Compilers & JIT
Rust vs C++: AVX-512 SIMD Vectorization
Benchmarking AVX-512 SIMD vectorization and cache locality in Rust vs C++ for extreme high-performance computing tasks.
Test Environment
CPUIntel Xeon Platinum 8375C
RAM128GB DDR4
OSUbuntu 22.04 LTS
ToolGoogle Benchmark / Criterion.rs
Metrics Comparison
Matrix Multiplication
Unit: GFLOPSC++
105★
Rust
102
Detailed Analysis
Both achieve near-identical execution speeds, but Rust offers fearless concurrency while C++ maintains a slight edge in raw auto-vectorization.
LLVM optimizes both languages similarly, but C++ compilers (like GCC) have historical maturity in specific heuristic auto-vectorization.
Instruction Decode
AVX-512 instructions process 512 bits per cycle
Bottleneck: Memory bandwidth quickly becomes the bottleneck.
Architectural Recommendations
- Leverage explicit SIMD intrinsics for guaranteed performance in both
Frequently Asked Questions
Does Rust compile slower?
Yes, Rust compilation is generally slower due to macro expansion and borrow checker analysis.