Wizards, A few months back I ported rrdtool (www.rrdtool.org) over from libart/freetype to cairo/pango. It all went quite well and the resulting graphs look cool. But when it comes to performance things look realy bad.
Creating a little test graph with rrdtool 1.2 (libart/freetype) takes about 0.01s while the same graph with (cairo/pango) takes 0.2s in other words, I am seeing a 20 times slow down. Creating several graphs in the same session does not change things much. I have sat down with callgrind to analyze and found that 80% of the time is spend in the pango_font_map_load_fontset function. I bet I am doing something terribly wrong here, since I use the same font in only 2 sizes all over the graph. I have based my code on the example in the documentation http://developer.gimp.org/api/2.0/pango/pango-Cairo-Rendering.html#rotated-example but maybe this is not optimal. I tried to add some caching but it did not help much. I have put a few details up on http://tobi.oetiker.ch/rrd_pango/ any ideas ? cheers tobi -- Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland http://it.oetiker.ch [EMAIL PROTECTED] ++41 62 775 9902 / sb: -9900 _______________________________________________ rrd-developers mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-developers
