{"id":2518,"date":"2024-07-15T02:00:17","date_gmt":"2024-07-15T02:00:17","guid":{"rendered":"https:\/\/mvermeulen.org\/perf\/?p=2518"},"modified":"2024-07-15T12:04:50","modified_gmt":"2024-07-15T12:04:50","slug":"cachyos-optimized-packages","status":"publish","type":"post","link":"https:\/\/mvermeulen.org\/perf\/2024\/07\/15\/cachyos-optimized-packages\/","title":{"rendered":"CachyOS optimized packages"},"content":{"rendered":"\n

I have a Zen4 7940HS system where I have installed CachyOS<\/a>. This is an Arch-based Linux OS with a focus on performance. In particular, the Why CachyOS? <\/a>page cites an optimized scheduler as well as packages compiled for the particular architecture. For example, rather than packages compiled to run on the lowest-common-denominator architecture, CachyOS has optimized packages for different “levels” The “-v3” level enables architectures newer than Intel Haswell or AMD Excavator and the “-v4” level enables use of AVX-512.<\/p>\n\n\n\n

The July 2024 release notes<\/a> highlight the addition of a Zen4 optimized repository<\/p>\n\n\n\n

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This is our 8th release this year, and we are very proud to announce a new optimized repository. Starting with this release, we are providing a Zen4<\/strong> optimized repository. This repository will be automatically used at new installation for Zen4 and Zen5 CPUs, to provide the best performance.<\/p>\n\n\n\n

The znver4 target provides a bunch of extra avx512<\/strong> extensions and also other instructions. Here you can find a list of the additional used instructions by the compiler compared to the x86-64-v4 target: abm, adx, aes, avx512bf16, avx512bitalg, avx512ifma, avx512vbmi, avx512vbmi2, avx512vnni, avx512vpopctndq, clflushopt, clwb, clzero, fsgsbase, gfni, mwaitx, pclmul, pku. prfchw, rpdid, rdrnd, rdseed, sha, sse4a, vaes, vockmulqdq, wbnoinvd, savec, xsaveopt, xsaves<\/code><\/p>\n<\/blockquote>\n\n\n\n

This seemed intriguing so I decided to try a somewhat random collection of Phoronix tests using this repository. I compare the performance running CachyOS with Zen4 vs Ubuntu 22.04. A summary table follows:<\/p>\n\n\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t
Metric<\/th>Direction<\/th>CachyOS Zen4<\/th>Ubuntu 22.04<\/th>Ratio<\/th>\n<\/tr>\n<\/thead>\n
coremark<\/td>higher<\/td>410390 iterations\/sec<\/td>438579 iterations\/sec<\/td>0.936<\/td>\n<\/tr>\n
build-linux-kernel<\/td>lower<\/td>114.035 seconds<\/td>116.25 seconds<\/td>1.019<\/td>\n<\/tr>\n
openssl: SHA256<\/td>higher<\/td>13254334897 \/ second<\/td>13420827833 \/ second<\/td>0.988<\/td>\n<\/tr>\n
openssl: SHA512<\/td>higher<\/td>4539223377 \/ second<\/td>4413779170 \/ second<\/td>1.028<\/td>\n<\/tr>\n
openssl: RSA4096<\/td>higher<\/td>5949.0 sign\/s<\/td>5713.1 sign\/s<\/td>1.041<\/td>\n<\/tr>\n
openssl: ChaCha20<\/td>higher<\/td>56376095723 byte\/second<\/td>55209170900 byte\/second<\/td>1.021<\/td>\n<\/tr>\n
openssl: AES-128-GCM<\/td>higher<\/td>108245069000 byte\/second<\/td>106316322953 byte\/second<\/td>1.018<\/td>\n<\/tr>\n
openssl: AES-256-GCM<\/td>higher<\/td>93611141897 byte\/second<\/td>91688082637 byte\/second<\/td>1.021<\/td>\n<\/tr>\n
openssl: ChaCha20-Poly1035<\/td>higher<\/td>40096535620 byte\/second<\/td>39278150087 byte\/second<\/td>1.021<\/td>\n<\/tr>\n
phpbench<\/td>higher<\/td>2243593 score<\/td>1055625 score<\/td>2.125<\/td>\n<\/tr>\n
ospray: particle_volume\/ao<\/td>higher<\/td>3.73062 \/ second<\/td>3.64172 \/ second<\/td>1.024<\/td>\n<\/tr>\n
ospray: particle_volume\/scivis<\/td>higher<\/td>3.685 \/ second<\/td>3.62516 \/ second<\/td>1.017<\/td>\n<\/tr>\n
ospray: particle_volume\/pathtracer<\/td>higher<\/td>120.966 \/ second<\/td>121.287 \/ second<\/td>0.997<\/td>\n<\/tr>\n
ospray: gravity\/ao<\/td>higher<\/td>2.62208 \/ second<\/td>2.79344 \/ second<\/td>0.939<\/td>\n<\/tr>\n
ospray: gravity\/scvis<\/td>higher<\/td>2.66757 \/ second<\/td>2.76412 \/ second<\/td>0.965<\/td>\n<\/tr>\n
ospray: gravity\/pathtracer<\/td>higher<\/td>3.58901 \/ second<\/td>3.45087 \/ second<\/td>1.040<\/td>\n<\/tr>\n
rawtherapee<\/td>lower<\/td>51.331 seconds<\/td>51.189 seconds<\/td>0.997<\/td>\n<\/tr>\n
namd: ATPase<\/td>higher<\/td>1.30961 \/ day<\/td>1.26995 \/ day<\/td>1.031<\/td>\n<\/tr>\n
namd: STMV<\/td>higher<\/td>0.39164<\/td>0.37621 \/ day<\/td>1.048<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n

The benchmarks selected were a subset of those from this Phoronix article<\/a>. That article compares the various CachyOS repositories against each other while I am doing a comparison vs. Ubuntu. Overall there was a smaller increase than I expected\/hoped. Some particular items I will note from the able above:<\/p>\n\n\n\n