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Zend Optimizer Plus(O+)
1.
Zend Optimizer Plus(Opcache) -
laruence 13年11⽉月11⽇日 星期⼀一
2.
What it is •
Not Only Opcodes Cache • But Also Opcodes Optimizer • Shiped with PHP since 5.5 • http://pecl.php.net/zendopcache 13年11⽉月11⽇日 星期⼀一
3.
Opcodes Cache • PHP->Compiler->Opcodes->Zend
VM • Same As APC, Eacc • PHP->Opcodes Cache->Zend VM 13年11⽉月11⽇日 星期⼀一
4.
Opcodes Optimizer 13年11⽉月11⽇日 星期⼀一
5.
Optimizations • Pass 1 • Substitute
persistent constants • • Perform compile-time evaluation of constant binary and unary operations • • 13年11⽉月11⽇日 星期⼀一 $a = 3 + 2 => $a = 5 Optimize series of ADD_STRING and/or ADD_CHAR • • const A = 1; $a = A; => $a = 1; $a = “a” . “b”; => $a = “ab”; Convert IS_VAR to IS_CV when it is possible
6.
Optimizations • Pass 2 • Convert
non-numeric constants to numeric constants in numeric operators • • Optimize constant conditional JMPs • • JMPZ(X, L1), JMP(L2) => JMPZNZ(X, L1, L2) Optimize static BRKs and CONTs • 13年11⽉月11⽇日 星期⼀一 $a = $b + “2”; => $a = $b + 2; break to opcodes + offset => break to opcode
7.
Optimizations • Pass 3 • • • 13年11⽉月11⽇日
星期⼀一 Optimize $i = $i+expr to $i+=expr Optimize series of JMPs Change $i++ to ++$i where it is possible
8.
Optimizations • Pass 4 • 13年11⽉月11⽇日
星期⼀一 INIT_FCALL_BY_NAME -> DO_FCALL
9.
Optimizations • Pass 5 • CFG
optimization • • 13年11⽉月11⽇日 星期⼀一 codes optimization remove dead blocks
10.
Optimizations • Pass 9 • 13年11⽉月11⽇日
星期⼀一 Optimize temp variables usage
11.
Optimizations • Pass 10 • 13年11⽉月11⽇日
星期⼀一 Remove NOPs
12.
Optimizations • Pass 11 • 13年11⽉月11⽇日
星期⼀一 Compact literals table
13.
VS APC • 7%
- 10% faster than APC • And More: • 13年11⽉月11⽇日 星期⼀一
14.
Q&A 13年11⽉月11⽇日 星期⼀一
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