Amazon Graviton3 Compiler Tuning Benchmarks For The Arm Neoverse-V1 Cores

[phoronix]

Phoronix: Amazon Graviton3 Compiler Tuning Benchmarks For The Arm Neoverse-V1 Cores

Stemming from my recent AWS Graviton3 benchmarks and looking at Graviton3 against Intel Xeon and AMD EPYC, a number of Phoronix readers expressed interest in seeing some compiler tuning benchmarks for the Graviton3 around its Arm Neoverse-V1 cores with SVE support. Here are some benchmarks for those interested in the compiler tuning impact for this new high performance Arm cloud processor.

https://www.phoronix.com/vr.php?view=31221

[NobodyXu]

Could this be that the GCC 12's auto vectorization pass for SVE still isn't good enough?

I heard that auto vectorization in compiler has long been a hard problem and manual vectorization often gives much better result.

[ms178]

I also would have thought that SVE/SVE2 would bring more benefits, also the regressions seem odd. It seems Arm engineers still have some work to do...

[brucethemoose]

Could this be that the GCC 12's auto vectorization pass for SVE still isn't good enough?

I heard that auto vectorization in compiler has long been a hard problem and manual vectorization often gives much better result.

I can't find the discussion now, but awhile ago I read that some of Rust's guarantee's should theoretically allow for more autovectorization, but llvm currently doesn't take advantage of it.

I believe this was the group: https://github.com/rust-lang/project-portable-simd

[NobodyXu]

I can't find the discussion now, but awhile ago I read that some of Rust's guarantee's should theoretically allow for more autovectorization, but llvm currently doesn't take advantage of it.

I believe this was the group: https://github.com/rust-lang/project-portable-simd

Thanks for the link!
I will have a look later.

[trifud]

Michael, how do you test the different flags in PTS? Do you set the CFLAGS/CXXFLAGS environment variable, or...?

[Michael]

Michael, how do you test the different flags in PTS? Do you set the CFLAGS/CXXFLAGS environment variable, or...?

Yes setting the CFLAGS/CXXFLAGS.

[coder]

I also would have thought that SVE/SVE2 would bring more benefits,

FWIW, this has only SVE1. The V1 is a Cortex-X1 -derived core that's still ARMv8-A. SVE2 wasn't added until ARMv9-A.

also the regressions seem odd. It seems Arm engineers still have some work to do...

Oh, for sure. Something seems very wrong, here.

Hopefully, our PerformanceExpert is on the case!