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PHP和HTML混合编程应该不成问题,在这期间,你完全可以让PHP给你算算 一加一等于几,然后在浏览器输出,不要觉得幼稚,这的确是跟阿波罗登月一样,你打的是一小段代码,但是对于你的编程之路,可是迈出了一大步啊!兴奋吧?但是不得不再给你泼点冷水,您还是菜鸟一个。
从PHP5.1入手下手,PHP供应了用户对Zend VM履行分发体例的选择接口.
之前的文章中, 我也提过这方面的内容, Zend虚拟机在履行的时分, 关于编译生成的op_array中的每条opline的opcode城市分发到响应的处置器(zend_vm_def.h界说)履行, 而依照分发的体例分歧, 分发进程可以分为CALL, SWITCH, 和GOTO三品种型.
默许是CALL体例, 也就是一切的opcode处置器都界说为函数, 然后虚拟机挪用. 这类体例是传统的体例, 也普通被以为是最不乱的体例.
SWITCH体例和GOTO体例则和其定名的意义不异, 分离经由过程switch和goto来分发opcode到对应的处置逻辑(段).
官方给出的描写是:
CALL – Uses function handlers for opcodes
SWITCH – Uses switch() statement for opcode dispatch
GOTO – Uses goto for opcode dispatch (threaded opcodes architecture)
GOTO is usually (depends on CPU and compiler) faster than SWITCH, which
tends to be slightly faster than CALL.
CALL is default because it doesn’t take very long to compile as opposed
to the other two and in general the speed is quite close to the others.
那末假如利用GOTO体例, 效力上究竟能进步几何呢?
明天我就分离利用各类体例来测试一番, 测试剧本bench.php.
第一点被证实的就是, 官方说的GOTO体例编译耗时明显高于其他俩种体例, 我一入手下手在虚拟机上编译, 每次都Hangup(), 最初只好换了个微弱点的物理机, 大约3分钟后, 编译胜利..
测试情况:
PHP 5.3.0 Linux
AMD Opteron(tm) Processor 270(2G) X 4 6G Memory
编译参数:
./configure --with-zend-vm=CALL/GOTO/SWITCH
测试了局以下(都是三次取中值):
CALL体例:
laruence@dev01.tc$ sapi/cli/php bench.php
simple 0.358
simplecall 0.418
simpleucall 0.405
simpleudcall 0.424
mandel 1.011
mandel2 1.238
ackermann(7) 0.375
ary(50000) 0.083
ary2(50000) 0.075
ary3(2000) 0.561
fibo(30) 1.156
hash1(50000) 0.114
hash2(500) 0.091
heapsort(20000) 0.270
matrix(20) 0.276
nestedloop(12) 0.599
sieve(30) 0.350
strcat(200000) 0.039
------------------------
Total 7.844
SWITCH体例:
laruence@dev01.tc$ sapi/cli/php bench.php
simple 0.393
simplecall 0.414
simpleucall 0.424
simpleudcall 0.445
mandel 1.007
mandel2 1.254
ackermann(7) 0.392
ary(50000) 0.084
ary2(50000) 0.073
ary3(2000) 0.593
fibo(30) 1.185
hash1(50000) 0.120
hash2(500) 0.092
heapsort(20000) 0.285
matrix(20) 0.295
nestedloop(12) 0.678
sieve(30) 0.359
strcat(200000) 0.042
------------------------
Total 8.138
GOTO体例 :
laruence@dev01.tc$ sapi/cli/php bench.php
simple 0.306
simplecall 0.373
simpleucall 0.369
simpleudcall 0.385
mandel 0.879
mandel2 1.132
ackermann(7) 0.356
ary(50000) 0.081
ary2(50000) 0.073
ary3(2000) 0.525
fibo(30) 1.043
hash1(50000) 0.111
hash2(500) 0.088
heapsort(20000) 0.247
matrix(20) 0.247
nestedloop(12) 0.519
sieve(30) 0.331
strcat(200000) 0.037
------------------------
Total 7.103
可见, GOTO体例最快, SWITCH体例最慢.和官方的描写稍有不符.
GOTO体例比其默许的CALL体例, 功能提拔仍是对照分明的.
所以, 假如你但愿让PHP发扬到机制, 改动Zend VM的分发体例, 也能够做为一个思索要素.
附:
利用GOTO体例的configure选项:
--with-zend-vm=GOTO
也能够在Zend目次下利用:
php zend_vm_gen.php --with-vm-kind=[CALLGOTOSWITH]
测试剧本bench.php
/**
* PHP Perf Bench Test Script
*/
function simple() {
$a = 0;
for ($i = 0; $i < 1000000; $i++)
$a++;
$thisisanotherlongname = 0;
for ($thisisalongname = 0; $thisisalongname < 1000000; $thisisalongname++)
$thisisanotherlongname++;
}
/****/
function simplecall() {
for ($i = 0; $i < 1000000; $i++)
strlen("hallo");
}
/****/
function hallo($a) {
}
function simpleucall() {
for ($i = 0; $i < 1000000; $i++)
hallo("hallo");
}
/****/
function simpleudcall() {
for ($i = 0; $i < 1000000; $i++)
hallo2("hallo");
}
function hallo2($a) {
}
/****/
function mandel() {
$w1=50;
$h1=150;
$recen=-.45;
$imcen=0.0;
$r=0.7;
$s=0; $rec=0; $imc=0; $re=0; $im=0; $re2=0; $im2=0;
$x=0; $y=0; $w2=0; $h2=0; $color=0;
$s=2*$r/$w1;
$w2=40;
$h2=12;
for ($y=0 ; $y<=$w1; $y=$y+1) {
$imc=$s*($y-$h2)+$imcen;
for ($x=0 ; $x<=$h1; $x=$x+1) {
$rec=$s*($x-$w2)+$recen;
$re=$rec;
$im=$imc;
$color=1000;
$re2=$re*$re;
$im2=$im*$im;
while( ((($re2+$im2)<1000000) && $color>0)) {
$im=$re*$im*2+$imc;
$re=$re2-$im2+$rec;
$re2=$re*$re;
$im2=$im*$im;
$color=$color-1;
}
if ( $color==0 ) {
print "_";
} else {
print "#";
}
}
print "
";
flush();
}
}
/****/
function mandel2() {
$b = " .:,;!/>)&IH%*#";
//float r, i, z, Z, t, c, C;
for ($y=30; printf("\n"), $C = $y*0.1 - 1.5, $y--;){
for ($x=0; $c = $x*0.04 - 2, $z=0, $Z=0, $x++ < 75;){
for ($r=$c, $i=$C, $k=0; $t = $z*$z - $Z*$Z + $r, $Z = 2*$z*$Z + $i, $z=$t, $k<5000; $k++)
if ($z*$z + $Z*$Z > 500000) break;
echo $b[$k%16];
}
}
}
/****/
function Ack($m, $n){
if($m == 0) return $n+1;
if($n == 0) return Ack($m-1, 1);
return Ack($m - 1, Ack($m, ($n - 1)));
}
function ackermann($n) {
$r = Ack(3,$n);
print "Ack(3,$n): $r\n";
}
/****/
function ary($n) {
for ($i=0; $i<$n; $i++) {
$X[$i] = $i;
}
for ($i=$n-1; $i>=0; $i--) {
$Y[$i] = $X[$i];
}
$last = $n-1;
print "$Y[$last]\n";
}
/****/
function ary2($n) {
for ($i=0; $i<$n;) {
$X[$i] = $i; ++$i;
$X[$i] = $i; ++$i;
$X[$i] = $i; ++$i;
$X[$i] = $i; ++$i;
$X[$i] = $i; ++$i;
$X[$i] = $i; ++$i;
$X[$i] = $i; ++$i;
$X[$i] = $i; ++$i;
$X[$i] = $i; ++$i;
$X[$i] = $i; ++$i;
}
for ($i=$n-1; $i>=0;) {
$Y[$i] = $X[$i]; --$i;
$Y[$i] = $X[$i]; --$i;
$Y[$i] = $X[$i]; --$i;
$Y[$i] = $X[$i]; --$i;
$Y[$i] = $X[$i]; --$i;
$Y[$i] = $X[$i]; --$i;
$Y[$i] = $X[$i]; --$i;
$Y[$i] = $X[$i]; --$i;
$Y[$i] = $X[$i]; --$i;
$Y[$i] = $X[$i]; --$i;
}
$last = $n-1;
print "$Y[$last]\n";
}
/****/
function ary3($n) {
for ($i=0; $i<$n; $i++) {
$X[$i] = $i + 1;
$Y[$i] = 0;
}
for ($k=0; $k<1000; $k++) {
for ($i=$n-1; $i>=0; $i--) {
$Y[$i] += $X[$i];
}
}
$last = $n-1;
print "$Y[0] $Y[$last]\n";
}
/****/
function fibo_r($n){
return(($n < 2) ? 1 : fibo_r($n - 2) + fibo_r($n - 1));
}
function fibo($n) {
$r = fibo_r($n);
print "$r\n";
}
/****/
function hash1($n) {
for ($i = 1; $i <= $n; $i++) {
$X[dechex($i)] = $i;
}
$c = 0;
for ($i = $n; $i > 0; $i--) {
if ($X[dechex($i)]) { $c++; }
}
print "$c\n";
}
/****/
function hash2($n) {
for ($i = 0; $i < $n; $i++) {
$hash1["foo_$i"] = $i;
$hash2["foo_$i"] = 0;
}
for ($i = $n; $i > 0; $i--) {
foreach($hash1 as $key => $value) $hash2[$key] += $value;
}
$first = "foo_0";
$last = "foo_".($n-1);
print "$hash1[$first] $hash1[$last] $hash2[$first] $hash2[$last]\n";
}
/****/
function gen_random ($n) {
global $LAST;
return( ($n * ($LAST = ($LAST * IA + IC) % IM)) / IM );
}
function heapsort_r($n, &$ra) {
$l = ($n >> 1) + 1;
$ir = $n;
while (1) {
if ($l > 1) {
$rra = $ra[--$l];
} else {
$rra = $ra[$ir];
$ra[$ir] = $ra[1];
if (--$ir == 1) {
$ra[1] = $rra;
return;
}
}
$i = $l;
$j = $l << 1;
while ($j <= $ir) {
if (($j < $ir) && ($ra[$j] < $ra[$j+1])) {
$j++;
}
if ($rra < $ra[$j]) {
$ra[$i] = $ra[$j];
$j += ($i = $j);
} else {
$j = $ir + 1;
}
}
$ra[$i] = $rra;
}
}
function heapsort($N) {
global $LAST;
define("IM", 139968);
define("IA", 3877);
define("IC", 29573);
$LAST = 42;
for ($i=1; $i<=$N; $i++) {
$ary[$i] = gen_random(1);
}
heapsort_r($N, $ary);
printf("%.10f\n", $ary[$N]);
}
/****/
function mkmatrix ($rows, $cols) {
$count = 1;
$mx = array();
for ($i=0; $i<$rows; $i++) {
for ($j=0; $j<$cols; $j++) {
$mx[$i][$j] = $count++;
}
}
return($mx);
}
function mmult ($rows, $cols, $m1, $m2) {
$m3 = array();
for ($i=0; $i<$rows; $i++) {
for ($j=0; $j<$cols; $j++) {
$x = 0;
for ($k=0; $k<$cols; $k++) {
$x += $m1[$i][$k] * $m2[$k][$j];
}
$m3[$i][$j] = $x;
}
}
return($m3);
}
function matrix($n) {
$SIZE = 30;
$m1 = mkmatrix($SIZE, $SIZE);
$m2 = mkmatrix($SIZE, $SIZE);
while ($n--) {
$mm = mmult($SIZE, $SIZE, $m1, $m2);
}
print "{$mm[0][0]} {$mm[2][3]} {$mm[3][2]} {$mm[4][4]}\n";
}
/****/
function nestedloop($n) {
$x = 0;
for ($a=0; $a<$n; $a++)
for ($b=0; $b<$n; $b++)
for ($c=0; $c<$n; $c++)
for ($d=0; $d<$n; $d++)
for ($e=0; $e<$n; $e++)
for ($f=0; $f<$n; $f++)
$x++;
print "$x\n";
}
/****/
function sieve($n) {
$count = 0;
while ($n-- > 0) {
$count = 0;
$flags = range (0,8192);
for ($i=2; $i<8193; $i++) {
if ($flags[$i] > 0) {
for ($k=$i+$i; $k <= 8192; $k+=$i) {
$flags[$k] = 0;
}
$count++;
}
}
}
print "Count: $count\n";
}
/****/
function strcat($n) {
$str = "";
while ($n-- > 0) {
$str .= "hello\n";
}
$len = strlen($str);
print "$len\n";
}
/*****/
function getmicrotime()
{
$t = gettimeofday();
return ($t['sec'] + $t['usec'] / 1000000);
}
function start_test()
{
ob_start();
return getmicrotime();
}
function end_test($start, $name)
{
global $total;
$end = getmicrotime();
ob_end_clean();
$total += $end-$start;
$num = number_format($end-$start,3);
$pad = str_repeat(" ", 24-strlen($name)-strlen($num));
echo $name.$pad.$num."\n";
ob_start();
return getmicrotime();
}
function total()
{
global $total;
$pad = str_repeat("-", 24);
echo $pad."\n";
$num = number_format($total,3);
$pad = str_repeat(" ", 24-strlen("Total")-strlen($num));
echo "Total".$pad.$num."\n";
}
$t0 = $t = start_test();
simple();
$t = end_test($t, "simple");
simplecall();
$t = end_test($t, "simplecall");
simpleucall();
$t = end_test($t, "simpleucall");
simpleudcall();
$t = end_test($t, "simpleudcall");
mandel();
$t = end_test($t, "mandel");
mandel2();
$t = end_test($t, "mandel2");
ackermann(7);
$t = end_test($t, "ackermann(7)");
ary(50000);
$t = end_test($t, "ary(50000)");
ary2(50000);
$t = end_test($t, "ary2(50000)");
ary3(2000);
$t = end_test($t, "ary3(2000)");
fibo(30);
$t = end_test($t, "fibo(30)");
hash1(50000);
$t = end_test($t, "hash1(50000)");
hash2(500);
$t = end_test($t, "hash2(500)");
heapsort(20000);
$t = end_test($t, "heapsort(20000)");
matrix(20);
$t = end_test($t, "matrix(20)");
nestedloop(12);
$t = end_test($t, "nestedloop(12)");
sieve(30);
$t = end_test($t, "sieve(30)");
strcat(200000);
$t = end_test($t, "strcat(200000)");
total($t0, "Total");
?>
把例子全部敲进去试验,完成一遍以后就会有心得了,因为你会发现为啥我的程序和书上的一模一样就是结果不正确。新手学习的时候必须承认,不容易,因为我也是过来人,你会发现原来有那么多常用的语句,函数都要记。 |
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