SIMD learning project to parse HTTP request

this project will SIGSEGV when you run it in debug mode. still unfinished, I will come back later.

Goal

• learn how to utilize SIMD instruction to bulk process multiple data
• custom hash function for http header : http header don't need DOS resistance
• buffer reuse : allocation is expensive
• thread per core model (no Arc<Mutex<T>>): mfence is expensive

Note

• utils are contains buffer overrun (but buffer are over allocated to prevent SEGFAULT in release mode)
• require nightly rust and avx512 cpu to run

Reason learn

• Portable SIMD will cause slowdown when T*LANES is more than data path
  • Zen 4 (double pump avx512) will have less performance compare to avx2
  • if compile target to below AVX2 will likely have slightly lower performance than hand rolled SIMD