Hello, I don’t know about GtkListBox, but when using GtkTree, are you detaching your model from the treeview while you are doing mass operations on it? I remember reading it in a tutorial years (decades?) ago that you should do this. Sorry, but i have no answers at hand for your other questions. Best, Gergely On Mon, Oct 08, 2018 at 12:24:03PM +0200, ente wrote: > Hi, > > I am facing performance issues in GTK upon presenting a big amount of > tabular data. First I used GtkListbox for it's layout flexibility. > Handling more than 10,000 items gets inacceptable slow. Switching to > GtkTreeview I can handle some 300,000 items after applying a few > optimizations (column sizing fixed, fixed height mode): a full load > takes about 4 seconds, i.e. the application feels anything but > "responsive" although this is ... ok. Currently I see 2 options: > dropping Gtk in favor of a HTML frontend (that feels awkward to say) or > implementing paging on the GtkTreeview. > > At this moment I am analyzing the reasons for the performance issues. I > measured the time it takes to generate a number of labels in a simple > loop (no call ot GtkMain) and to add those labels to a GtkBox: > * 100 labels in 1.7 ms > * 1,000 labels in 20.9 ms > * 10,000 labels in 610 ms > * 100,000 labels in 1m18s > After the loop I pack the GtkBox into a window and show it. That takes > another century to show up. > If I adjust the loop to skip the packing of the labels into the box, > the times are down to: > * 10,000 labels in 115 ms > * 100,000 labels in 940ms > > The windows shows up instantly (although empty of course). > > So my performance issue is related to the packing. In my tests with the > GtkTreeview it seems speficially to boil down to the sizing and > signalling of the items: The performance of the treeview was highly > impacted by the fixed height mode & the fixed column sizing (more than > ordering by a column or calling GtkMain while adding rows). So my > question goes down to: How can I further optimize my way of using GTK > in order to speed up UI? Is there any way to add 1,000,000 labels to a > GtkBox in less than a second? Could I somehow suspend the signalling > during UI creation and replace it by a "I am done, now calculate all > the sizes" signal? Am I wrong about my assumption that the sizing > signalling is the cause for the low performance? > > With regards to the treeview: After initially creating the data rows I > am calculating values that affect 4 columns out of 10 columns. So far I > determine the GtkTreeIter of the affected row and update all cells in > that row using gtk_list_store_set. Should I adjust to update the > affected columns only? When I implement paging for the TreeView: should > I rather drop the existing ListStore and create a new or is it faster > to overwrite all elements in the Liststore with the new items? > > > I tried to use the GtkBuilder in order to setup a box with 100,000 > labels. This performance was somewhat the same as creating the labels > in a loop (I didn't keep the measurements). > > I could isolate the problem to UI rendering. If I don't assign my > ListStore to the Treeview, all is fine. As soon as my ListStore is > filled, I assign the model to the treeview. That's the most time > consuming step. > > Last question: is there any way to create callbacks from the javascript > world using the Webkit2Gtk webview? More specificly: I am working in go > language. I am aware of the webview widget. Unfortunately that's a > window. I would prefer to rather place a widget into a native > GtkApplicationWindow. Using Eval I can inject anything into the DOM. > How do I get events from the DOM back to go? > > > Background on the application: > I am developing a text analysis application. Text fragments get > precalculated attributes assigned. Based on these attributes and the > Levensthein distance between fragments, someone is supposed to (for > now: manually) define text fragment categories (categories). Roughly > speaking the application has a paned window: on the left I show the > category list or an editor for a new / existing category; on the right > I show a list of text fragments with the major 3 attributes or a > details view on a specific fragment: all attributes and a list of > similar fragments. > > The smallest amount of text fragments to be analyzed and categorized is > about 300,000 items. The number of items goes easily up to 5,000,000 or > even much more. Categorizing all fragments requires about 100 to at > maximum 1,000 categories, i.e. there is quite some clustering among > those text fragments. On the interface I work with highlight colors: a > human can easily realize which fragements are already clustered and > which aren't. Usually only a small number of text fragment categories > are of special interest. One could compare it to a log file: I don't > care so much about how often someone sucessfully authorized; it is much > more interesting if someone suddenly fails to authorize. > > > thanx, > > > ente > _______________________________________________ > gtk-list mailing list > gtk-list@xxxxxxxxx > https://mail.gnome.org/mailman/listinfo/gtk-list -- You must believe in things that are not true. Otherwise, how will they become? _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx https://mail.gnome.org/mailman/listinfo/gtk-list
