Luís Pereira: Let me know if you need some help on improving libqtxdg. By the way does kf5 have something to handle ".Desktop" files? We may consider using it as well.
Cheers ----- Mensaje original ----- De: "Luís Pereira" <luis.artur.pere...@gmail.com> Para: "PCMan" <pcman...@gmail.com> CC: "lxde-list" <Lxde-list@lists.sourceforge.net> Enviados: Viernes, 5 de Diciembre 2014 8:32:44 Asunto: Re: [Lxde-list] Benchmarks and analysis for startup performance On Thu, Nov 27, 2014 at 6:54 PM, PCMan <pcman...@gmail.com> wrote: > More on this topic. I also did benchmarks using strace. > First, I dropped all caches by doing echo 3 > /proc/sys/vm/drop_caches. > Then I used strace to trace all of the child processes of sddm, and then > login. > This is the result I got. > > https://drive.google.com/file/d/0B4BhmC8V2mivMGFRS3BCeFk0ZTQ/view?usp=sharing > > We have more than 600,000 system calls during LXQt startup. > This is pretty amazing. More than half of them are just "stat" calls used to > locate icons in the icon theme. This is caused by QIcon::fromTheme() (or the > fixed version in libqtxdg). > Unfortunately, this inefficient poor design is actually "correct" according > to the xdg icon theme spec. Gtk+ solves this with an optional icon cahce. I > believed that KDE does this, too. > To reduce unnecessary I/O, we definitely need some icon theme cache > mechanisms. > However, I'm not sure how much benefit can this brings. It does not seem to > be the major cause of slow startup. > The impact of relocations caused by huge C++ libraries and ld.so is more > prominent than these system calls. > Hence, I think it might be a good idea to use the same hack as kdeinit > (pre-link, fork, and load modules) to speed up. > To do this, we need to make main desktop components loadable modules. > Comments are welcomed. The C++ rellocations have probably the highest impact during the startup. Just by using pre-link my startup time, on a weak machine, was roughly reduced to half. Other improvements should aldo be deployed, but pre-link comes at the top of the list. I'm working on inproving libqtxdg XdgDesktopFile loading and XdgDesktopFileCache performance. -- Luís Pereira ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk _______________________________________________ Lxde-list mailing list Lxde-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lxde-list -- Eng. Alexis López Zubieta Nova Light Development Team University of Informatics Sciences, Cuba --------------------------------------------------- XII Aniversario de la creación de la Universidad de las Ciencias Informáticas. 12 años de historia junto a Fidel. 12 de diciembre de 2014. ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk _______________________________________________ Lxde-list mailing list Lxde-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lxde-list
