{"id":119934,"date":"2026-10-30T17:40:39","date_gmt":"2026-10-30T09:40:39","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/119934.html"},"modified":"2026-10-30T17:40:39","modified_gmt":"2026-10-30T09:40:39","slug":"%e5%86%85%e5%ad%98%e8%bf%98%e5%89%a9-8gb-%e7%a9%ba%e9%97%b2%ef%bc%8cmalloc-%e4%b8%ba%e4%bb%80%e4%b9%88%e8%bf%98%e4%bc%9a%e5%a4%b1%e8%b4%a5%ef%bc%9f-%e8%bf%9e%e7%bb%ad%e5%88%86","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/119934.html","title":{"rendered":"\u5185\u5b58\u8fd8\u5269 8GB \u7a7a\u95f2\uff0cmalloc \u4e3a\u4ec0\u4e48\u8fd8\u4f1a\u5931\u8d25\uff1f\u2014\u2014\u8fde\u7eed\u5206\u914d\u3001\u788e\u7247\u4e0e\u4e09\u79cd\u201c\u9002\u5e94\u201c\u7b97\u6cd5"},"content":{"rendered":"<h2>\u5185\u5b58\u8fd8\u5269 8GB \u7a7a\u95f2&#xff0c;malloc \u4e3a\u4ec0\u4e48\u8fd8\u4f1a\u5931\u8d25&#xff1f;\u2014\u2014\u8fde\u7eed\u5206\u914d\u3001\u788e\u7247\u4e0e\u4e09\u79cd&#034;\u9002\u5e94&#034;\u7b97\u6cd5<\/h2>\n<p>\u6709\u4e00\u6b21\u7ebf\u4e0a\u4e8b\u6545&#xff0c;\u67e5\u5230\u6700\u540e\u8c01\u90fd\u6ca1\u60f3\u5230&#xff1a;\u673a\u5668 free \u663e\u793a\u8fd8\u6709 8GB \u7a7a\u95f2\u5185\u5b58&#xff0c;\u53ef\u4e00\u4e2a\u8fdb\u7a0b malloc \u4e00\u5757 4GB \u7684\u8fde\u7eed\u5185\u5b58&#xff0c;\u76f4\u63a5\u8fd4\u56de NULL\u3002\u8fd0\u7ef4\u770b\u7740\u76d1\u63a7\u61f5\u4e86\u2014\u2014\u201c\u5185\u5b58\u660e\u660e\u5269\u8fd9\u4e48\u591a\u554a&#xff1f;\u201d<\/p>\n<p>\u95ee\u9898\u4e0d\u5728&#034;\u603b\u91cf\u591f\u4e0d\u591f&#034;&#xff0c;\u800c\u5728&#034;\u591f\u4e0d\u591f\u8fde\u7eed&#034;\u3002\u90a3 8GB \u662f\u6563\u843d\u5728\u5185\u5b58\u5404\u5904\u7684\u4e00\u5806\u5c0f\u7a7a\u6d1e&#xff0c;\u52a0\u8d77\u6765\u591f&#xff0c;\u4f46\u6ca1\u6709\u4e00\u5757\u8fde\u7eed\u7684 4GB\u3002\u8fd9\u5c31\u662f\u5916\u90e8\u788e\u7247&#xff08;external fragmentation&#xff09;\u2014\u2014\u64cd\u4f5c\u7cfb\u7edf\u5185\u5b58\u7ba1\u7406\u91cc\u6700\u7ecf\u5178\u3001\u4e5f\u6700\u5bb9\u6613\u8ba9\u4eba\u683d\u8ddf\u5934\u7684\u95ee\u9898\u3002<\/p>\n<p>\u8fd9\u4e5f\u662f 408 \u64cd\u4f5c\u7cfb\u7edf&#xff08;35 \u5206&#xff09;&#034;\u5185\u5b58\u7ba1\u7406&#034;\u4e00\u7ae0\u7684\u6838\u5fc3\u8003\u70b9&#xff1a;\u4e09\u79cd\u8fde\u7eed\u5206\u914d\u7b97\u6cd5&#xff08;\u9996\u6b21\/\u6700\u4f73\/\u6700\u574f\u9002\u5e94&#xff09;\u3001\u5185\u90e8\u788e\u7247\u4e0e\u5916\u90e8\u788e\u7247\u3001\u7d27\u51d1\u3001\u4f19\u4f34\u7cfb\u7edf\u3002\u9009\u62e9\u9898\u5e74\u5e74\u5728\u8fd9\u4e0a\u9762\u505a\u6587\u7ae0\u3002\u4eca\u5929\u628a\u5b83\u4e00\u6b21\u7b97\u6e05\u695a\u3002<\/p>\n<hr \/>\n<h3>\u4e00\u3001\u5148\u5b9a\u4e49\u4e24\u7c7b\u788e\u7247&#xff0c;\u522b\u6df7<\/h3>\n<p>\u5185\u5b58\u5206\u914d\u540e&#xff0c;\u788e\u7247\u5206\u4e24\u79cd&#xff0c;\u540d\u5b57\u50cf\u3001\u672c\u8d28\u5b8c\u5168\u4e0d\u540c&#xff1a;<\/p>\n<ul>\n<li>\u5185\u90e8\u788e\u7247&#xff08;internal fragmentation&#xff09;&#xff1a;\u5df2\u7ecf\u5206\u7ed9\u8fdb\u7a0b\u7684\u90a3\u5757\u5185\u5b58\u91cc&#xff0c;\u6ca1\u7528\u5b8c\u7684\u90e8\u5206\u3002\u6bd4\u5982\u8fdb\u7a0b\u8981 3KB&#xff0c;\u7cfb\u7edf\u6309 4KB \u7684\u56fa\u5b9a\u5355\u4f4d\u7ed9&#xff0c;\u591a\u51fa\u6765\u7684 1KB \u88ab&#034;\u5305&#034;\u5728\u5206\u914d\u5757\u5185\u90e8&#xff0c;\u522b\u4eba\u7528\u4e0d\u4e86\u2014\u2014\u8fd9\u53eb\u5185\u90e8\u788e\u7247\u3002<\/li>\n<li>\u5916\u90e8\u788e\u7247&#xff08;external fragmentation&#xff09;&#xff1a;\u7a7a\u95f2\u5185\u5b58\u4e4b\u95f4\u7684\u90a3\u4e9b\u5c0f\u7a7a\u6d1e\u3002\u5b83\u4eec\u5f7c\u6b64\u4e0d\u76f8\u90bb&#xff0c;\u6bcf\u4e00\u5757\u5355\u72ec\u770b\u90fd\u4e0d\u591f\u5927&#xff0c;\u4f46\u52a0\u5728\u4e00\u8d77\u53ef\u80fd\u7ef0\u7ef0\u6709\u4f59\u2014\u2014\u5c31\u50cf\u5f00\u5934\u90a3 8GB\u3002<\/li>\n<\/ul>\n<p>\u4e00\u53e5\u8bdd\u8bb0&#xff1a;\u5185\u90e8\u788e\u7247\u5728&#034;\u5757\u91cc\u9762&#034;&#xff0c;\u5916\u90e8\u788e\u7247\u5728&#034;\u5757\u4e4b\u95f4&#034;\u3002<\/p>\n<hr \/>\n<h3>\u4e8c\u3001\u4e09\u79cd&#034;\u9002\u5e94&#034;\u7b97\u6cd5&#xff1a;\u5404\u6709\u4ec0\u4e48\u813e\u6c14<\/h3>\n<p>\u8fde\u7eed\u5206\u914d\u7684\u5927\u524d\u63d0&#xff1a;\u7ed9\u8fdb\u7a0b\u5206\u914d\u4e00\u5757\u7269\u7406\u4e0a\u8fde\u7eed\u7684\u5185\u5b58\u3002\u7a7a\u95f2\u5185\u5b58\u7528\u4e00\u5f20&#034;\u7a7a\u95f2\u5206\u533a\u8868\/\u94fe\u8868&#034;\u7ef4\u62a4&#xff08;\u8bb0\u5f55\u6bcf\u5757\u7a7a\u95f2\u533a\u7684\u8d77\u59cb\u5730\u5740\u548c\u5927\u5c0f&#xff09;\u3002\u6765\u4e86\u4e00\u4e2a\u5927\u5c0f\u4e3a n \u7684\u8bf7\u6c42&#xff0c;\u7b97\u6cd5\u8d1f\u8d23&#034;\u4ece\u54ea\u5757\u7a7a\u95f2\u533a\u5207&#034;\u3002\u533a\u522b\u53ea\u5728\u6311\u9009\u7b56\u7565&#xff0c;\u6240\u4ee5\u624d\u6709\u4e09\u79cd&#034;\u9002\u5e94&#034;&#xff1a;<\/p>\n<h4>2.1 \u9996\u6b21\u9002\u5e94&#xff08;First Fit&#xff09;<\/h4>\n<p>\u4ece\u5934\u5f00\u59cb\u627e&#xff0c;\u78b0\u5230\u7b2c\u4e00\u4e2a&#034;\u591f\u5927&#034;\u7684\u7a7a\u95f2\u533a\u5c31\u5207\u3002<\/p>\n<ul>\n<li>\u590d\u6742\u5ea6&#xff1a;\u6700\u574f O(m)&#xff08;m \u662f\u7a7a\u95f2\u533a\u4e2a\u6570&#xff09;&#xff0c;\u4f46\u5e73\u5747\u5f88\u5feb\u2014\u2014\u56e0\u4e3a\u591f\u5927\u7684\u5757\u5f80\u5f80\u5728\u524d\u9762\u5c31\u627e\u5230\u4e86\u3002<\/li>\n<li>\u7279\u70b9&#xff1a;\u4f4e\u5730\u5740\u533a\u88ab\u9891\u7e41\u5207\u5272&#xff0c;\u7559\u4e0b\u5f88\u591a\u5c0f\u788e\u7247&#xff1b;\u9ad8\u5730\u5740\u533a\u76f8\u5bf9\u5b8c\u6574&#xff0c;\u7559\u7ed9\u5927\u8bf7\u6c42\u3002<\/li>\n<li>\u4e00\u53e5\u8bdd&#xff1a;\u5148\u5230\u5148\u5f97&#xff0c;\u56fe\u5feb\u3002<\/li>\n<\/ul>\n<h4>2.2 \u6700\u4f73\u9002\u5e94&#xff08;Best Fit&#xff09;<\/h4>\n<p>\u627e&#034;\u6700\u8d34\u5408\u8bf7\u6c42\u5927\u5c0f&#034;\u7684\u90a3\u4e2a\u7a7a\u95f2\u533a\u2014\u2014\u5373\u6240\u6709\u591f\u5927\u7684\u5757\u91cc&#xff0c;\u5269\u4f59\u6700\u5c0f\u7684\u90a3\u4e2a\u3002<\/p>\n<ul>\n<li>\u590d\u6742\u5ea6&#xff1a;\u8981\u904d\u5386\u5168\u8868 O(m)&#xff08;\u6216\u6309\u5927\u5c0f\u6392\u5e8f\u7684\u7a7a\u95f2\u94fe\u8868&#xff09;\u3002<\/li>\n<li>\u7279\u70b9&#xff08;\u6700\u53cd\u76f4\u89c9\u7684\u4e00\u70b9&#xff09;&#xff1a;\u5b83\u8ffd\u6c42&#034;\u5207\u5f97\u521a\u521a\u597d&#034;&#xff0c;\u7ed3\u679c\u6bcf\u6b21\u5269\u4e0b\u7684\u90fd\u662f\u6700\u5c0f\u7684\u788e\u5c51&#xff0c;\u8fd9\u4e9b\u788e\u5c51\u5c0f\u5230\u51e0\u4e4e\u518d\u4e5f\u88c5\u4e0d\u4e0b\u4efb\u4f55\u8bf7\u6c42 \u2192 \u53cd\u800c\u4ea7\u751f\u6700\u591a\u7684\u5c0f\u788e\u7247&#xff08;\u5916\u90e8\u788e\u7247&#xff09;\u3002\u6700\u4f73\u9002\u5e94&#xff0c;\u540d\u5b57\u597d\u542c&#xff0c;\u788e\u7247\u6700\u60e8\u3002<\/li>\n<li>\u4e00\u53e5\u8bdd&#xff1a;\u7cbe\u6253\u7ec6\u7b97&#xff0c;\u5374\u628a\u5185\u5b58\u5207\u6210\u4e00\u5730\u788e\u6e23\u3002<\/li>\n<\/ul>\n<h4>2.3 \u6700\u574f\u9002\u5e94&#xff08;Worst Fit&#xff09;<\/h4>\n<p>\u627e\u6700\u5927\u7684\u7a7a\u95f2\u533a\u5207&#xff0c;\u8ba9\u5269\u4e0b\u7684\u5757\u5c3d\u53ef\u80fd\u8fd8\u5927\u3001\u8fd8\u80fd\u7528\u3002<\/p>\n<ul>\n<li>\u590d\u6742\u5ea6&#xff1a;\u4e5f\u8981\u904d\u5386\u5168\u8868 O(m)\u3002<\/li>\n<li>\u7279\u70b9&#xff1a;\u5269\u4f59\u5757\u5927&#xff0c;\u6682\u65f6\u4e0d\u788e&#xff1b;\u4f46\u6700\u5927\u7684\u5757\u5f88\u5feb\u88ab\u8d8a\u5207\u8d8a\u5c0f&#xff0c;\u5927\u8bf7\u6c42\u5f88\u5feb\u627e\u4e0d\u5230\u5bb6\u3002<\/li>\n<li>\u4e00\u53e5\u8bdd&#xff1a;\u62c6\u4e1c\u5899\u8865\u897f\u5899&#xff0c;\u5927\u5757\u5148\u88ab\u6d88\u8017\u5149\u3002<\/li>\n<\/ul>\n<p>\u4e09\u79cd\u7b97\u6cd5\u6ca1\u6709\u7edd\u5bf9\u6700\u4f18&#xff0c;\u53ea\u6709\u53d6\u820d\u2014\u2014\u8fd9\u8ddf\u8fdb\u7a0b\u8c03\u5ea6&#034;\u6ca1\u6709\u6700\u597d\u3001\u53ea\u6709\u6700\u5408\u9002&#034;\u662f\u540c\u4e00\u4e2a\u9053\u7406&#xff08;\u89c1\u8fdb\u7a0b\u8c03\u5ea6\u4e3a\u4ec0\u4e48\u6ca1\u6709\u300c\u6700\u597d\u300d\u53ea\u6709\u300c\u6700\u5408\u9002\u300d&#xff1f;&#xff09;\u3002<\/p>\n<hr \/>\n<h3>\u4e09\u3001\u7528\u4e00\u4e2a\u5177\u4f53\u4f8b\u5b50&#xff0c;\u628a\u5916\u90e8\u788e\u7247&#034;\u7b97&#034;\u51fa\u6765<\/h3>\n<p>\u8bbe\u5185\u5b58\u603b\u5171 100MB&#xff0c;\u6309\u987a\u5e8f\u53d1\u751f&#xff1a;<\/p>\n<p>\u2460 \u5206\u914d A &#061; 20MB      &#xff08;\u5269 80MB \u8fde\u7eed&#xff09;<br \/>\n\u2461 \u5206\u914d B &#061; 30MB      &#xff08;\u5269 50MB \u8fde\u7eed&#xff09;<br \/>\n\u2462 \u5206\u914d C &#061; 40MB      &#xff08;\u5269 10MB \u8fde\u7eed&#xff09;<br \/>\n\u2463 \u91ca\u653e B&#xff08;30MB&#xff09;      &#xff08;\u7a7a\u95f2\u533a\u53d8\u6210\u4e24\u5757&#xff1a;30MB \u548c 10MB&#xff0c;\u4e0d\u8fde\u7eed&#xff09;<br \/>\n\u2464 \u8bf7\u6c42 D &#061; 35MB<\/p>\n<p>\u6b64\u523b\u7a7a\u95f2\u5185\u5b58\u603b\u91cf &#061; 30 &#043; 10 &#061; 40MB&#xff0c;\u8fdc\u5927\u4e8e 35MB&#xff0c;\u4f46\u6ca1\u6709\u4efb\u4f55\u4e00\u5757\u8fde\u7eed\u7a7a\u95f2\u533a \u2265 35MB \u2192 D \u5206\u914d\u5931\u8d25\u3002\u8fd9\u5c31\u662f\u5916\u90e8\u788e\u7247&#xff1a;\u603b\u91cf\u591f&#xff0c;\u8fde\u7eed\u4e0d\u591f\u3002<\/p>\n<p>\u60f3\u6551\u5b83&#xff0c;\u552f\u4e00\u7684\u529e\u6cd5\u662f\u7d27\u51d1&#xff08;Compaction&#xff09;&#xff1a;\u628a A\u3001C \u8fd9\u4e9b&#034;\u6d3b\u7684&#034;\u8fdb\u7a0b\u6574\u4f53\u5f80\u4e00\u7aef\u632a&#xff0c;\u628a\u6563\u843d\u7684 30MB \u548c 10MB \u6324\u6210\u4e00\u6574\u5757 40MB\u3002\u4f46\u7d27\u51d1\u6709\u4e24\u4e2a\u4ee3\u4ef7&#xff1a;<\/p>\n<li>\u8fdb\u7a0b\u8981\u80fd\u88ab\u79fb\u52a8\u2014\u2014\u8fd9\u610f\u5473\u7740\u5730\u5740\u4e0d\u80fd&#034;\u5199\u6b7b&#034;&#xff0c;\u9700\u8981\u52a8\u6001\u91cd\u5b9a\u4f4d&#xff08;\u8fd0\u884c\u65f6\u5730\u5740\u53d8\u6362&#xff09;&#xff0c;CPU \u5f97\u6709\u76f8\u5e94\u7684\u786c\u4ef6\u652f\u6301\u3002<\/li>\n<li>\u6b63\u5728\u505a I\/O \u7684\u8fdb\u7a0b\u4e0d\u80fd\u79fb\u2014\u2014\u5b83\u6b63\u8ddf\u5916\u8bbe\u4ea4\u6362\u6570\u636e&#xff0c;\u5730\u5740\u4e00\u6539\u5c31\u4e71\u4e86\u3002<\/li>\n<p>\u6240\u4ee5\u7d27\u51d1\u4e0d\u662f\u514d\u8d39\u5348\u9910&#xff0c;\u8fd9\u4e5f\u662f\u5b83\u53ea\u80fd\u5076\u5c14\u505a\u3001\u4e0d\u80fd\u5929\u5929\u505a\u7684\u539f\u56e0\u3002<\/p>\n<hr \/>\n<h3>\u56db\u3001\u4f19\u4f34\u7cfb\u7edf&#xff1a;\u7528&#034;2 \u7684\u5e42&#034;\u628a\u5206\u88c2\u548c\u5408\u5e76\u7ba1\u8d77\u6765<\/h3>\n<p>\u8fde\u7eed\u5206\u914d\u8fd8\u6709\u4e00\u6761\u66f4\u5de5\u7a0b\u5316\u7684\u8def\u7ebf\u2014\u2014\u4f19\u4f34\u7cfb\u7edf&#xff08;Buddy System&#xff09;\u3002\u5b83\u4e0d\u7ef4\u62a4\u4e00\u5f20&#034;\u4efb\u610f\u5927\u5c0f&#034;\u7684\u7a7a\u95f2\u94fe\u8868&#xff0c;\u800c\u662f\u628a\u5185\u5b58\u6309 2 \u7684\u5e42\u6b21\u5207\u6210\u82e5\u5e72\u5757&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         2<\/p>\n<p>         0<\/p>\n<p>        ,<\/p>\n<p>         2<\/p>\n<p>         1<\/p>\n<p>        ,<\/p>\n<p>         2<\/p>\n<p>         2<\/p>\n<p>        ,<\/p>\n<p>        \u2026<\/p>\n<p>        ,<\/p>\n<p>         2<\/p>\n<p>         k<\/p>\n<p>       2^0, 2^1, 2^2, \\\\dots, 2^k<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1.0435em;vertical-align: -0.1944em\"><\/span><span class=\"mord\"><span class=\"mord\">2<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">0<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\"><span class=\"mord\">2<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\"><span class=\"mord\">2<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"minner\">\u2026<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\"><span class=\"mord\">2<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8491em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mathnormal mtight\" style=\"margin-right: 0.0315em\">k<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;\u6bcf\u4e2a\u5927\u5c0f\u5404\u7ef4\u62a4\u4e00\u6761\u7a7a\u95f2\u94fe\u8868\u3002<\/p>\n<p>\u5206\u914d&#xff08;\u8bf7\u6c42 n&#xff0c;\u5148\u5bf9\u9f50\u5230 2 \u7684\u5e42&#xff09;&#xff1a;\u627e&#034;\u6700\u5c0f\u7684\u3001\u591f\u5927\u7684&#034;\u90a3\u4e2a 2 \u7684\u5e42\u5757&#xff1b;\u5982\u679c\u5b83\u6bd4\u9700\u8981\u7684\u5927&#xff0c;\u5c31\u4e0d\u65ad\u4e00\u5206\u4e3a\u4e8c&#xff0c;\u76f4\u5230\u6070\u597d\u88c5\u4e0b&#xff08;\u6216\u518d\u5206\u5c31\u4e0d\u591f&#xff09;&#xff0c;\u628a\u53e6\u4e00\u534a\u653e\u56de\u5bf9\u5e94\u94fe\u8868\u3002<\/p>\n<p>\u91ca\u653e&#xff1a;\u68c0\u67e5\u5b83\u7684\u4f19\u4f34\u2014\u2014\u5373&#034;\u5730\u5740\u76f8\u90bb\u3001\u5927\u5c0f\u76f8\u540c\u3001\u4e14\u8d77\u59cb\u5730\u5740\u6309\u5757\u5927\u5c0f\u5bf9\u9f50&#034;\u7684\u90a3\u5757\u2014\u2014\u5982\u679c\u4f19\u4f34\u4e5f\u7a7a\u95f2&#xff0c;\u5c31\u5408\u5e76\u6210\u66f4\u5927\u7684\u5757&#xff0c;\u518d\u7ee7\u7eed\u5f80\u4e0a\u5408\u5e76\u3002<\/p>\n<p>\u4e3a\u4ec0\u4e48\u8fd9\u6837\u8bbe\u8ba1&#xff1f; \u56e0\u4e3a&#034;\u4f19\u4f34&#034;\u5173\u7cfb\u662f\u4e25\u683c\u6210\u5bf9\u7684&#xff1a;\u4e00\u5757 8KB \u53ea\u80fd\u7531\u4e24\u5757\u76f8\u90bb\u7684 4KB \u62fc\u6210&#xff0c;\u8fd9\u4e24\u5757 4KB \u4e5f\u4e92\u4e3a\u552f\u4e00\u4f19\u4f34\u3002\u4e8e\u662f\u5408\u5e76\u64cd\u4f5c\u662f O(1) \u5224\u5b9a\u7684&#xff08;\u7b97\u4e00\u4e0b\u5730\u5740\u5c31\u77e5\u9053\u4f19\u4f34\u662f\u8c01&#xff09;&#xff0c;\u6574\u4e2a\u5206\u914d\/\u91ca\u653e\u590d\u6742\u5ea6 O(log n)\u3002<\/p>\n<p>\u4ee3\u4ef7&#xff1a;\u56e0\u4e3a\u53ea\u80fd\u6309 2 \u7684\u5e42\u5206\u914d&#xff0c;\u8bf7\u6c42 3KB \u4f1a\u62ff\u5230 4KB \u5757&#xff0c;\u90a3 1KB \u5c31\u6210\u4e86\u5185\u90e8\u788e\u7247\u3002\u6240\u4ee5\u4f19\u4f34\u7cfb\u7edf\u662f&#034;\u7528\u5185\u90e8\u788e\u7247\u6362\u5916\u90e8\u788e\u7247\u7684\u53ef\u63a7&#034;\u2014\u2014\u788e\u7247\u8fd8\u53ef\u80fd\u6709&#xff0c;\u4f46\u4e0d\u4f1a\u518d\u51fa\u73b0&#034;\u603b\u91cf\u591f\u3001\u8fde\u7eed\u4e0d\u591f&#034;\u7684\u5931\u63a7\u5c40\u9762\u3002<\/p>\n<p>\u7ed9\u4e2a\u6570\u5b57&#xff1a;\u8bf7\u6c42 100KB&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         2<\/p>\n<p>         6<\/p>\n<p>        &#061;<\/p>\n<p>        64<\/p>\n<p>        &lt;<\/p>\n<p>        100<\/p>\n<p>        \u2264<\/p>\n<p>         2<\/p>\n<p>         7<\/p>\n<p>        &#061;<\/p>\n<p>        128<\/p>\n<p>       2^6&#061;64 &lt; 100 \\\\le 2^7&#061;128<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8141em\"><\/span><span class=\"mord\"><span class=\"mord\">2<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">6<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6835em;vertical-align: -0.0391em\"><\/span><span class=\"mord\">64<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&lt;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.7804em;vertical-align: -0.136em\"><\/span><span class=\"mord\">100<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.8141em\"><\/span><span class=\"mord\"><span class=\"mord\">2<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">7<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">128<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u4e8e\u662f\u4ece 128KB \u5757\u91cc\u5207&#xff0c;\u6d6a\u8d39 28KB \u5185\u90e8\u788e\u7247\u3002<\/p>\n<hr \/>\n<h3>\u4e94\u3001\u4e3a\u4ec0\u4e48\u73b0\u4ee3\u7cfb\u7edf\u6700\u7ec8\u629b\u5f03\u4e86&#034;\u8fde\u7eed\u5206\u914d&#034;<\/h3>\n<p>\u8fde\u7eed\u5206\u914d\u7ed5\u4e0d\u5f00\u5916\u90e8\u788e\u7247\u8fd9\u4e2a\u6b7b\u7ed3&#xff0c;\u7d27\u51d1\u53c8\u592a\u8d35\u3002\u4e8e\u662f\u4eba\u4eec\u6362\u4e86\u4e2a\u601d\u8def&#xff1a;\u5e72\u8106\u4e0d\u8981\u6c42\u7269\u7406\u8fde\u7eed\u2014\u2014\u628a\u7269\u7406\u5185\u5b58\u5207\u6210\u56fa\u5b9a\u5927\u5c0f\u7684\u9875\u6846&#xff08;page frame&#xff09;&#xff0c;\u8fdb\u7a0b\u7684\u6bcf\u4e00\u9875\u653e\u8fdb\u4efb\u610f\u4e00\u4e2a\u9875\u6846&#xff0c;\u9760\u4e00\u5f20\u9875\u8868\u8bb0\u5f55&#034;\u7b2c i \u9875\u5728\u54ea&#034;\u3002\u7269\u7406\u4e0a\u6563\u843d\u6ca1\u5173\u7cfb&#xff0c;\u903b\u8f91\u4e0a\u4f9d\u7136\u8fde\u7eed\u3002\u8fd9\u5c31\u662f\u5206\u9875&#xff08;\u975e\u8fde\u7eed\u5206\u914d&#xff09;&#xff0c;\u5b83\u5f7b\u5e95\u6d88\u706d\u4e86\u5916\u90e8\u788e\u7247&#xff08;\u6bcf\u9875\u90fd\u7b49\u5927&#xff0c;\u4efb\u4f55\u7a7a\u95f2\u9875\u90fd\u80fd\u585e\u8fdb\u4efb\u4f55\u9875&#xff09;\u3002<\/p>\n<p>\u6240\u4ee5\u4f60\u770b&#xff0c;\u4ece\u8fde\u7eed\u5206\u914d\u5230\u5206\u9875&#xff0c;\u672c\u8d28\u4e0a\u662f\u4e00\u6b21&#034;\u7528\u9875\u8868&#xff08;\u989d\u5916\u5f00\u9500&#xff09;\u6362\u788e\u7247&#xff08;\u5185\u5b58\u6d6a\u8d39&#xff09;&#034;\u7684\u53d6\u820d\u3002\u7406\u89e3\u4e86\u8fde\u7eed\u5206\u914d\u7684\u788e\u7247\u4e4b\u75db&#xff0c;\u4f60\u5c31\u61c2\u4e86\u5206\u9875\u4e3a\u4ec0\u4e48\u957f\u6210\u90a3\u6837\u3002<\/p>\n<hr \/>\n<h3>\u516d\u3001408 \u600e\u4e48\u8003&#xff0c;\u51e0\u4e2a\u9ad8\u9891\u5751<\/h3>\n<li>\u5185\u90e8\u788e\u7247 vs \u5916\u90e8\u788e\u7247&#xff1a;\u9009\u62e9\u9898\u6700\u7231\u8ba9&#034;\u7ed9\u51fa\u4e00\u4e2a\u5206\u914d\u5e8f\u5217&#xff0c;\u95ee\u4ea7\u751f\u4e86\u54ea\u79cd\u788e\u7247&#034;\u3002\u8bb0\u4f4f\u53e3\u8bc0\u2014\u2014&#034;\u5206\u5757\u91cc&#034;\u662f\u5185\u90e8&#xff0c;&#034;\u5757\u4e4b\u95f4&#034;\u662f\u5916\u90e8\u3002<\/li>\n<li>\u6700\u4f73\u9002\u5e94\u4ea7\u751f\u6700\u591a\u5916\u90e8\u788e\u7247&#xff1a;\u8fd9\u662f\u53cd\u76f4\u89c9\u7684\u9ad8\u9891\u8003\u70b9&#xff0c;\u522b\u80cc\u53cd\u4e86\u3002<\/li>\n<li>\u9996\u6b21\u9002\u5e94\u5e73\u5747\u6700\u5feb\u3001\u901a\u5e38\u6700\u4f18&#xff1a;\u56e0\u4e3a\u5b83\u9ad8\u5730\u5740\u7559\u5927\u5757&#xff0c;\u4e14\u4e0d\u7528\u904d\u5386\u5168\u8868\u3002<\/li>\n<li>\u7d27\u51d1\u9700\u8981\u52a8\u6001\u91cd\u5b9a\u4f4d\u652f\u6301&#xff0c;\u4e14 I\/O \u4e2d\u7684\u8fdb\u7a0b\u4e0d\u80fd\u79fb\u52a8\u3002<\/li>\n<li>\u4f19\u4f34\u7cfb\u7edf\u6309 2 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