Memcache缓存居然不如直接File文件缓存？

使用本地的环境测试10万次和 100万次 缓存的读写，测试环境和结果如下。

环境

<code>W<span>in</span>7 x64 AMD7750双核 内存<span>8</span>G
Apache <span>2.4</span>.<span>9</span>
PHP <span>5.5</span>.<span>12</span> ts vc11 
memcache <span>2.2</span>.<span>7</span></code>

代码

<code><span><?php </span><span><span>function</span><span>convert</span><span>(<span>$size</span>)</span>
{</span><span>$unit</span> = <span>array</span>(<span>'b'</span>, <span>'kb'</span>, <span>'mb'</span>, <span>'gb'</span>, <span>'tb'</span>, <span>'pb'</span>);

    <span>return</span> @round(<span>$size</span> / pow(<span>1024</span>, (<span>$i</span> = floor(log(<span>$size</span>, <span>1024</span>)))), <span>2</span>) . <span>' '</span> . <span>$unit</span>[<span>$i</span>];
}

<span><span>function</span><span>cacheFile</span><span>(<span>$key</span>)</span>
{</span><span>$dir</span> = <span>'cache'</span>;
    <span>if</span> (!is_dir(<span>$dir</span>) && !mkdir(<span>$dir</span>)) {
        <span>throw</span><span>new</span><span>Exception</span>(<span>" can't make dir $dir"</span>);
    }

    <span>$filepath</span> = <span>$dir</span> . DIRECTORY_SEPARATOR . sprintf(<span>'%x'</span>, crc32(<span>$key</span>));

    <span>if</span> (!(file_exists(<span>$filepath</span>) && (<span>$data</span> = file_get_contents(<span>$filepath</span>)) && !<span>empty</span>(<span>$data</span>))) {
        <span>$data</span> = date(<span>'Y-m-d H:i:s'</span>);
        file_put_contents(<span>$filepath</span>, <span>$data</span>);
    }

    <span>return</span><span>$data</span>;
}


<span><span>function</span><span>cacheMem</span><span>(<span>$key</span>)</span>
{</span><span>$mem</span> = <span>new</span> Memcache();
    <span>$mem</span>->connect(<span>'127.0.0.1'</span>, <span>11211</span>);
    <span>$data</span> = <span>$mem</span>->get(<span>$key</span>);
    <span>if</span> (<span>empty</span>(<span>$data</span>)) {
        <span>$data</span> = date(<span>'Y-m-d H:i:s'</span>);
        <span>$mem</span>->set(<span>$key</span>, <span>$data</span>);
    }

    <span>return</span><span>$data</span>;
}


<span>$t1</span> = microtime(<span>true</span>);
<span>$i</span> = <span>0</span>;
<span>$limit</span> = <span>1000</span> * <span>100</span>; <span>//10 万次</span><span>$data</span> = <span>null</span>;
<span>while</span> (<span>$i</span> $limit</span>) {
<span>//    $data = cacheFile($i);</span><span>$data</span> = cacheMem(<span>$i</span>);
    <span>$i</span>++;
}
<span>$timeUse</span> = microtime(<span>true</span>) - <span>$t1</span>;
<span>$arr</span> = [
    <span>'cost'</span> => sprintf(<span>'%.7fs'</span>, <span>$timeUse</span>),
    <span>'mem'</span> => convert(memory_get_usage())
];
var_dump(<span>$arr</span>);
</code>

结果 1万次

<code>            花费时间           内存耗费
File        <span>1.9</span><span>sec</span><span>250</span>kb
Memcache    <span>11</span><span>sec</span><span>250</span>kb</code>

结果 10万次

<code>            花费时间    内存耗费
<span>File</span><span>94</span>s        <span>251.18</span>KB
Memcache    超时<span>120</span>s 报错 
</code>

Memcache 10万次测试失败，报错内容如下

<code>Warning: Memcache::connect(): <span>in</span> D:\localhost\speed.php <span><span>on</span><span>line</span><span>37</span></span>
Warning: Memcache::<span>get</span>(): No servers added <span>to</span> memcache connection <span>in</span> D:\localhost\speed.php
Warning: Memcache::<span>set</span>(): No servers added <span>to</span> memcache connection <span>in</span> D:\localhost\speed.php <span><span>on</span><span>line</span><span>41</span></span>
Fatal error: Maximum execution <span>time</span><span>of</span><span>120</span><span>seconds</span> exceeded <span>in</span> D:\localhost\speed.php <span><span>on</span><span>line</span><span>38</span></span></code>

结论

memcache 用来做缓存却还没有 直接File文件缓存快，之所以做这个测试，是因为面试的时候我回答自己并没有使用这个memcache 来做缓存，直接使用File文件缓存（单台服务器），结果直接被技术官认定为是很菜鸟。但我通过这样的测试，虽然是在win下面，可为什么Memcahe性能还不如File ？
还是说我测试的方式存在错误？ 求解 default.fu@foxmail.com

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