* opcache와 jit 차이
OpCache (php5.5): 인터프리터가 생성한 OPCode를 메모리에 저장하여 실행

    - 저장한 OPCode를 실행할때도 VM을 거처서 CPU에서 실행됨

 

JIT (php8.0) : JIT(Just-In-Time) 컴파일러가 생성한 기계어를 메모리 저장하여 실행

    - 저장한 기계어 코드는 CPU에서 바로 실행됨

 


https://php.watch/versions/8.0/JIT


//-------------------------------------
php.ini 파일 설정
opcache.enable=1
opcache.enable_cli=1
opcache.jit_buffer_size=256M
opcache.jit=tracing

//-------------------------------------
opcode.jit 옵션
    disable : 완전 불가
    off : 불가, 런타임에서 동작시키기 가능
    on : tracing과 동일
    tracing :  1254 (CRTO)
    function :  1205 (CRTO)
    4자리숫자 : CRTO

C: CPU-specific Optimization Flags
    0: Disable CPU-specific optimization.
    1: Enable use of AVX, if the CPU supports it.

R: Register Allocation
    0: Don't perform register allocation.
    1: Perform block-local register allocation.
    2: Perform global register allocation.

T: Trigger
    0: Compile all functions on script load.
    1: Compile all functions on first execution.
    2: Profile first request and compile the hottest functions afterwards.
    3: Profile on the fly and compile hot functions.
    4: Currently unused.
    5: Use tracing JIT. Profile on the fly and compile traces for hot code segments.

O: Optimization Level
    0: No JIT.
    1: Minimal JIT (call standard VM handlers).
    2: Inline VM handlers.
    3: Use type inference.
    4: Use call graph.
    5: Optimize whole script.

//-------------------------------------

opcache.jit 옵션 값에 따른 성능 측정 결과

    - tracing은 20-30%, function은 10-15% 성능 향상

 

    - 초당 실행수

  코드1 코드2 코드3 opcache_get_status()['jit']
결과값 kind, opt_level, opt_flags
disable 2439 2030 343 000
off 2439 2040 351 000
on 2962 2631 462 546
tracing(1254) 2857 2285 441 546
1254 2985 2631 466 546
function(1205) 2666 2352 401 056
1205 2941 2597 458 056
1255 2962 2614 475 556

 

//-----------------------------------------------------------------------------

 

The Definitive PHP 7.2, 7.3, 7.4, 8.0, and 8.1 Benchmarks (2022) 
https://kinsta.com/blog/php-benchmarks/



PHP 8.1 Performance Is Continuing To Improve With Early Benchmarks
https://www.phoronix.com/scan.php?page=news_item&px=PHP-8.1-Benchmarks-Perf-Early



PHP 8: JIT performance in real-life web applications
https://stitcher.io/blog/jit-in-real-life-web-applications


Just-In-Time (JIT) Compilation in PHP 8.0
https://lindevs.com/just-in-time-jit-compilation-in-php-8-0/

 

//-------------------------------------

https://www.php.net/releases/8.0/en.php



//-------------------------------------

 

벤치마크 소스
https://github.com/php/php-src/blob/master/Zend/bench.php


https://stitcher.io/blog/preloading-in-php-74
https://www.cloudpanel.io/docs/v1/guides/php/opcache-preload

 

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Posted by codens