{"id":7959,"date":"2024-06-28T18:01:01","date_gmt":"2024-06-28T10:01:01","guid":{"rendered":""},"modified":"2024-06-28T18:01:01","modified_gmt":"2024-06-28T10:01:01","slug":"\u65e0\u6cd5\u5c06\u4e0b\u5217\u8bbe\u5907\u653e\u7f6e\u5728\u6620\u5c04\u4e2d_\u8f6f\u4ef6\u8981\u6c42\u6253\u5f00\u5b58\u50a8\u6743\u9650","status":"publish","type":"post","link":"https:\/\/mushiming.com\/7959.html","title":{"rendered":"\u65e0\u6cd5\u5c06\u4e0b\u5217\u8bbe\u5907\u653e\u7f6e\u5728\u6620\u5c04\u4e2d_\u8f6f\u4ef6\u8981\u6c42\u6253\u5f00\u5b58\u50a8\u6743\u9650"},"content":{"rendered":"
\n
\n \"\u65e0\u6cd5\u5c06\u4e0b\u5217\u8bbe\u5907\u653e\u7f6e\u5728\u6620\u5c04\u4e2d_\u8f6f\u4ef6\u8981\u6c42\u6253\u5f00\u5b58\u50a8\u6743\u9650\n <\/div>\n

\u5199\u5728\u524d\u9762\uff1a\u8fd9\u662f\u672c\u4eba\u521d\u5165\u7814\u7a76\u65b9\u6cd5\u65f6\u505a\u7684\u7b14\u8bb0\u4f5c\u4e3a\u5b66\u4e60\u7684\u8f93\u51fa\uff0c\u5176\u4e2d\u53ef\u80fd\u5b58\u5728\u4e00\u4e9b\u8ba4\u77e5\u4e0a\u7684\u9519\u8bef\u3002\u82e5\u60a8\u6709\u81ea\u5df1\u7684\u89c1\u89e3\uff0c\u5e0c\u671b\u4f60\u53ef\u4ee5\u5728\u672c\u6587\u7ed3\u5c3e\u7ed9\u6211\u7559\u8a00\u6216\u76f4\u63a5\u90ae\u4ef6\u8054\u7cfb\u6211\uff0c\u4e0e\u6211\u8ba8\u8bba\u3002<\/i><\/p>\n

\u8c22\u8c22\uff01<\/i><\/p>\n

email\uff1azhaos@nbjl.nankai.edu.cn<\/i><\/p>\n

\u4e00. \u5185\u5b58\u6620\u5c04(Memory-mapped)<\/h3>\n

\u5185\u5b58\u6620\u5c04\uff08mmap\uff09<\/b>\u662f\u4e00\u79cd\u5185\u5b58\u6620\u5c04\u6587\u4ef6\u7684\u65b9\u6cd5\uff0c\u5373\u5c06\u4e00\u4e2a\u6587\u4ef6\u6216\u8005\u5176\u4ed6\u5bf9\u8c61\u6620\u5c04\u5230\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\uff0c\u5b9e\u73b0\u6587\u4ef6\u78c1\u76d8\u5730\u5740\u548c\u5e94\u7528\u7a0b\u5e8f\u8fdb\u7a0b\u865a\u62df\u5730\u5740\u7a7a\u95f4\u4e2d\u4e00\u6bb5\u865a\u62df\u5730\u5740\u7684\u4e00\u4e00\u6620\u5c04\u5173\u7cfb\u3002\u5b9e\u73b0\u8fd9\u6837\u7684\u6620\u5c04\u5173\u7cfb\u540e\uff0c\u8fdb\u7a0b\u5c31\u53ef\u4ee5\u91c7\u7528\u6307\u9488\u7684\u65b9\u5f0f\u8bfb\u5199\u64cd\u4f5c\u8fd9\u4e00\u6bb5\u5185\u5b58\uff0c\u800c\u7cfb\u7edf\u4f1a\u81ea\u52a8\u56de\u5199\u85cf\u9875\u9762\u5230\u5bf9\u5e94\u7684\u6587\u4ef6\u78c1\u76d8\u4e0a\u3002\u5e94\u7528\u7a0b\u5e8f\u5904\u7406\u6620\u5c04\u90e8\u5206\u5982\u540c\u8bbf\u95ee\u4e3b\u5b58\u3002<\/p>\n<\/p>\n

\n \"\u65e0\u6cd5\u5c06\u4e0b\u5217\u8bbe\u5907\u653e\u7f6e\u5728\u6620\u5c04\u4e2d_\u8f6f\u4ef6\u8981\u6c42\u6253\u5f00\u5b58\u50a8\u6743\u9650\n <\/div>
\n \u56fe1. \u5185\u5b58\u6620\u5c04\u6587\u4ef6(\u56fe\u7247\u6765\u6e90https:\/\/www.cnblogs.com\/huxiao-tee\/p\/4660352.html)
\n <\/figcaption>

\u4e8c. mmap\u5185\u5b58\u6620\u5c04\u539f\u7406<\/h3>\n

\uff081\uff09\u7ebf\u7a0b\u542f\u52a8\u6620\u5c04\u8fc7\u7a0b\uff0c\u5e76\u5728\u865a\u62df\u5730\u5740\u7a7a\u95f4\u4e2d\u4e3a\u6620\u5c04\u521b\u5efa\u865a\u62df\u6620\u5c04\u533a\u57df\u3002<\/p>\n

\u5148\u5728\u7528\u6237\u7a7a\u95f4\u8c03\u7528\u5e93\u51fd\u6570mmap\uff0c\u5e76\u5728\u8fdb\u7a0b\u5f53\u524d\u8fdb\u7a0b\u7684\u865a\u62df\u5730\u5740\u7a7a\u95f4\u4e2d\uff0c\u5bfb\u627e\u4e00\u6bb5\u7a7a\u95f2\u7684\u6ee1\u8db3\u8981\u6c42\u7684\u8fde\u7eed\u865a\u62df\u5730\u5740\u4f5c\u4e3a\u5185\u5b58\u865a\u62df\u6620\u5c04\u533a\u57df\uff0c\u5bf9\u6b64\u533a\u57df\u521d\u59cb\u5316\u5e76\u63d2\u5165\u8fdb\u7a0b\u7684\u865a\u62df\u5730\u5740\u533a\u57df\u94fe\u8868\u6216\u6811\u4e2d\u3002<\/p>\n

\uff082\uff09\u7cfb\u7edf\u5728\u5185\u6838\u7a7a\u95f4\u8c03\u7528\u5185\u6838\u51fd\u6570mmap\uff0c\u5b9e\u73b0\u6587\u4ef6\u7269\u7406\u5730\u5740\u548c\u8fdb\u7a0b\u865a\u62df\u5730\u5740\u4e4b\u95f4\u7684\u4e00\u4e00\u6620\u5c04\u5173\u7cfb\u3002<\/p>\n

\uff083\uff09\u8fdb\u7a0b\u53d1\u8d77\u5806\u8fd9\u7247\u6620\u5c04\u7a7a\u95f4\u7684\u8bbf\u95ee<\/p>\n

\u8fdb\u7a0b\u8bfb\u5199\u64cd\u4f5c\u8bbf\u95ee\u865a\u62df\u5730\u5740\uff0c\u67e5\u8be2\u9875\u8868\uff0c\u53d1\u73b0\u8fd9\u4e00\u6bb5\u5730\u5740\u5e76\u4e0d\u5728\u5185\u5b58\u7684\u7269\u7406\u9875\u9762\u4e0a\uff0c\u56e0\u4e3a\u867d\u7136\u5efa\u7acb\u4e86\u6620\u5c04\u5173\u7cfb\uff0c\u4f46\u662f\u8fd8\u6ca1\u6709\u5c06\u6587\u4ef6\u4ece\u78c1\u76d8\u79fb\u5230\u5185\u5b58\u4e2d\u3002\u7531\u6b64\u53d1\u751f\u7f3a\u9875\u4e2d\u65ad\uff0c\u5185\u6838\u8bf7\u6c42\u4ece\u78c1\u76d8\u8c03\u5165\u9875\u9762\u3002\u8c03\u9875\u8fc7\u7a0b\u5148\u5728\u4ea4\u6362\u7f13\u5b58\u7a7a\u95f4\uff08swap cache\uff09\u4e2d\u67e5\u627e\uff0c\u82e5\u6ca1\u6709\u5219\u901a\u8fc7nopage\u51fd\u6570\u628a\u7f3a\u5931\u9875\u4ece\u78c1\u76d8\u8c03\u5165\u5185\u5b58\u3002\u4e4b\u540e\u8fdb\u7a0b\u4f1a\u5bf9\u5176\u505a\u8bfb\u5199\u64cd\u4f5c\uff0c\u82e5\u5199\u64cd\u4f5c\u6539\u53d8\u4e86\u9875\u9762\u5185\u5bb9\uff0c\u4e00\u6bb5\u65f6\u95f4\u540e\u7cfb\u7edf\u4f1a\u81ea\u52a8\u56de\u5199\u810f\u9875\u9762\u5230\u78c1\u76d8\u4e2d\u3002(\u4fee\u6539\u8fc7\u7684\u810f\u9875\u9762\u4e0d\u4f1a\u7acb\u5373\u66f4\u65b0\u5230\u6587\u4ef6\u4e2d\uff0c\u53ef\u4ee5\u8c03\u7528msync\u6765\u5f3a\u5236\u540c\u6b65\uff0c\u5199\u5165\u6587\u4ef6)<\/p>\n

\u4e09. mmap\u548c\u5206\u9875\u6587\u4ef6\u64cd\u4f5c\u7684\u533a\u522b<\/h3>\n

\u533a\u522b\u5728\u4e8e\u5206\u9875\u6587\u4ef6\u64cd\u4f5c\u5728\u8fdb\u7a0b\u8bbf\u5b58\u65f6\u662f\u9700\u8981\u5148\u67e5\u8be2\u9875\u9762\u7f13\u5b58(page cache)<\/b>\u7684\uff0c\u82e5\u53d1\u751f\u7f3a\u9875\u4e2d\u65ad\uff0c\u9700\u8981\u901a\u8fc7inode\u5b9a\u4f4d\u6587\u4ef6\u78c1\u76d8\u5730\u5740\uff0c\u5148\u628a\u7f3a\u5931\u6587\u4ef6\u590d\u5236\u5230page cache\uff0c\u518d\u4ecepage cache\u590d\u5236\u5230\u5185\u5b58\u4e2d\uff0c\u624d\u80fd\u8fdb\u884c\u8bbf\u95ee\u3002\u8fd9\u6837\u8bbf\u5b58\u9700\u8981\u7ecf\u8fc7\u4e24\u6b21\u6587\u4ef6\u590d\u5236\uff0c\u5199\u64cd\u4f5c\u4e5f\u662f\u4e00\u6837\u3002\u603b\u7ed3\u6765\u8bf4\uff0c\u5e38\u89c4\u6587\u4ef6\u64cd\u4f5c\u4e3a\u4e86\u63d0\u9ad8\u8bfb\u5199\u6548\u7387\u548c\u4fdd\u62a4\u78c1\u76d8\uff0c\u4f7f\u7528\u4e86\u9875\u7f13\u5b58\u673a\u5236\u3002\u8fd9\u6837\u9020\u6210\u8bfb\u6587\u4ef6\u65f6\u9700\u8981\u5148\u5c06\u6587\u4ef6\u9875\u4ece\u78c1\u76d8\u62f7\u8d1d\u5230\u9875\u7f13\u5b58\u4e2d\uff0c\u7531\u4e8e\u9875\u7f13\u5b58\u5904\u5728\u5185\u6838\u7a7a\u95f4\uff0c\u4e0d\u80fd\u88ab\u7528\u6237\u8fdb\u7a0b\u76f4\u63a5\u5bfb\u5740\uff0c\u6240\u4ee5\u8fd8\u9700\u8981\u5c06\u9875\u7f13\u5b58\u4e2d\u6570\u636e\u9875\u518d\u6b21\u62f7\u8d1d\u5230\u5185\u5b58\u5bf9\u5e94\u7684\u7528\u6237\u7a7a\u95f4\u4e2d\u3002\u4f46mmap\u7684\u4f18\u52bf\u5728\u4e8e\uff0c\u628a\u78c1\u76d8\u6587\u4ef6\u4e0e\u8fdb\u7a0b\u865a\u62df\u5730\u5740\u505a\u4e86\u6620\u5c04\uff0c\u8fd9\u6837\u53ef\u4ee5\u8df3\u8fc7page cache\uff0c\u53ea\u4f7f\u7528\u4e00\u6b21\u6570\u636e\u62f7\u8d1d\u3002<\/b><\/p>\n

\u53e6\u5916\u6211\u8fd8\u60f3\u7b80\u5355\u8c08\u4e00\u4e0b\u5206\u9875\u6587\u4ef6\u64cd\u4f5c\uff1a<\/p>\n

\u5206\u9875(Paging)<\/b> \uff1a\u4e3b\u5b58\u53ef\u4ee5\u4f7f\u7528\u4e00\u90e8\u5206\u78c1\u76d8\u7a7a\u95f4\uff0c\u8fd9\u6837\u770b\u4e0a\u53bb\u4e3b\u5b58\u7684\u7a7a\u95f4\u66f4\u5927\u4e86\u3002\u6587\u4ef6\u7cfb\u7edf\u628a\u78c1\u76d8\u5206\u4e3a\u56fa\u5b9a\u5927\u5c0f\u7684\u9875(Page)\u3002\u5f53\u4e0d\u9700\u8981\u65f6\uff0c\u5c06\u5206\u9875\u7531\u4e3b\u5b58\uff08\u901a\u5e38\u662f\u5185\u5b58\uff09\u79fb\u5230\u8f85\u52a9\u5b58\u50a8\u5668\uff1b\u5f53\u9700\u8981\u65f6\uff0c\u518d\u5c06\u6570\u636e\u53d6\u56de\uff0c\u52a0\u8f7d\u4e3b\u5b58\u4e2d\u3002<\/p>\n

\u5206\u9875\u6587\u4ef6\u6280\u672f\u80fd\u6709\u52a9\u201c\u5927\u5927\u5730\u201d\u964d\u4f4e\u6574\u4f53\u53ca\u989d\u5916\u975e\u5fc5\u8981\u7684 I\/O \u6b21\u6570\uff0c\u63d0\u9ad8\u7cfb\u7edf\u6574\u4f53\u8fd0\u4f5c\u6027\u80fd\u3002\u4f46\u82e5\u8fd0\u884c\u6240\u9700\u7269\u7406\u5185\u5b58\u8fc7\u5927\uff0c\u5185\u5b58\u9700\u8981\u9891\u7e41\u7684\u8c03\u5165\u8c03\u51fa\uff0c\u9875\u9762\u4e0d\u505c\u7684\u5199\u5165\u91ca\u653e\u8bfb\u53d6\uff0c\u56de\u6781\u5927\u5f71\u54cd\u6027\u80fd\u3002\u8fd9\u88ab\u79f0\u4e3a\u7cfb\u7edf\u98a0\u7c38\u3002<\/p>\n

\u53c2\u8003\u6587\u732e\uff1a<\/p>\n

[1] \u8ba4\u771f\u5206\u6790mmap\uff1a\u662f\u4ec0\u4e48 \u4e3a\u4ec0\u4e48 \u600e\u4e48\u7528<\/p>\n

[2] \u5185\u5b58\u6620\u5c04\u6587\u4ef6<\/p>\n

[3] \u5206\u9875<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"\u65e0\u6cd5\u5c06\u4e0b\u5217\u8bbe\u5907\u653e\u7f6e\u5728\u6620\u5c04\u4e2d_\u8f6f\u4ef6\u8981\u6c42\u6253\u5f00\u5b58\u50a8\u6743\u9650\u5199\u5728\u524d\u9762\uff1a\u8fd9\u662f\u672c\u4eba\u521d\u5165\u7814\u7a76\u65b9\u6cd5\u65f6\u505a\u7684\u7b14\u8bb0\u4f5c\u4e3a\u5b66\u4e60\u7684\u8f93\u51fa\uff0c\u5176\u4e2d\u53ef\u80fd\u5b58\u5728\u4e00...","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"_links":{"self":[{"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/posts\/7959"}],"collection":[{"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/comments?post=7959"}],"version-history":[{"count":0,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/posts\/7959\/revisions"}],"wp:attachment":[{"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/media?parent=7959"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/categories?post=7959"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/tags?post=7959"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}