[emirp]

Great use of AVX-512 VBMI!

Note that not many Intel processors support the two specific CPU instructions used (vpermb and vpmultishiftqb).

Cannon Lake Core i3 (not many of these around due to delays with intel's 10nm fabrication)

Ice Lake Core i3, i5 and i7: Released in September 2019

[ArtWomb]

Looks like model number 06/66 or better in cpuinfo. Both AWS and Gcloud standard vm instances appear to be Skylake ;(

Honestly, base64 has always been pretty fast for me, even large bitmaps >100kb. Compared to net latency it may be imperceptible to end user. But it still makes a terrific reference paper!

[jng]

Plus, if my knowledge is properly up-to-date, no AMD processor supports those instructions, not even any member the recent and famously super efficient Ryzen family processors.

[loeg]

None of the AMD CPUs have AVX-512. The new ones have full-width AVX-256.

[darkwater]

Why do they say then "We use the SIMD (Single Instruction Multiple Data) instruction set AVX-512 available on commodity processors" ?

[brazzy]

Because those are commodity processors nonetheless. The distinction relevant for a research paper is between mainstream processors you can just buy vs. custom made ones, not about market penetration.

[dickeytk]

I still think "commodity" is not the correct word even in that context. Mass-market, or commercially available might be better. How can it be a commodity when there is only one manufacturer?

[penagwin]

Just going off wikipedia (also other sources support the definition):

> In economics, a commodity is an economic good or service that has full or substantial fungibility: that is, the market treats instances of the good as equivalent or nearly so with no regard to who produced them.

Basically it's a common good, that is sold and purchased, with no other modifications required for this use-case. This commodity is currently low in supply, but is still a commodity.

[bloomer]

It’s missing the fungibility where it is produced by multiple suppliers and can be treated equivalently by the end buyer. Large grade A eggs are a commodity as it doesn’t matter which farm produced them. A specific set of processors from Intel are not a commodity since there are no fungible equivalents. Widely available would probably be a better description in this case.

[dickeytk]

I would argue processors are never commodities anymore (maybe back in the 486 days it was closer). You can't swap an intel for an amd processor into the same motherboard ever today. They don't have the same performance characteristics from one to another. You could have 2 "3.5Ghz 4-core processors" that have wildly different real-world performance. IMO this is the opposite of "fungible"

I think hard drives, memory, power supplies are much closer to being fungible.

[onion2k]

It's a slightly awkward way of saying they didn't use custom hardware.

[PudgePacket]

They're technically not wrong.. just not available on many commodity processors.