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data-src=\"https:\/\/mmbiz.qpic.cn\/mmbiz_png\/TufFCFqd0g09VVYiaFdQhhFNUxmCDM1llHreOiaW62aGQu55oRu1gf7pia1peEF1aZMcibC2XHIl2xWww1c3AqVgog\/640?wx_fmt=png\" data-type=\"png\" data-w=\"284\" \/><\/p>\n<p>\u56fe4\u00a0\u91ca\u653e\u5b57\u7b26\u4e32\u4e4b\u540e\u7684\u5185\u5b58\u56fe<\/p>\n<p>\u8fd9\u6837\u8fd93\u5757\u5185\u5b58\u53c8\u53ef\u4ee5\u91cd\u590d\u5229\u7528\u4e86\u3002\u4f46\u662f\u8fd9\u4e9b\u5185\u5b58\u592a\u5c0f\u4e86\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u4e4b\u540e\u53ef\u4ee5\u66f4\u597d\u5730\u5229\u7528\uff0c\u6211\u4eec\u9700\u8981\u5c06\u5176\u5408\u5e76\u8d77\u6765\uff08\u5408\u5e76\u6210\u4e00\u5757\u5185\u5b58\uff09\uff0c\u8fd9\u6837\u518d\u6b21\u5206\u914d\u5185\u5b58\u65f6\uff0c\u53ea\u8981\u7528\u6237\u9700\u8981\u7684\u5185\u5b58\u4e0d\u8d85\u8fc76\u5b57\u8282\uff0c\u53ea\u9700\u8981\u4ece\u4e2d\u5212\u51fa\u4e00\u5757\u5206\u7ed9\u7528\u6237\u5373\u53ef\u3002\u5408\u5e76\u4e4b\u540e\u7684\u5185\u5b58\u56fe\u5982\u56fe5\u6240\u793a\u3002<\/p>\n<p><img decoding=\"async\" class=\"img_loading\" src=\"data:image\/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQImWNgYGBgAAAABQABh6FO1AAAAABJRU5ErkJggg==\" data-ratio=\"1.0318021201413428\" data-s=\"300,640\" data-src=\"https:\/\/mmbiz.qpic.cn\/mmbiz_png\/TufFCFqd0g09VVYiaFdQhhFNUxmCDM1llCvwpfbgDTkkiao9UxBmVEuby6gROn6UU8e7pTBAH6hOEdGVuEmpO3SQ\/640?wx_fmt=png\" data-type=\"png\" data-w=\"283\" \/><\/p>\n<p>\u56fe5\u00a0\u5408\u5e76\u4e4b\u540e\u7684\u5185\u5b58\u56fe<\/p>\n<p>\u4f46\u8fd9\u662f\u4e00\u79cd\u975e\u5e38\u7406\u60f3\u7684\u60c5\u51b5\uff0c\u800c\u4e14\u662f\u4e00\u79cd\u6781\u7aef\u6700\u4f18\u60c5\u51b5\u3002\u8ba9\u6211\u4eec\u6765\u770b\u53e6\u4e00\u79cd\u6781\u7aef\u6700\u574f\u7684\u60c5\u51b5\uff0c\u5047\u8bbe\u6211\u4eec\u5206\u914d\u5185\u5b58\u5982\u56fe6\u6240\u793a\u3002<\/p>\n<p><img decoding=\"async\" class=\"img_loading\" src=\"data:image\/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQImWNgYGBgAAAABQABh6FO1AAAAABJRU5ErkJggg==\" data-ratio=\"1.064748201438849\" data-s=\"300,640\" data-src=\"https:\/\/mmbiz.qpic.cn\/mmbiz_png\/TufFCFqd0g09VVYiaFdQhhFNUxmCDM1ll7sOxD3fpdrY1GicvicPgAkfPic8QgUVE1HANzS7GIkITypa7S4ibovL5tg\/640?wx_fmt=png\" data-type=\"png\" data-w=\"278\" \/><\/p>\n<p>\u56fe6\u00a0\u5185\u5b58\u56fe<\/p>\n<p>\u73b0\u5728\u770b\u8d77\u6765\u662f\u6b63\u5e38\u7684\u3002\u4f46\u662f\u5982\u679c\u6211\u4eec\u4e0d\u9700\u8981\u90a3\u51e0\u4e2a2\u5b57\u8282\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u5185\u5b58\u5982\u56fe7\u6240\u793a\u3002<\/p>\n<p><img decoding=\"async\" class=\"img_loading\" src=\"data:image\/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQImWNgYGBgAAAABQABh6FO1AAAAABJRU5ErkJggg==\" data-ratio=\"1.0277777777777777\" data-s=\"300,640\" data-src=\"https:\/\/mmbiz.qpic.cn\/mmbiz_png\/TufFCFqd0g09VVYiaFdQhhFNUxmCDM1llChQtgKSMicL5ljNRphDSTmXOlxOdicKEB4PYCTntCGmazrxPdzryUFIA\/640?wx_fmt=png\" data-type=\"png\" data-w=\"288\" \/><\/p>\n<p>\u56fe7\u00a0\u5185\u5b58\u56fe<\/p>\n<p>\u73b0\u5728\u90a3\u51e0\u4e2a2\u5b57\u8282\u7684\u7a7a\u95f4\u662f\u88ab\u8fd8\u7ed9\u5185\u5b58\u7ba1\u7406\u5668\u4e86\uff0c\u4f46\u662f\u5185\u5b58\u7ba1\u7406\u5668\u6ca1\u529e\u6cd5\u5bf9\u5176\u8fdb\u884c\u5408\u5e76\uff0c\u56e0\u4e3a\u8fd9\u51e0\u4e2a\u5f88\u5c0f\u7684\u7a7a\u95f4\u662f\u96f6\u788e\u5206\u5e03\u5728\u8fd9\u7247\u5185\u5b58\u4e2d\u7684\u3002\u4e00\u4e2a\u6781\u7aef\u60c5\u51b5\u662f\uff1a\u5982\u679c\u7a0b\u5e8f\u518d\u4e5f\u6ca1\u67092\u5b57\u8282\u7684\u52a8\u6001\u5185\u5b58\u53ef\u4ee5\u5206\u914d\u4e86\uff0c\u800c\u4e14\u8fd9\u51e0\u4e2a4\u5b57\u8282\u5185\u5b58\u662f\u6c38\u8fdc\u5360\u7528\u7684\uff0c\u90a3\u4e48\u8fd9\u51e0\u4e2a2\u5b57\u8282\u5185\u5b58\u53c8\u8be5\u5982\u4f55\u4f7f\u7528\u5462\uff1f<\/p>\n<p>\u5f88\u660e\u663e\uff0c\u8fd9\u51e0\u5757\u5185\u5b58\u5df2\u7ecf\u518d\u4e5f\u65e0\u6cd5\u4f7f\u7528\u4e86\uff0c\u65e2\u4e0d\u80fd\u5206\u914d\u53c8\u4e0d\u80fd\u5f52\u8fd8\u2014\u2014\u8fd9\u5c31\u662f\u6240\u8c13\u7684\u5185\u5b58\u788e\u7247\u3002\u5c0f\u89c4\u6a21\u7684\u5185\u5b58\u5206\u914d\u8d8a\u591a\uff0c\u5185\u5b58\u788e\u7247\u4e5f\u5c31\u4f1a\u8d8a\u4e25\u91cd\u3002\u800cgcc\u9ed8\u8ba4\u4f7f\u7528\u7684ptmalloc\u5206\u914d\u5668\u5bf9\u8fd9\u79cd\u5185\u5b58\u788e\u7247\u7684\u4f18\u5316\u4e0d\u662f\u975e\u5e38\u7406\u60f3\uff0c\u5bfc\u81f4\u4e86Samuel\u51fa\u73b0\u4e86\u770b\u4f3c\u662f\u201c\u5185\u5b58\u6cc4\u6f0f\u201d\u7684\u95ee\u9898\uff0c\u5b9e\u9645\u4e0a\u662f\u5185\u5b58\u788e\u7247\u95ee\u9898\u3002<\/p>\n<p>\u6b64\u5916\uff0c\u6211\u4eec\u60f3\u8c61\u53e6\u4e00\u4e2a\u573a\u666f\uff0c\u5982\u679c\u6bcf\u4e2a\u7ebf\u7a0b\u5e76\u53d1\u5206\u914d\u5806\uff0c\u7531\u4e8e\u5bf9\u4e8e\u6bcf\u4e2a\u8fdb\u7a0b\u5806\u662f\u552f\u4e00\u7684\uff0c\u56e0\u6b64\u6211\u4eec\u518d\u5206\u914d\u5185\u5b58\u65f6\u8fd8\u9700\u8981\u4e0a\u9501\uff0c\u5982\u679c\u5728\u4e00\u4e2a\u7a0b\u5e8f\u4e2d\u9700\u8981\u5728\u77ed\u65f6\u95f4\u5185\u9891\u7e41\u5730\u5206\u914d\u5c0f\u5185\u5b58\uff0c\u90a3\u4e48\u53c8\u4f1a\u51fa\u73b0\u56e0\u4e3a\u9891\u7e41\u4e0a\u9501\u800c\u5bfc\u81f4\u7684\u6027\u80fd\u635f\u8017\u3002\u8fd9\u662f\u6211\u4eec\u65e0\u6cd5\u63a5\u53d7\u7684\u3002<\/p>\n<p>\u4e8c\u3001tcmalloc<\/p>\n<p>\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e9b\u66f4\u597d\u7684\u5185\u5b58\u7ba1\u7406\u5668\u66ff\u4ee3\u9ed8\u8ba4\u7684\u5185\u5b58\u7ba1\u7406\u5668\uff0c\u5982Google\u5f00\u53d1\u7684tcmalloc\uff08Google\u7684gperftools\u7684\u4e00\u90e8\u5206\uff0c\u7f51\u5740\u4e3ahttps:\/\/github.com\/gperftools\/gperftools\uff09\u548cjemalloc\u7b49\u5185\u5b58\u7ba1\u7406\u5e93\uff0c\u8fd9\u4e9b\u5e93\u4f7f\u7528\u5f97\u975e\u5e38\u9891\u7e41\uff0c\u800c\u4e14\u4e0d\u9700\u8981\u6539\u53d8\u539f\u6709\u4ee3\u7801\uff0c\u5bf9\u4e8e\u9891\u7e41\u4f7f\u7528\u5185\u5b58\u7684\u7a0b\u5e8f\uff0c\u662f\u975e\u5e38\u503c\u5f97\u4f7f\u7528\u7684\uff0c\u4f8b\u5982\uff0cRedis\u4e3a\u4e86\u83b7\u5f97\u6700\u597d\u7684\u6027\u80fd\u5c31\u4f7f\u7528\u4e86tcmalloc\u548cjemalloc\u3002\uff08Redis\u662f\u4e00\u4e2a\u5f00\u6e90\u7684\u4f7f\u7528ANSI C\u8bed\u8a00\u7f16\u5199\u3001\u652f\u6301\u7f51\u7edc\u3001\u53ef\u57fa\u4e8e\u5185\u5b58\u4ea6\u53ef\u6301\u4e45\u5316\u7684\u65e5\u5fd7\u578b\u3001Key-Value\u6570\u636e\u5e93\uff0c\u5e76\u63d0\u4f9b\u591a\u79cd\u8bed\u8a00\u7684API\uff0c\u662f\u76ee\u524d\u6700\u6d41\u884c\u7684\u7f13\u5b58\u89e3\u51b3\u65b9\u6848\u4e4b\u4e00\u3002\uff09<\/p>\n<p>tcmalloc\u548cjemalloc\u7684\u539f\u7406\u975e\u5e38\u76f8\u4f3c\uff0c\u90fd\u662f\u5728\u94fe\u63a5\u65f6\u671f\u66ff\u4ee3\u6807\u51c6libc\u4e2d\u7684malloc\u548cfree\uff0c\u56e0\u6b64\u52a0\u8f7d\u7a0b\u5e8f\u540e\u5c31\u4f1a\u66ff\u4ee3\u539f\u6709\u7684malloc\u548cfree\u8fdb\u884c\u5de5\u4f5c\uff0c\u56e0\u6b64\u5728\u4e0d\u6539\u52a8\u4ee3\u7801\u7684\u60c5\u51b5\u4e0b\uff0c\u5c31\u53ef\u4ee5\u89e3\u51b3\u5185\u5b58\u788e\u7247\u7684\u95ee\u9898\u3002<\/p>\n<p>\u4e0b\u9762\u4ecb\u7ecd\u4e00\u4e0btcmalloc\u3002<\/p>\n<p>tcmalloc\u5c31\u662f\u4e00\u4e2a\u5185\u5b58\u5206\u914d\u5668\uff0c\u7ba1\u7406\u5806\u5185\u5b58\uff0c\u4e3b\u8981\u5f71\u54cdmalloc\u548cfree\uff0c\u7528\u4e8e\u964d\u4f4e\u9891\u7e41\u5206\u914d\u3001\u91ca\u653e\u5185\u5b58\u9020\u6210\u7684\u6027\u80fd\u635f\u8017\uff0c\u5e76\u4e14\u6709\u6548\u5730\u63a7\u5236\u5185\u5b58\u788e\u7247\u3002glibc\u4e2d\u7684\u5185\u5b58\u5206\u914d\u5668\u662fptmalloc2\uff0ctcmalloc\u53f7\u79f0\u8981\u6bd4\u5b83\u5feb\u3002\u4e00\u6b21malloc\u548cfree\u64cd\u4f5c\uff0cptmalloc\u9700\u8981300 ns\uff0c\u800ctcmalloc\u53ea\u898150 ns\u3002\u540c\u65f6tcmalloc\u4e5f\u4f18\u5316\u4e86\u5c0f\u5bf9\u8c61\u7684\u5b58\u50a8\uff0c\u9700\u8981\u66f4\u5c11\u7684\u7a7a\u95f4\u3002tcmalloc\u7279\u522b\u5bf9\u591a\u7ebf\u7a0b\u505a\u4e86\u4f18\u5316\uff0c\u5bf9\u4e8e\u5c0f\u5bf9\u8c61\u7684\u5206\u914d\u57fa\u672c\u4e0a\u4e0d\u5b58\u5728\u9501\u7ade\u4e89\uff0c\u800c\u5927\u5bf9\u8c61\u4f7f\u7528\u4e86\u7ec6\u7c92\u5ea6\u3001\u9ad8\u6548\u7684\u81ea\u65cb\u9501\uff08Spinlock\uff09\u3002\u5206\u914d\u7ed9\u7ebf\u7a0b\u7684\u672c\u5730\u7f13\u5b58\u5728\u957f\u65f6\u95f4\u7a7a\u95f2\u7684\u60c5\u51b5\u4e0b\u4f1a\u88ab\u56de\u6536\uff0c\u4f9b\u5176\u4ed6\u7ebf\u7a0b\u4f7f\u7528\uff0c\u8fd9\u6837\u63d0\u9ad8\u4e86\u5728\u591a\u7ebf\u7a0b\u60c5\u51b5\u4e0b\u7684\u5185\u5b58\u5229\u7528\u7387\uff0c\u4e0d\u4f1a\u6d6a\u8d39\u5185\u5b58\uff0c\u800c\u8fd9\u4e00\u70b9ptmalloc2\u662f\u505a\u4e0d\u5230\u7684\u3002tcmalloc\u533a\u522b\u5730\u5bf9\u5f85\u5927\u3001\u5c0f\u5bf9\u8c61\u3002\u5b83\u4e3a\u6bcf\u4e2a\u7ebf\u7a0b\u5206\u914d\u4e86\u4e00\u4e2a\u7ebf\u7a0b\u5c40\u90e8\u7684cache\uff0c\u7ebf\u7a0b\u9700\u8981\u7684\u5c0f\u5bf9\u8c61\u90fd\u662f\u5728\u5176cache\u4e2d\u5206\u914d\u7684\uff0c\u7531\u4e8e\u662fthread local\u7684\uff0c\u6240\u4ee5\u57fa\u672c\u4e0a\u662f\u65e0\u9501\u64cd\u4f5c\uff08\u5728cache\u4e0d\u591f\uff0c\u9700\u8981\u589e\u52a0\u5185\u5b58\u65f6\uff0c\u4f1a\u52a0\u9501\uff09\u3002\u540c\u65f6\uff0ctcmalloc\u7ef4\u62a4\u4e86\u8fdb\u7a0b\u7ea7\u522b\u7684cache\uff0c\u6240\u6709\u7684\u5927\u5bf9\u8c61\u90fd\u5728\u8fd9\u4e2acache\u4e2d\u5206\u914d\uff0c\u7531\u4e8e\u591a\u4e2a\u7ebf\u7a0b\u7684\u5927\u5bf9\u8c61\u7684\u5206\u914d\u90fd\u4ece\u8fd9\u4e2acache\u8fdb\u884c\uff0c\u6240\u4ee5\u5fc5\u987b\u52a0\u9501\u8bbf\u95ee\u3002\u5728\u5b9e\u9645<\/p>\n<p>\u7684\u7a0b\u5e8f\u4e2d\uff0c\u5c0f\u5bf9\u8c61\u5206\u914d\u7684\u9891\u7387\u8981\u8fdc\u8fdc\u9ad8\u4e8e\u5927\u5bf9\u8c61\uff0c\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff08\u5c0f\u5bf9\u8c61\u65e0\u9501\u5206\u914d\uff0c\u5927\u5bf9\u8c61\u52a0\u9501\u5206\u914d\uff09\u53ef\u4ee5\u63d0\u5347\u6574\u4f53\u6027\u80fd\u3002<\/p>\n<p>\u7ebf\u7a0b\u7ea7\u522bcache\u548c\u8fdb\u7a0b\u7ea7\u522bcache\u5b9e\u9645\u4e0a\u5c31\u662f\u4e00\u4e2a\u591a\u7ea7\u7684\u7a7a\u95f2\u5757\u5217\u8868\uff08Free List\uff09\u3002\u4e00\u4e2a\u7a7a\u95f2\u5757\u5217\u8868\u4ee5\u5927\u5c0f\u4e3ak B\u500d\u6570\u7684\u7a7a\u95f2\u5757\u8fdb\u884c\u5206\u914d\uff0c\u5305\u542bn\u4e2a\u94fe\u8868\uff0c\u6bcf\u4e2a\u94fe\u8868\u5b58\u653e\u5927\u5c0f\u4e3an\u00d7k B\u7684\u7a7a\u95f2\u5757\u3002\u5728tcmalloc\u4e2d\uff0c\u5c0f\u4e8e\u7b49\u4e8e32 KB\u7684\u5bf9\u8c61\u88ab\u79f0\u4e3a\u5c0f\u5bf9\u8c61\uff0c\u5927\u4e8e32 KB\u7684\u662f\u5927\u5bf9\u8c61\u3002\u5728\u5c0f\u5bf9\u8c61\u4e2d\uff0c\u5c0f\u4e8e\u7b49\u4e8e1024 B\u7684\u5bf9\u8c61\u4ee58n B\u5206\u914d\uff0c\u5927\u4e8e1025 B\uff0c\u5c0f\u4e8e\u7b49\u4e8e32 KB\u7684\u5bf9\u8c61\u4ee5128n B\u5927\u5c0f\u5206\u914d\uff0c\u4f8b\u5982\uff0c\u8981\u5206\u914d20 B\u5219\u8fd4\u56de\u7684\u7a7a\u95f2\u5757\u5927\u5c0f\u662f24 B\uff0c\u5c0f\u4e8e\u7b49\u4e8eB\u7684\uff0c\u8fd9\u6837\u5728\u5c0f\u4e8e\u7b49\u4e8e1024 B\u7684\u60c5\u51b5\u4e0b\u6700\u591a\u6d6a\u8d397 B\uff0c\u5927\u4e8e1025 B\u5219\u6d6a\u8d39127 B\u3002\u800c\u5927\u5bf9\u8c61\u662f\u4ee5\u9875\u5927\u5c0f4 KB\u8fdb\u884c\u5bf9\u9f50\u7684\uff0c\u6700\u591a\u4f1a\u6d6a\u8d394KB-1 B\u3002\u56fe8\u6240\u793a\u4e3a\u4e00\u4e2a\u7a7a\u95f2\u5757\u5217\u8868\u7684\u793a\u610f\u56fe\u3002<\/p>\n<p><img decoding=\"async\" class=\"img_loading\" src=\"data:image\/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQImWNgYGBgAAAABQABh6FO1AAAAABJRU5ErkJggg==\" data-ratio=\"0.835016835016835\" data-s=\"300,640\" data-src=\"https:\/\/mmbiz.qpic.cn\/mmbiz_png\/TufFCFqd0g09VVYiaFdQhhFNUxmCDM1llKSHialGMbCjsO5nmlp4qfguInoo21aoA2cbZWWzKEiaxaic4G0wdXS3EQ\/640?wx_fmt=png\" data-type=\"png\" data-w=\"297\" \/><\/p>\n<p>\u56fe8\u00a0\u3000tcmalloc\u7a7a\u95f2\u94fe\u8868\u793a\u610f\u56fe<\/p>\n<p>\u5b9e\u9645\u4e0a\uff0c\u4e00\u4e2a\u7a7a\u95f2\u5757\u5217\u8868\u5c31\u662f\u4e00\u4e2a\u6570\u7ec4\u7d22\u5f15\u591a\u4e2a\u94fe\u8868\uff0c\u6bcf\u4e2a\u94fe\u8868\u5b58\u653e\u76f8\u540c\u5927\u5c0f\u7684\u5757\u3002\u53ef\u4ee5\u6839\u636e\u8981\u5206\u914d\u7684\u5185\u5b58\u5927\u5c0fsize\u7b97\u51fa\u5408\u9002\u7684\u5757\u5728free list\u4e2d\u7684\u4e0b\u6807\uff0c\u7136\u540e\u627e\u5230\u5bf9\u5e94\u7684\u7a7a\u95f2\u5757\u94fe\u8868\u3002<\/p>\n<p>tcmalloc\u7684\u6570\u636e\u7ed3\u6784\u7ec4\u7ec7\u5982\u56fe9\u6240\u793a\u3002<\/p>\n<p><img decoding=\"async\" class=\"img_loading\" src=\"data:image\/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQImWNgYGBgAAAABQABh6FO1AAAAABJRU5ErkJggg==\" data-ratio=\"0.5987780040733197\" data-s=\"300,640\" data-src=\"https:\/\/mmbiz.qpic.cn\/mmbiz_png\/TufFCFqd0g09VVYiaFdQhhFNUxmCDM1ll9uZ936xld1pbxuaALJlCldsym4lRW7iaw6a6E5brlLUVuJPtKwzXIlw\/640?wx_fmt=png\" data-type=\"png\" data-w=\"491\" \/><\/p>\n<p>\u56fe9\u00a0tcmalloc\u6570\u636e\u7ec4\u7ec7<\/p>\n<p>1\uff09\u7ebf\u7a0b\u5c40\u90e8\u7a7a\u95f2\u94fe\u8868\uff1a\u7ebf\u7a0b\u672c\u5730\u7684\u7a7a\u95f2\u5757cache\uff0c\u7528\u4e8e\u5206\u914d\u5c0f\u5bf9\u8c61\u3002<\/p>\n<p>2\uff09\u5806\u7a7a\u95f2\u94fe\u8868\uff1a\u4e2d\u5fc3free list\uff0c\u5168\u5c40\u552f\u4e00\uff0c\u7528\u4e8e\u6309\u9875\u5bf9\u9f50\u5206\u914d\u5927\u5bf9\u8c61\u6216\u8005\u5c06\u8fde\u7eed\u7684\u591a\u4e2a\u9875\uff08\u88ab\u79f0\u4f5cspan\uff09\u5206\u5272\u6210\u591a\u4e2a\u5c0f\u5bf9\u8c61\u7684\u7a7a\u95f2\u5757\u5206\u914d\u7ed9thread-local free list\u3002<\/p>\n<p>3\uff09\u9875\u9762\u6570\u7ec4\uff1a\u7528\u4e8e\u63cf\u8ff0\u5f53\u524dtcmalloc\u6301\u6709\u7684\u5185\u5b58\u72b6\u6001\uff0c\u5b8c\u6210\u4ecepage number\u5230span\u7684\u6620\u5c04\u3002<\/p>\n<p>\u5c0f\u5bf9\u8c61\u7684\u5206\u914d\u8fc7\u7a0b\u5982\u4e0b\u3002<\/p>\n<p>1\uff09\u6839\u636e\u5206\u914d\u7684size\u8ba1\u7b97\u51fa\u5bf9\u5e94\u7684\u7a7a\u95f2\u5757\u5927\u5c0f\uff0c\u4ece\u800c\u786e\u5b9a\u5bf9\u5e94\u7a7a\u95f2\u5757\u94fe\u8868\uff0c\u7136\u540e\u4ecethread\u00a0local\u7684free list\u8fdb\u884c\u5206\u914d\u3002<\/p>\n<p>2\uff09\u5982\u679c\u7a7a\u95f2\u5757\u94fe\u8868\u975e\u7a7a\uff0c\u76f4\u63a5\u5c06\u5934\u7ed3\u70b9\u5bf9\u5e94\u7684\u7a7a\u95f2\u5757\u8fd4\u56de\u5e76\u4ece\u7a7a\u95f2\u5757\u94fe\u8868\u4e2d\u5c06\u5176\u5220\u9664\u3002<\/p>\n<p>3\uff09\u5982\u679c\u7a7a\u95f2\u5757\u94fe\u8868\u662f\u7a7a\u7684\uff0c\u9700\u8981\u4eceheap free list\u83b7\u53d6\u4e00\u4e2aspan\u3002\u5982\u679cheap free list\u975e\u7a7a\uff0c\u5219\u5c06span\u5207\u5206\u6210\u591a\u4e2a\u76f8\u540c\u5927\u5c0f\u7684\u7a7a\u95f2\u5757\u63d2\u5165\u7a7a\u95f2\u5757\u94fe\u8868\u4e2d\uff0c\u7136\u540e\u8fd4\u56de\u5934\u8282\u70b9\u3002<\/p>\n<p>4\uff09\u5982\u679cheap free list\u662f\u7a7a\u7684\uff0c\u5219\u8c03\u7528sbrk\u6216\u8005mmap\u8fdb\u884c\u5185\u5b58\u7684\u5206\u914d\uff0c\u4e00\u7cfb\u5217\u8fde\u7eed\u7684\u5185\u5b58\u9875\u4f5c\u4e3aspan\uff0c\u7136\u540e\u5207\u5206\u6210\u591a\u4e2a\u76f8\u540c\u5927\u5c0f\u7684\u7a7a\u95f2\u5757\u63d2\u5165\u7a7a\u95f2\u5757\u94fe\u8868\uff0c\u7136\u540e\u8fd4\u56de\u5934\u7ed3\u70b9\u3002\u5927\u5bf9\u8c61\u7684\u5206\u914d\u7b80\u5355\u5f97\u591a\uff0c\u76f4\u63a5\u4eceheap free list\u5206\u914d4n KB\u5927\u5c0f\u7684\u7a7a\u95f2\u5757\u5373\u53ef\uff0c\u5982\u679cheap free\u00a0list\u4e0d\u5b58\u5728\u8be5\u5927\u5c0f\u7684\u7a7a\u95f2\u5757\uff0c\u901a\u8fc7\u7cfb\u7edf\u8c03\u7528\u5206\u914d\u8fde\u7eed\u7684\u5185\u5b58\u9875\u3002<\/p>\n<p>tcmalloc\u8fd8\u4f1a\u5bf9thread local cache\u8fdb\u884c\u5783\u573e\u6536\u96c6\uff0c\u4ece\u800c\u907f\u514d\u5185\u5b58\u6d6a\u8d39\u3002\u6216\u8005\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e2a\u4f20\u7edf\u7684\u89e3\u51b3\u65b9\u6848\u2014\u2014\u5185\u5b58\u6c60\u3002<\/p>\n<p>\u4e09\u3001\u5185\u5b58\u6c60<\/p>\n<p>\u5185\u5b58\u6c60\u7684\u601d\u60f3\u5f88\u7b80\u5355\uff0c\u65e2\u7136\u5bf9\u4e8e\u7279\u5b9a\u7528\u9014\u901a\u7528\u5185\u5b58\u7ba1\u7406\u5668\u5df2\u7ecf\u65e0\u6cd5\u5f88\u597d\u5730\u8fd0\u4f5c\u4e86\uff0c\u90a3\u4e48\u5e72\u8106\u5c31\u6a21\u4eff\u5185\u5b58\u7ba1\u7406\u5668\uff0c\u76f4\u63a5\u5728\u7cfb\u7edf\u5206\u914d\u7684\u4e00\u5757\u5927\u5185\u5b58\u4e0a\u5efa\u7acb\u6211\u4eec\u81ea\u5df1\u7684\u5185\u5b58\u7ba1\u7406\u673a\u5236\uff0c\u5e76\u8bbe\u8ba1\u4e00\u5957\u6570\u636e\u7ed3\u6784\u4e0e\u7b97\u6cd5\u6765\u9002\u5e94\u6211\u4eec\u7279\u6b8a\u7684\u5185\u5b58\u5206\u914d\u9700\u6c42\u5373\u53ef\u3002<\/p>\n<p>\u5982\u679c\u662f\u901a\u7528\u5185\u5b58\u6c60\uff0c\u6211\u4eec\u53ef\u4ee5\u6a21\u4eff\u901a\u7528\u7684\u5185\u5b58\u7ba1\u7406\u5668\uff0c\u901a\u8fc7\u5982\u56fe10\u6240\u793a\u7684\u6570\u636e\u7ed3\u6784\u6765\u7ba1\u7406\u5185\u5b58\u7a7a\u95f4\u3002<\/p>\n<p><img decoding=\"async\" class=\"\" src=\"https:\/\/mmbiz.qpic.cn\/mmbiz_png\/TufFCFqd0g09VVYiaFdQhhFNUxmCDM1ll8VTHBTQbuMk3uXuwjicUVeLjicdXA2HfnDXmJJCxtI3rrWqUvsCEVBCQ\/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1\" data-ratio=\"0.39166666666666666\" data-s=\"300,640\" data-src=\"https:\/\/mmbiz.qpic.cn\/mmbiz_png\/TufFCFqd0g09VVYiaFdQhhFNUxmCDM1ll8VTHBTQbuMk3uXuwjicUVeLjicdXA2HfnDXmJJCxtI3rrWqUvsCEVBCQ\/640?wx_fmt=png\" data-type=\"png\" data-w=\"480\" data-fail=\"0\" \/><\/p>\n<p>\u56fe10 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