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 <sbergman@xxxxxxxxxx> 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?)
