CachyOS Repository General Information

Why does CachyOS utilize its own repositories?

Performance and optimizations

We want to provide a performance-optimized distribution and this requires performance-optimized packages. Currently we are recompiling the Arch Linux repository core and extra with the generic x86-64-v3 and x86-64-v4 instruction set.

• x86-64-v4 - Enabling of AVX512, which can highly benefit at applications
• x86-64-v3 - 5%-20% performance uplift

Customized Packages

In the CachyOS-PKGBUILDs we are maintaining a bunch of packages, which are getting patches, PGO or BOLT Optimization to provide an additional performance uplift.

Tests and benchmarks

If you would like to know more about the performance uplift of our repositories, check the links below.

• Phoronix has benchmarked Cachy twice and it seems to be mostly good for CachyOS, which is shown leading in the performance aspect. These benchmarks are a little bit older, during that time, CachyOS has already evolved much more:
  https://www.phoronix.com/review/cachyos-linux-perf

• Here Phoronix did Benchmark the difference between x86-64-v4, x86-64-v3 and x86-64 (generic) Packages. Looking at examples like PHP or GCC, where we customize our PKGBUILDs there is really big performance uplift visible. https://www.phoronix.com/review/cachyos-x86-64-v3-v4

• x86-64-v3 (- there is a moderate benefit of -march=haswell (x86_64-v3) - of around 10%-20% as compared to baseline for the tests performed):
  https://lists.archlinux.org/pipermail/arch-general/2021-March/048739.html