简单比较一下php7和java8的计算和字符串操作性能。
机器：osx 10.10 intel corei5 4GB
php7.php：
-
<?php -
$t1 = microtime(true); -
for($i=0; $i<10000000; $i++){ -
aaa($i); -
} -
$t2 = microtime(true); -
echo 'php time:' . ($t2 - $t1)*1000 . "ms\n"; -
function aaa($i){ -
$a = $i + 1; -
$b = 2.3; -
$s = "abcdefkkbghisdfdfdsfds"; -
if($a > $b){ -
++$a; -
}else{ -
$b = $b + 1; -
} -
if($a == $b){ -
$b = $b + 1; -
} -
$c = $a * $b + $a / $b - pow($a, 2); -
$d = substr($s, 0, strpos($s, 'kkb')) . strval($c); -
} -
?>
java8.java:
-
public class Main -
{ -
public static void main(String[] args) -
{ -
long t1 = System.currentTimeMillis(); -
-
for(int i=0; i<10000000; i++){ -
aaa((float)i); -
} -
-
long t2 = System.currentTimeMillis(); -
-
System.out.println("java time：" + String.valueOf(t2 - t1) + "ms"); -
-
} -
-
static void aaa(float i){ -
float a = i + 1; -
float b = 2.3f; -
String s = "abcdefkkbghisdfdfdsfds"; -
-
if(a > b){ -
++a; -
}else{ -
b = b + 1; -
} -
if(a == b){ -
b = b + 1; -
} -
-
float c = (float) (a * b + a / b - Math.pow(a, 2)); -
-
String d = s.substring(0, s.indexOf("kkb")) + String.valueOf(c); -
} -
}
node5.js:
-
var t1 = (new Date()).getTime(); -
for(var i=0; i<10000000; i++){ -
aaa(i); -
} -
-
var t2 = (new Date()).getTime(); -
-
console.log("nodejs time：" + (t2 - t1) + "ms"); -
-
-
function aaa(i){ -
var a = i + 1; -
var b = 2.3; -
var s = "abcdefkkbghisdfdfdsfds"; -
if(a > b){ -
++a; -
}else{ -
b = b + 1; -
} -
if(a == b){ -
b = b + 1; -
} -
var c = a * b + a / b - Math.pow(a, 2); -
-
var d = s.substring(0, s.indexOf("kkb")) + c.toString(); -
}
lua5.2.lua
-
function aaa(i) -
a = i + 1 -
b = 2.3 -
s = "abcdefkkbghisdfdfdsfds" -
if(a > b) then -
a = a+1 -
else -
b = b + 1 -
end -
if(a == b) then -
b = b + 1 -
end -
c = a * b + a / b - math.pow(a, 2) -
d = string.sub(s, 0, string.find(s, "kkb")) .. tostring(c) -
end -
t1 = os.clock() -
for i=0, 10000000, 1 do -
aaa(i) -
end -
t2 = os.clock() -
print("lua time：" .. (t2 - t1) * 1000 .. "ms")
转载于 https://blog.csdn.net/llj1985/article/details/50750313
分别执行1000万次计算，依次执行以下命令：
java -jar java8jar
node node5.js
php php7.php
luajit lua5.2.lua
lua lua5.2.lua
结果：
结论：由此可见就计算性能来说，java8 > nodejs5 > php7 > luajit > lua
java8是php7的5.2倍，nodejs5是php7的1.8倍，php7和luajit相当。
说lua是最快的脚本，那是往事了。静态语言的计算性能肯定比动态语言强很多。
对于密集计算，java是最好的选择；考虑到web的性能的瓶颈往往在数据库和IO，nodejs和php都是很好的选择。我个人喜欢php，无论从开发和部署，都比nodejs顺心点。
特别注意：如果function aaa(i)中没有参数i，那么nodejs是最快的，1000ms就完成了，估计nodejs对相同的执行结果进行了缓存。有好多人都犯了这个错误，测试下来就认为nodejs比java快多了。