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Introducing architecture variants

discourse.ubuntu.com

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Re: Introducing architecture variants

#4

Post by embedding-shape »

smlacy wrote: post #3

I presume the motivation is performance optimization? It would be more compelling to include some of the benefits in the announcement?

They do mention it in the linked announcement, although not really highlighted, just as a quick mention:

> As a result, we’re very excited to share that in Ubuntu 25.10, some packages are available, on an opt-in basis, in their optimized form for the more modern x86-64-v3 architecture level

> Previous benchmarks we have run (where we rebuilt the entire archive for x86-64-v3 57) show that most packages show a slight (around 1%) performance improvement and some packages, mostly those that are somewhat numerical in nature, improve more than that.

Re: Introducing architecture variants

#5

Post by mobilio »

Announce was here: https://discourse.ubuntu.com/t/introducing-architecture-vari...

and key point: "Previous benchmarks we have run (where we rebuilt the entire archive for x86-64-v3 57) show that most packages show a slight (around 1%) performance improvement and some packages, mostly those that are somewhat numerical in nature, improve more than that."

Re: Introducing architecture variants

#7

Post by jsheard »

theandrewbailey wrote: post #6

A reference for x86-64 microarchitecture levels: https://en.wikipedia.org/wiki/X86-64#Microarchitecture_level... x86-64-v3 is AVX2-capable CPUs.

> x86-64-v3 is AVX2-capable CPUs.

Which unfortunately extends all the way to Intels newest client CPUs since they're still struggling to ship their own AVX512 instructions, which are required for v4. Meanwhile AMD has been on v4 for two generations already.

Re: Introducing architecture variants

#8

Post by juujian »

mobilio wrote: post #5

Announce was here: https://discourse.ubuntu.com/t/introducing-architecture-vari... and key point: "Previous benchmarks we have run (where we rebuilt the entire archive for x86-64-v3 57) show that most packages show a slight (around 1%) performance improvement and some packages, mostly those that are somewhat numerical in nature, improve more than that."

Are there any use cases where that 1% is worth any hassle whatsoever?

Re: Introducing architecture variants

#9

Post by adgjlsfhk1 »

juujian wrote: post #8
mobilio wrote: post #5

Announce was here: https://discourse.ubuntu.com/t/introducing-architecture-vari... and key point: "Previous benchmarks we have run (where we rebuilt the entire archive for x86-64-v3 57) show that most packages show a slight (around 1%) performance improvement and some packages, mostly those that are somewhat numerical in nature, improve more than that."

Are there any use cases where that 1% is worth any hassle whatsoever?

it's very no uniform. 99% see no change, but 1% see 1.5-2x better performance

Re: Introducing architecture variants

#10

Post by theandrewbailey »

jsheard wrote: post #7
theandrewbailey wrote: post #6

A reference for x86-64 microarchitecture levels: https://en.wikipedia.org/wiki/X86-64#Microarchitecture_level... x86-64-v3 is AVX2-capable CPUs.

> x86-64-v3 is AVX2-capable CPUs. Which unfortunately extends all the way to Intels newest client CPUs since they're still struggling to ship their own AVX512 instructions, which are required for v4. Meanwhile AMD has been on v4 for two generations already.

At least Intel and AMD have settled on a mutually supported subset of AVX-512 instructions.
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