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        <title>云计算 - 标签 - 五岁博客</title>
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    <title>物理内存只有 4GB,凭什么能跑出 16GB 的虚拟机？</title>
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    <pubDate>Sun, 20 Sep 2026 00:00:00 &#43;0000</pubDate>
    <author>五岁博客</author>
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    <description><![CDATA[<p>一台物理主机只有 4GB 内存，却同时跑着 4 台、每台配置 4GB 的虚拟机，账面上要 16GB。</p>
<p>主机没崩，业务还正常跑。</p>
<p>这事儿听起来违反常识，但在虚拟化和云平台里天天发生。</p>]]></description>
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