{"id":167144,"date":"2020-10-09T03:43:53","date_gmt":"2020-10-08T19:43:53","guid":{"rendered":"http:\/\/4563.org\/?p=167144"},"modified":"2020-10-09T03:43:53","modified_gmt":"2020-10-08T19:43:53","slug":"%e4%b8%a4%e4%b8%aa%e8%bf%9b%e7%a8%8b%e6%93%8d%e4%bd%9c%e5%90%8c%e4%b8%80%e4%b8%aa%e6%96%87%e4%bb%b6%ef%bc%8c%e4%b8%80%e4%b8%aa%e5%9c%a8%e5%b0%be%e9%83%a8%e8%bf%bd%e5%8a%a0%e5%86%99%ef%bc%8c%e4%b8%80","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=167144","title":{"rendered":"\u4e24\u4e2a\u8fdb\u7a0b\u64cd\u4f5c\u540c\u4e00\u4e2a\u6587\u4ef6\uff0c\u4e00\u4e2a\u5728\u5c3e\u90e8\u8ffd\u52a0\u5199\uff0c\u4e00\u4e2a\u4ece\u5934\u5f00\u59cb\u8bfb\uff0c\u5bf9\u78c1\u76d8\u6709\u4ec0\u4e48\u5f71\u54cd\u5462"},"content":{"rendered":"
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\u4e24\u4e2a\u8fdb\u7a0b\u64cd\u4f5c\u540c\u4e00\u4e2a\u6587\u4ef6\uff0c\u4e00\u4e2a\u5728\u5c3e\u90e8\u8ffd\u52a0\u5199\uff0c\u4e00\u4e2a\u4ece\u5934\u5f00\u59cb\u8bfb\uff0c\u5bf9\u78c1\u76d8\u6709\u4ec0\u4e48\u5f71\u54cd\u5462 <\/h1>\n

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\u8cc7\u6df1\u5927\u4f6c : kakaxi9394 <\/span> <\/i> 6<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
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\u78c1\u76d8\u5934\u662f\u4e0d\u662f\u4f1a\u4e00\u4f1a\u513f seek \u5230\u6587\u4ef6\u5934\u90e8\uff0c\u4e00\u4f1a\u513f seek \u5230\u6587\u4ef6\u5c3e\u90e8\uff1f<\/p>\n

\u6700\u8fd1\u5728\u770b kafka \u7684\u5b58\u50a8\u8bbe\u8ba1\uff0c\u60f3\u5230 broker \u4e00\u822c\u8ffd\u52a0\u65b0\u6d88\u606f\u5230\u65e5\u5fd7\u6587\u4ef6\uff0c\u4e00\u8fb9\u8bfb\u65e5\u5fd7\u6587\u4ef6\u7ed9 consumer \u53d1\u6d88\u606f\u3002\u5982\u679c\u8bfb\u5199\u8fdb\u5ea6\u6709\u5f88\u5927\u5dee\u522b\uff0c\u78c1\u76d8 seek \u7684\u5f00\u9500\u662f\u4e0d\u662f\u4f1a\u53d8\u5927\uff1f<\/p>\n

\u5373\u4f7f linux \u5185\u6838\u6709 page cache\uff0c\u662f\u4e0d\u662f\u4e5f\u4f1a\u51fa\u73b0\u8fd9\u4e2a\u95ee\u9898\uff1f<\/p>\n<\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (11<\/span>) <\/div>\n
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  • \n
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    \u8cc7\u6df1\u5927\u4f6c : zhusngqz <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u540c\u65f6\u7684\u8bdd\u5e94\u8be5\u662f\u4e00\u4e2a\u8fdb\u7a0b\u5931\u8d25\uff0c\u6216\u8005\u963b\u585e\u5427\uff01\uff01\uff01 \u6211\u662f\u600e\u4e48\u731c\u7684 <\/div>\n<\/p><\/div>\n<\/li>\n
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    \u8cc7\u6df1\u5927\u4f6c : luckyrayyy <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u54c8\u54c8\uff0c\u5f88\u6709\u610f\u601d\u7684\u95ee\u9898\uff0c\u76f4\u89c9\u4e0a\u611f\u89c9\u5e94\u8be5\u6709\u4e2a cache \u907f\u514d\u9891\u7e41\u5207\u6362\u5427\u3002\u7b49\u4e2a\u5927\u4f6c\u7684\u56de\u7b54\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
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    \u8cc7\u6df1\u5927\u4f6c : zhgg0 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e0d\u4f1a\uff0c\u5e94\u7528\u5c42\u8c03\u7528\u4e86\u5199\u5165\uff0c\u64cd\u4f5c\u7cfb\u7edf\u5e76\u4e0d\u5c11\u9a6c\u4e0a\u5c31\u5199\u78c1\u76d8\uff0c\u6709 pagecache \u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : bleoo <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4f60\u5fd8\u4e86 system-file-cache \u8fd9\u5c42 <\/div>\n<\/p><\/div>\n<\/li>\n
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    \u8cc7\u6df1\u5927\u4f6c : nekoyaki <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5728\u770b kafka \u7684\u8bbe\u8ba1\u8fd8\u80fd\u95ee\u51fa\u8fd9\u79cd\u8fd9\u4e2a\u95ee\u9898\u8bf4\u660e\u4f60\u6ca1\u770b\u61c2\uff0c\u56de\u53bb\u91cd\u770b <\/div>\n<\/p><\/div>\n<\/li>\n
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    \u8cc7\u6df1\u5927\u4f6c : sujin190 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u78c1\u76d8\u5934\u662f\u4e0d\u662f\u4f1a\u4e00\u4f1a\u513f seek \u5230\u6587\u4ef6\u5934\u90e8\uff1f\uff1f\u8fd9\u662f\u4e2a\u5565\u64cd\u4f5c\uff01 seek \u53ea\u662f\u5207\u6362\u4e86\u6587\u4ef6\u63cf\u8ff0\u7b26\u5185\u8bb0\u5f55\u7684\u6587\u4ef6\u5f53\u524d\u8bfb\u5199\u6587\u4ef6\u4f4d\u7f6e\u7f62\u4e86\uff0c\u548c\u78c1\u5934\u4e5f\u6ca1\u5565\u5173\u7cfb\u5427\uff0c\u66f4\u4e0d\u8981\u8bf4\u4e24\u4e2a\u8fdb\u7a0b\u6587\u4ef6\u63cf\u8ff0\u7b26\u4fe1\u606f\u90fd\u662f\u72ec\u7acb\u7684\uff0c\u6709\u5565\u5173\u7cfb\uff0c\u5b9e\u9645\u8bfb\u5199\u89e6\u53d1\u78c1\u5934\u5bfb\u5230\u7684\u8bdd\uff0c\u78c1\u5934\u59cb\u7ec8\u5728\u9ad8\u901f\u65cb\u8f6c\u5728\u78c1\u76d8\u4e0a\uff0c\u4f60\u4e0d\u64cd\u4f5c\u4e5f\u6709\u5176\u4ed6\u8fdb\u7a0b\u4f1a\u89e6\u53d1\u78c1\u5934\u5bfb\u9053\u7684\u5427\uff0c\u800c\u4e14 kafka \u8fd9\u79cd\u8fde\u7eed\u8bfb\u5199\u7684\u65b9\u5f0f\u6765\u8bf4\uff0c\u6587\u4ef6\u5934\u548c\u6587\u4ef6\u5c3e\u5927\u6982\u7387\u5728\u540c\u5df2\u78c1\u9053\u4e0a\uff0c\u6d88\u8017\u5f88\u5c0f\u7684\u5427\uff0c\u66f4\u4e0d\u8981\u8bf4\u64cd\u4f5c\u7cfb\u7edf\u8fd8\u6709\u6587\u4ef6\u7f13\u5b58 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : kakaxi9394 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @zhusngqz \u4e0d\u81f3\u4e8e <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : kakaxi9394 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6211\u77e5\u9053\u5185\u6838\u6587\u4ef6\u5bf9\u8c61\u6709 read\/write buffer\uff0c\u6240\u4ee5\u8bfb\u5199\u80af\u5b9a\u662f\u5148\u7ecf\u8fc7\u5185\u6838 buffer\uff0c\u518d\u5230\u78c1\u76d8\u6587\u4ef6\u3002
    \u4e5f\u77e5\u9053 kafka \u662f\u7ebf\u6027\u8bfb\u5199\uff0c\u5229\u7528\u4e24\u79cd buffer \u5df2\u7ecf\u6781\u5927\u7a0b\u5ea6\u4e0a\u89e3\u51b3\u4e86\u95ee\u9898\u3002<\/p>\n

    \u6211\u8fd9\u91cc\u5c31\u53ea\u662f\u597d\u5947\uff0c\u662f\u4e0d\u662f\u6709\u6781\u7aef\u60c5\u51b5\uff1a \u4e00\u4e2a\u65e5\u5fd7\u6587\u4ef6\u540c\u65f6\u8bfb\u5199\uff0c\u53c8\u6070\u597d\u89e6\u53d1\u4e86\u5185\u6838 buffer \u548c\u78c1\u76d8\u6587\u4ef6\u7684\u540c\u6b65\uff0c\u5c31\u4f1a\u51fa\u73b0\u201c\u4e00\u4f1a\u513f seek \u5230\u6587\u4ef6\u5934\u90e8\uff0c\u4e00\u4f1a\u513f seek \u5230\u6587\u4ef6\u5c3e\u90e8\u201d\u7684\u60c5\u51b5\u3002<\/p>\n

    \u611f\u89c9\u662f\u6709\u53ef\u80fd\u7684\u3002\u6211\u81ea\u5df1\u94bb\u725b\u89d2\u5c16\u7f62\u4e86\uff0c\u7eaf\u7cb9\u597d\u5947 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
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    \u8cc7\u6df1\u5927\u4f6c : gotonull <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    2 \u4e2a\u8fdb\u7a0b\u540c\u65f6\u5bf9\u4e00\u4e2a\u6587\u4ef6\u64cd\u4f5c\uff0c\u4e00\u4e2a\u62ff\u5230\u5199\u9501\u4e86\uff0c\u53e6\u4e00\u4e2a\u5e94\u8be5\u4e0d\u80fd\u8bfb\u4e86\u5427 <\/div>\n<\/p><\/div>\n<\/li>\n
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    \u8cc7\u6df1\u5927\u4f6c : ryd994 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @kakaxi9394 Linux \u9ed8\u8ba4\u662f CFQ \u6216\u8005 deadline \u78c1\u76d8\u8c03\u5ea6\u5668\u3002\u8bfb\u6bd4\u5199\u4f18\u5148\u7ea7\u9ad8\u3002\u6240\u4ee5\u4f1a\u4f18\u5148\u6267\u884c\u8bfb\u64cd\u4f5c\u3002
    \u5199\u4f1a\u5ef6\u8fdf\uff0c\u7136\u540e\u591a\u4e2a\u8fde\u7eed\u7684\u64cd\u4f5c\u4f1a\u88ab\u5408\u5e76\u3002
    \u8bfb\u5b9e\u9645\u4e0a\u4f1a\u6709 readahead \u673a\u5236\u53c2\u4e0e\u3002\u9884\u8bfb\u4e0b\u4e00\u90e8\u5206\u5230\u7f13\u5b58\u3002\u6240\u4ee5\u53ef\u4ee5\u8bf4\u8bfb\u64cd\u4f5c\u4e5f\u88ab\u5408\u5e76\u4e86\u3002<\/p>\n

    \u521a\u5199\u5165\u7684\u6587\u4ef6\u5185\u5bb9\u5c31\u5728 cache \u91cc\uff0c\u4e0d\u9700\u8981\u8bfb\u3002\u786c\u8981\u505a\u6210 write trough cache \u7684\u8bdd\uff0c\u53ef\u80fd\u4f1a\u6765\u56de seek\uff0c\u4f46\u4e0d\u4f1a\u975e\u5e38\u9891\u7e41\u3002\u786c\u8981\u7981\u7528 cache \u548c\u8c03\u5ea6\u5668\u7684\u8bdd\u624d\u4f1a\u6765\u56de seek \uff08\u4f46\u662f\u786c\u76d8\u672c\u8eab\u8fd8\u6709 buffer \uff09 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
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    \u8cc7\u6df1\u5927\u4f6c : jones2000 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u7528 SSD \u4e0d\u5b58\u5728\u4ec0\u4e48\u78c1\u5934\u95ee\u9898\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"

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