Report about compilers available for Krita

[Dmitry Kazakov]

Just a small update:

On Windows we can also use Clang from MSYS. And it gives 30-40% better
performance in the benchmarks. See the attached spreadsheet for the details.

On Thu, Aug 19, 2021 at 10:11 AM Dmitry Kazakov <dimula73 at gmail.com> wrote:

> Hi, all!
>
> I spent last week testing different compilers on Linux and Windows. I
> decided to gather all the information I found in a nice report so we could
> reuse it later :)
>
> Report about compilers available for Krita
> ==========================================
>
> Linux
> -----
>
> 1) Ubuntu 16.04
>
>    * uses GCC 5.5.0 by default
>    * has GCC 9.4.0 available via `ppa:ubuntu-toolchain-r/test` repository
>
>      - GCC 9.4.0 gives 10-30% better performance on Linux (I have tested
> on both, Intel and Ryzen7)
>      - I have already switched our AppImage builds to use GCC 9.4.0
>
> 2) Ubuntu 20.04
>
>    * uses GCC 9.3.0 by default
>    * has GCC 11.1.0 available via `ppa:ubuntu-toolchain-r/test` repository
>
>      - GCC 11.1.0 gives almost the same performance as 9.4.0 (about 2%
> better though)
>      - GCC 11.1.0 needs our deps patched a bit, because of changes in
> include header dependencies. In practice, you just need to add `#include
> <limits>` here and there.
>      - The patches that fix deps compilation on GCC 11.1.0 have already
> been pushed to master
>
> Windows
> -------
>
> 1) MinGW64-builds (the ones we use atm)
>
>    * uses GCC 7.3.0
>    * works somewhat fine
>
> 2) TDM-GCC (https://jmeubank.github.io/tdm-gcc/)
>
>    * uses GCC 10.3.0
>    * compiles Krita and its deps fine
>    * (!) causes speed regressions in the brush benchmarks
>    * (!) the compiler itself is 32-bit, so it might be not very efficient
> on 64-bit devices
>
> 3) MSYS (msys2.org)
>
>    * uses GCC 10.3.0
>    * the compiler is 64-bit, which is good
>    * when installing MSYS-MINGW64 one must skip installing GDB, because it
> requires Python, which conflicts with Krita's python
>    * (!) has three libraries dynamically linked to GCC, which conflict
> with Krita's deps:
>
>       - expat
>       - iconv
>       - zlib
>
>       Compiling of these deps should be manually patched out from Krita's
> deps (they are listed as deps to other deps)
>
>    * (!) drmingw fails to build (though I guess it is solvable)
>    * (!) compilation script of SIP and PyQt should be patched to use
> `--install-base` instead of `--prefix`. I don't know why.
>    * (!) still causes the same regressions in the brush benchmarks
>    * (!) when packaging, Krita package fails to run on another system
> because of the absent zlib, libintl and expat. Perhaps they should be added
> to teh package manually. I didn't try it though.
>
> Raw data of the benchmarks can be found here:
>
>
> https://docs.google.com/spreadsheets/d/1mvTC3Ny73_0F35MscUZBHyYCXRfoX06so5zI5LL2DqU
>
> --
> Dmitry Kazakov
>


-- 
Dmitry Kazakov
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