Hi Stephan, Sorry i didn't wrote all explanation yet, it's execution time in seconds to convert the ODT standart from odt to pdf, I know that's not a complete performance test but i will add more test.
I didn' measure build time, i guess clang is better but not sure and that's not what i was checking Le mar. 23 nov. 2021 à 17:58, Stephan Bergmann <sberg...@redhat.com> a écrit : > On 22/11/2021 17:28, Arnaud Versini wrote: > > I just tested libreoffice performance between GCC + gold + libstdc++, > > clang + lld + libstdc++ and clang + lld + libc++ and noticed that gcc > > builds are slower (at least in this case). I will write a blog article > > with all the process to reproduce but small version, it just converts > > openDocument standart files (ODF 1.0 to 1.3) to PDF. There is no > > significant difference between both clang builds (changing lib C++ from > > libstdc++ to libc++) but gcc is slower than clang. Of course all builds > > don't use system libraries in this case to compare between lib C++, and > > builds are optimised and use LTO. > > > > > > OpenSUSE 7.2 Clang + libc++ Clang + std Gcc + std > > Run 1 50,923045275 45,456441587 45,878275287 > 49,487550577 > > Run 2 50,360027388 43,83441037 44,303120572 > 47,898307652 > > Run 3 50,258628137 43,552443057 44,332110013 > 47,596628518 > > Run 4 50,062155622 43,587905602 44,616728628 > 47,430735675 > > Run 5 53,567235331 43,548408389 44,561502427 > 47,727024813 > > Run 6 50,354870307 43,877387065 44,107891362 > 47,444552655 > > Run 7 49,663738973 43,92048805 44,583599634 > 47,293633635 > > Run 8 49,780141995 43,843555496 44,055990454 > 47,561677627 > > Run 9 49,763425026 43,398042427 44,011950682 47,65275752 > > Run 10 50,197944032 44,153460819 44,303763557 > 47,974880802 > > Average 50,4931212086 43,9172542862 44,4754932616 > 47,8067749474 > > What are you even measuring here, wall-clock time to build LO with the > various toolchains, or wall-clock time to execute something from the > resulting buils, or...? (And what is the unit for those numbers?) > >
