Memcache快取居然不如直接File檔案快取？

使用本地的環境測試10萬次和 100萬次 快取的讀寫，測試環境和結果如下。

環境

<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>

程式碼

<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>$i</span> < <span>$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>);
</span></code>

結果1萬次

<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>

結果10萬次

<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 10萬次測試失敗，報錯內容如下例直接File檔案快取快，之所以做這個測試，是因為面試的時候我回答自己並沒有使用這個memcache 來做緩存，直接使用File檔案快取（單一伺服器），結果直接被技術官認定為是

很菜鳥

。但我通過這樣的測試，雖然是在win下面，但為什麼Memcahe效能不如File ？

還是說我測試的方式有錯誤？ 求解 default.fu@foxmail.com

版權聲明：本文為部落客原創文章，未經部落客允許不得轉載。

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