only taking advantage of one CPU. The convert program is part of the > imagemagick toolkit. > > How can I best modify this script so that it splits the overall job in > half, running two simultaneous convert processes, one on each CPU? > Having such a script should cut the total run time in half, or nearly > so, which would really be great.
http://www.imagemagick.org/Usage/api/#speed The above doc provides hints on how to speed-up image magick operations. Note that multi-threading should be automatically used whether possible, as per this paragraph: *** # IM by default uses multiple threads for image processing operations. That means you can have the computer do two or more separate threads of image processing, it will be faster than a single CPU machine. *** I'm afraid you will have to find out whether your IM package was compiled with multi-threading capablities. Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/pan.2011.01.09.16.59...@gmail.com
