Rav1e Achieves Another ~20% Speed-Up For Rust-Based AV1 Video Encoding

[milkylainen]

Hmm. In C, depending on the code, it's sometimes _very_ hard to do it better than a good compiler.
Sure, if your code and data structures are rubbish, you're not making it easy for the compiler to do a good job, but that seems beside the point.
The point of hand-rolling asm slowing going the way of the Dodo.

So what am I actually seeing here? Since the benefits of speed increase seem to come from better hand optimized asm.

Is this a:
"The Rust compiler is not mature enough" ?
"The Rust compiler does not know any instruction set extensions. So it cannot do any real vectorization" ?
Something else?

[geearf]

It seems unlikely this will ever be faster than Dav1d, seeing as all their speed improvements come from Dav1d...

Well that's good, it'd be weird to have the encoder faster than the decoder no?

[cl333r]

So when will it be practical to use? i.e. capable of encoding at 20 FPS 1080p 10 bit say on a 4 core CPU from 2016.

[c2p_]

It seems unlikely this will ever be faster than Dav1d, seeing as all their speed improvements come from Dav1d...

Rav1e is Encoder, Dav1d is Decoder.

[FireBurn]

It seems unlikely this will ever be faster than Dav1d, seeing as all their speed improvements come from Dav1d...

[phoronix]

Phoronix: Rav1e Achieves Another ~20% Speed-Up For Rust-Based AV1 Video Encoding

Rav1e's weekly-ish pre-releases for this Rust-written AV1 encoder have been focusing a lot on better performance via hand-written x86 Assembly, making use of SIMD extensions, and other fine tuning of their encoder. With this newest pre-release, another ~20% speed-up was obtained...

http://www.phoronix.com/scan.php?page=news_item&px=Rav1e-20-Percent-Faster