clang vs gcc build performance (executable not build time)

[Arnaud Versini]

Hi everyone,

I just pushed my autogen files on github :
https://github.com/ArnaudVERSINI/LibreOffice_autogens

Thanks

Le lun. 22 nov. 2021 à 17:28, Arnaud Versini <arnaud.versini at gmail.com> a
écrit :

> Hi everyone,
>
> 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
>
> For information I use openSUSE Tumbleweed latest release.
>
> I also noticed that libengine12 is really bigger with GCC but I've not
> have that data on me now.
>
> I hope this could be an idea of improvement ! Next crazy test I would like
> to do is between MSVC and clang on windows ! But it seems harder !
> --
> Arnaud Versini
>


-- 
Arnaud Versini
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/libreoffice/attachments/20211205/634431e5/attachment.htm>