Hi, Problem: slow switching between views with many icons
Test-case: the test consist of switching between the favorites view and the list view. Test were ran once with the ring layout in the favorite view and once with the freeform layout; the xo had 25 activities installed all checked as `favorite'. The action of switching was automated with a timer with period 130ms when the ring layout was selected and 170ms in the case of the freeform layout (as the minimum values permitting complete redraw of the views). Note that there is a noticeable delay when switching to the favorites views when the selected layout is freeform. --- RING layout --- The following tab. and fig. show cpu time usage of the processes taking more cpu time while running the test: (tot% us+sy) - (partial% us+sy) : cmdline - 63.6 : python /usr/bin/sugar-shell 91.2 - 27.5 : /usr/bin/X :0 -fp built-ins... 99.5 - 8.2 : picker -t30 http://dev.laptop.org/~rlucchese/views/favorites_ring-list/picker.stats.svg (http://dev.laptop.org/~rlucchese/views/favorites_ring-list/picker.stats ) They were obtained by running: $ picker -t30 $ grapher -c3 --- FREEFORM layout --- (tot% us+sy) - (partial% us+sy) : cmdline - 82. : python /usr/bin/sugar-shell 91.6 - 9.5 : /usr/bin/X :0 -fp built-ins... 99.4 - 7.7 : picker -t30 http://dev.laptop.org/~rlucchese/views/favorites_freeform-list/picker.stats.svg (http://dev.laptop.org/~rlucchese/views/favorites_freeform-list/picker.stats ) ! sugar-shell is taking 20% more cpu time than in the ring layout case. cProfile statistics (KCacheGrind format) for sugar-shell: --- RING layout --- http://dev.laptop.org/~rlucchese/views/favorites_ring-list/cProfile-shell Ordering by function's self-time: % func name 35.6 : cairo.Context.paint 3.9 : gtk.Container.add 2. : sugar.graphics.palette.do_paint_below_children 1.9 : __setitem__ sugar.util ---------------------------------------------- 57% Well, this isn't unexpected. But it's interesting when looking at sysprof results (below). --- FREEFORM layout --- http://dev.laptop.org/~rlucchese/views/favorites_freeform-list/cProfile-shell Ordering by function's self-time: % func name 21.6 : _add_weight in sugar/shell/view/home/grid.py 21.5 : _remove_weight in sugar/shell/view/home/grid.py 10.6 : cairo.Context.paint 8.1 : __setitem__ sugar.util 5.7 : _compute_weight in sugar/shell/view/home/grid.py ---------------------------------------------- 57.5% ! Box2D would perform better ;) Sysprof results. Well, in sysprof there are many nested levels, so it is much more clear to just look at it. --- RING layout --- http://dev.laptop.org/~rlucchese/views/favorites_ring-list/sysprof.data - most of self-time is spent in the kernel and in X/X-modules. - time spent in the kernel is due to python and X, respectively 60%-40%. - time spent `in X' goes mostly to the geode driver, and then, to Xorg itself and the libexa module. --- FREEFORM layout --- http://dev.laptop.org/~rlucchese/views/favorites_freeform-list/sysprof.data Notes for the ring layout are valid also here. There are two (new) entries in this case and they are taking more time than the X geode module: python's numpy/core/multiarray.so and numpy/core/umath.so. This is in relation with the algorithm used in the freeform layout to avoid icons collisions. thanks, riccardo _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel