{"id":201462,"date":"2025-05-10T09:54:26","date_gmt":"2025-05-10T01:54:26","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201462\/"},"modified":"2025-05-10T09:54:26","modified_gmt":"2025-05-10T01:54:26","slug":"redis%e5%bf%ab%ef%bc%9f%e6%b7%b1%e5%85%a5%e8%a7%a3%e6%9e%90redis%e5%86%85%e5%ad%98%e6%a8%a1%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201462\/","title":{"rendered":"Redis\u5feb\uff1f\u6df1\u5165\u89e3\u6790Redis\u5185\u5b58\u6a21\u578b"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>Redis\u5feb\uff1f\u6df1\u5165\u89e3\u6790Redis\u5185\u5b58\u6a21\u578b<\/h1>\n<p><span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u672c\u7bc7\u6587\u7ae0\u5411\u5927\u5bb6\u4ecb\u7ecd\u300aRedis\u5feb\uff1f\u6df1\u5165\u89e3\u6790Redis\u5185\u5b58\u6a21\u578b\u300b\uff0c\u4e3b\u8981\u5305\u62ec\u5185\u5b58\u3001Redis\u3001\u6a21\u578b\uff0c\u5177\u6709\u4e00\u5b9a\u7684\u53c2\u8003\u4ef7\u503c\uff0c\u9700\u8981\u7684\u670b\u53cb\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u3002<\/p>\n<p>Redis \u662f\u76ee\u524d\u6700\u706b\u7206\u7684\u5185\u5b58\u6570\u636e\u5e93\u4e4b\u4e00\uff0c\u901a\u8fc7\u5728\u5185\u5b58\u4e2d\u8bfb\u5199\u6570\u636e\uff0c\u5927\u5927\u63d0\u9ad8\u4e86\u8bfb\u5199\u901f\u5ea6\uff0c\u53ef\u4ee5\u8bf4 Redis \u662f\u5b9e\u73b0\u7f51\u7ad9\u9ad8\u5e76\u53d1\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002<\/p>\n<p>\u6211\u4eec\u4f7f\u7528 Redis \u65f6\uff0c\u4f1a\u63a5\u89e6 Redis \u7684 5 \u79cd\u5bf9\u8c61\u7c7b\u578b\uff08\u5b57\u7b26\u4e32\u3001\u54c8\u5e0c\u3001\u5217\u8868\u3001\u96c6\u5408\u3001\u6709\u5e8f\u96c6\u5408\uff09\uff0c\u4e30\u5bcc\u7684\u7c7b\u578b\u662f Redis \u76f8\u5bf9\u4e8e Memcached \u7b49\u7684\u4e00\u5927\u4f18\u52bf\u3002<\/p>\n<p><span style=\"color: #33CCCC\">\u5728\u4e86\u89e3 Redis \u7684 5 \u79cd\u5bf9\u8c61\u7c7b\u578b\u7684\u7528\u6cd5\u548c\u7279\u70b9\u7684\u57fa\u7840\u4e0a\uff0c\u8fdb\u4e00\u6b65\u4e86\u89e3 Redis \u7684\u5185\u5b58\u6a21\u578b\uff0c\u5bf9 Redis \u7684\u4f7f\u7528\u6709\u5f88\u5927\u5e2e\u52a9\uff0c\u4f8b\u5982\uff1a<\/span><\/p>\n<ul>\n<li>\n<p>\u4f30\u7b97 Redis \u5185\u5b58\u4f7f\u7528\u91cf\u3002\u76ee\u524d\u4e3a\u6b62\uff0c\u5185\u5b58\u7684\u4f7f\u7528\u6210\u672c\u4ecd\u7136\u76f8\u5bf9\u8f83\u9ad8\uff0c\u4f7f\u7528\u5185\u5b58\u4e0d\u80fd\u65e0\u6240\u987e\u5fcc\uff1b\u6839\u636e\u9700\u6c42\u5408\u7406\u7684\u8bc4\u4f30 Redis \u7684\u5185\u5b58\u4f7f\u7528\u91cf\uff0c\u9009\u62e9\u5408\u9002\u7684\u673a\u5668\u914d\u7f6e\uff0c\u53ef\u4ee5\u5728\u6ee1\u8db3\u9700\u6c42\u7684\u60c5\u51b5\u4e0b\u8282\u7ea6\u6210\u672c\u3002<\/p>\n<\/li>\n<li>\n<p>\u4f18\u5316\u5185\u5b58\u5360\u7528\u3002\u4e86\u89e3 Redis \u5185\u5b58\u6a21\u578b\u53ef\u4ee5\u9009\u62e9\u66f4\u5408\u9002\u7684\u6570\u636e\u7c7b\u578b\u548c\u7f16\u7801\uff0c\u66f4\u597d\u7684\u5229\u7528 Redis \u5185\u5b58\u3002<\/p>\n<\/li>\n<li>\n<p>\u5206\u6790\u89e3\u51b3\u95ee\u9898\u3002\u5f53 Redis \u51fa\u73b0\u963b\u585e\u3001\u5185\u5b58\u5360\u7528\u7b49\u95ee\u9898\u65f6\uff0c\u5c3d\u5feb\u53d1\u73b0\u5bfc\u81f4\u95ee\u9898\u7684\u539f\u56e0\uff0c\u4fbf\u4e8e\u5206\u6790\u89e3\u51b3\u95ee\u9898\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u4ecb\u7ecd Redis \u7684\u5185\u5b58\u6a21\u578b\uff08\u4ee5 3.0 \u4e3a\u4f8b\uff09\uff0c\u5305\u62ec Redis \u5360\u7528\u5185\u5b58\u7684\u60c5\u51b5\u53ca\u5982\u4f55\u67e5\u8be2\u3001\u4e0d\u540c\u7684\u5bf9\u8c61\u7c7b\u578b\u5728\u5185\u5b58\u4e2d\u7684\u7f16\u7801\u65b9\u5f0f\u3001\u5185\u5b58\u5206\u914d\u5668(jemalloc)\u3001\u7b80\u5355\u52a8\u6001\u5b57\u7b26\u4e32(SDS)\u3001RedisObject \u7b49\uff1b\u7136\u540e\u5728\u6b64\u57fa\u7840\u4e0a\u4ecb\u7ecd\u51e0\u4e2a Redis \u5185\u5b58\u6a21\u578b\u7684\u5e94\u7528\u3002<\/p>\n<p><strong><span style=\"font-size: x-large\">Redis \u5185\u5b58\u7edf\u8ba1<\/span><\/strong><\/p>\n<p>\u5de5\u6b32\u5584\u5176\u4e8b\u5fc5\u5148\u5229\u5176\u5668\uff0c\u5728\u8bf4\u660e Redis \u5185\u5b58\u4e4b\u524d\u9996\u5148\u8bf4\u660e\u5982\u4f55\u7edf\u8ba1 Redis \u4f7f\u7528\u5185\u5b58\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u5728\u5ba2\u6237\u7aef\u901a\u8fc7 redis-cli \u8fde\u63a5\u670d\u52a1\u5668\u540e\uff08\u540e\u9762\u5982\u65e0\u7279\u6b8a\u8bf4\u660e\uff0c\u5ba2\u6237\u7aef\u4e00\u5f8b\u4f7f\u7528redis-cli\uff09\uff0c\u901a\u8fc7 info \u547d\u4ee4\u53ef\u4ee5\u67e5\u770b\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\uff1ainfo memory\u3002<\/p>\n<\/p>\n<p>\u5176\u4e2d\uff0cinfo \u547d\u4ee4\u53ef\u4ee5\u663e\u793a Redis \u670d\u52a1\u5668\u7684\u8bb8\u591a\u4fe1\u606f\uff0c\u5305\u62ec\u670d\u52a1\u5668\u57fa\u672c\u4fe1\u606f\u3001CPU\u3001\u5185\u5b58\u3001\u6301\u4e45\u5316\u3001\u5ba2\u6237\u7aef\u8fde\u63a5\u4fe1\u606f\u7b49\u7b49\uff1bMemory \u662f\u53c2\u6570\uff0c\u8868\u793a\u53ea\u663e\u793a\u5185\u5b58\u76f8\u5173\u7684\u4fe1\u606f\u3002<\/p>\n<p>\u8fd4\u56de\u7ed3\u679c\u4e2d\u6bd4\u8f83\u91cd\u8981\u7684\u51e0\u4e2a\u8bf4\u660e\u5982\u4e0b\uff1a<\/p>\n<p><strong><span style=\"font-size: large\">used_memory<\/span><\/strong><\/p>\n<p>Redis \u5206\u914d\u5668\u5206\u914d\u7684\u5185\u5b58\u603b\u91cf\uff08\u5355\u4f4d\u662f\u5b57\u8282\uff09\uff0c\u5305\u62ec\u4f7f\u7528\u7684\u865a\u62df\u5185\u5b58\uff08\u5373 swap\uff09\uff1bRedis \u5206\u914d\u5668\u540e\u9762\u4f1a\u4ecb\u7ecd\u3002used_memory_human \u53ea\u662f\u663e\u793a\u66f4\u53cb\u597d\u3002<\/p>\n<p><em><span style=\"font-size: large\">used_memory_rss<\/span><\/em><\/p>\n<p>Redis \u8fdb\u7a0b\u5360\u636e\u64cd\u4f5c\u7cfb\u7edf\u7684\u5185\u5b58\uff08\u5355\u4f4d\u662f\u5b57\u8282\uff09\uff0c\u4e0e top \u53ca ps \u547d\u4ee4\u770b\u5230\u7684\u503c\u662f\u4e00\u81f4\u7684\u3002<\/p>\n<p>\u9664\u4e86\u5206\u914d\u5668\u5206\u914d\u7684\u5185\u5b58\u4e4b\u5916\uff0cused_memory_rss \u8fd8\u5305\u62ec\u8fdb\u7a0b\u8fd0\u884c\u672c\u8eab\u9700\u8981\u7684\u5185\u5b58\u3001\u5185\u5b58\u788e\u7247\u7b49\uff0c\u4f46\u662f\u4e0d\u5305\u62ec\u865a\u62df\u5185\u5b58\u3002<\/p>\n<p>\u56e0\u6b64\uff0cused_memory \u548c used_memory_rss\uff0c\u524d\u8005\u662f\u4ece Redis \u89d2\u5ea6\u5f97\u5230\u7684\u91cf\uff0c\u540e\u8005\u662f\u4ece\u64cd\u4f5c\u7cfb\u7edf\u89d2\u5ea6\u5f97\u5230\u7684\u91cf\u3002<\/p>\n<p>\u4e8c\u8005\u4e4b\u6240\u4ee5\u6709\u6240\u4e0d\u540c\uff0c\u4e00\u65b9\u9762\u662f\u56e0\u4e3a\u5185\u5b58\u788e\u7247\u548c Redis \u8fdb\u7a0b\u8fd0\u884c\u9700\u8981\u5360\u7528\u5185\u5b58\uff0c\u4f7f\u5f97\u524d\u8005\u53ef\u80fd\u6bd4\u540e\u8005\u5c0f\uff0c\u53e6\u4e00\u65b9\u9762\u865a\u62df\u5185\u5b58\u7684\u5b58\u5728\uff0c\u4f7f\u5f97\u524d\u8005\u53ef\u80fd\u6bd4\u540e\u8005\u5927\u3002<\/p>\n<p>\u7531\u4e8e\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0cRedis \u7684\u6570\u636e\u91cf\u4f1a\u6bd4\u8f83\u5927\uff0c\u6b64\u65f6\u8fdb\u7a0b\u8fd0\u884c\u5360\u7528\u7684\u5185\u5b58\u4e0e Redis \u6570\u636e\u91cf\u548c\u5185\u5b58\u788e\u7247\u76f8\u6bd4\uff0c\u90fd\u4f1a\u5c0f\u5f97\u591a\u3002<\/p>\n<p>\u56e0\u6b64 used_memory_rss \u548c used_memory \u7684\u6bd4\u4f8b\uff0c\u4fbf\u6210\u4e86\u8861\u91cf Redis \u5185\u5b58\u788e\u7247\u7387\u7684\u53c2\u6570\uff1b\u8fd9\u4e2a\u53c2\u6570\u5c31\u662f mem_fragmentation_ratio\u3002<\/p>\n<p><strong><span style=\"font-size: large\">mem_fragmentation_ratio<\/span><\/strong><\/p>\n<p>\u5185\u5b58\u788e\u7247\u6bd4\u7387\uff0c\u8be5\u503c\u662f used_memory_rss \/ used_memory \u7684\u6bd4\u503c\u3002<\/p>\n<p>mem_fragmentation_ratio \u4e00\u822c\u5927\u4e8e 1\uff0c\u4e14\u8be5\u503c\u8d8a\u5927\uff0c\u5185\u5b58\u788e\u7247\u6bd4\u4f8b\u8d8a\u5927\uff1bmem_fragmentation_ratio<\/p>\n<p>\u5f53\u8fd9\u79cd\u60c5\u51b5\u51fa\u73b0\u65f6\uff0c\u5e94\u8be5\u53ca\u65f6\u6392\u67e5\uff0c\u5982\u679c\u5185\u5b58\u4e0d\u8db3\u5e94\u8be5\u53ca\u65f6\u5904\u7406\uff0c\u5982\u589e\u52a0 Redis \u8282\u70b9\u3001\u589e\u52a0 Redis \u670d\u52a1\u5668\u7684\u5185\u5b58\u3001\u4f18\u5316\u5e94\u7528\u7b49\u3002<\/p>\n<p>\u4e00\u822c\u6765\u8bf4\uff0cmem_fragmentation_ratio \u5728 1.03 \u5de6\u53f3\u662f\u6bd4\u8f83\u5065\u5eb7\u7684\u72b6\u6001\uff08\u5bf9\u4e8e jemalloc \u6765\u8bf4\uff09\u3002<\/p>\n<p>\u4e0a\u9762\u622a\u56fe\u4e2d\u7684 mem_fragmentation_ratio \u503c\u5f88\u5927\uff0c\u662f\u56e0\u4e3a\u8fd8\u6ca1\u6709\u5411 Redis \u4e2d\u5b58\u5165\u6570\u636e\uff0cRedis \u8fdb\u7a0b\u672c\u8eab\u8fd0\u884c\u7684\u5185\u5b58\u4f7f\u5f97 used_memory_rss \u6bd4 used_memory \u5927\u5f97\u591a\u3002<\/p>\n<p><strong><span style=\"font-size: large\">mem_allocator<\/span><\/strong><\/p>\n<p>Redis \u4f7f\u7528\u7684\u5185\u5b58\u5206\u914d\u5668\uff0c\u5728\u7f16\u8bd1\u65f6\u6307\u5b9a\uff1b\u53ef\u4ee5\u662f libc \u3001jemalloc \u6216\u8005 tcmalloc\uff0c\u9ed8\u8ba4\u662f jemalloc\uff1b\u622a\u56fe\u4e2d\u4f7f\u7528\u7684\u4fbf\u662f\u9ed8\u8ba4\u7684 jemalloc\u3002<\/p>\n<p><strong><span style=\"font-size: x-large\">Redis \u5185\u5b58\u5212\u5206<\/span><\/strong><\/p>\n<p>Redis \u4f5c\u4e3a\u5185\u5b58\u6570\u636e\u5e93\uff0c\u5728\u5185\u5b58\u4e2d\u5b58\u50a8\u7684\u5185\u5bb9\u4e3b\u8981\u662f\u6570\u636e\uff08\u952e\u503c\u5bf9\uff09\uff1b\u901a\u8fc7\u524d\u9762\u7684\u53d9\u8ff0\u53ef\u4ee5\u77e5\u9053\uff0c\u9664\u4e86\u6570\u636e\u4ee5\u5916\uff0cRedis \u7684\u5176\u4ed6\u90e8\u5206\u4e5f\u4f1a\u5360\u7528\u5185\u5b58\u3002<\/p>\n<p>Redis \u7684\u5185\u5b58\u5360\u7528\u4e3b\u8981\u53ef\u4ee5\u5212\u5206\u4e3a\u4ee5\u4e0b\u51e0\u4e2a\u90e8\u5206\uff1a<\/p>\n<p><strong><span style=\"font-size: large\">\u6570\u636e<\/span><\/strong><\/p>\n<p>\u4f5c\u4e3a\u6570\u636e\u5e93\uff0c\u6570\u636e\u662f\u6700\u4e3b\u8981\u7684\u90e8\u5206\uff1b\u8fd9\u90e8\u5206\u5360\u7528\u7684\u5185\u5b58\u4f1a\u7edf\u8ba1\u5728 used_memory \u4e2d\u3002<\/p>\n<p>Redis \u4f7f\u7528\u952e\u503c\u5bf9\u5b58\u50a8\u6570\u636e\uff0c\u5176\u4e2d\u7684\u503c\uff08\u5bf9\u8c61\uff09\u5305\u62ec 5 \u79cd\u7c7b\u578b\uff0c\u5373\u5b57\u7b26\u4e32\u3001\u54c8\u5e0c\u3001\u5217\u8868\u3001\u96c6\u5408\u3001\u6709\u5e8f\u96c6\u5408\u3002<\/p>\n<p>\u8fd9 5 \u79cd\u7c7b\u578b\u662f Redis \u5bf9\u5916\u63d0\u4f9b\u7684\uff0c\u5b9e\u9645\u4e0a\uff0c\u5728 Redis \u5185\u90e8\uff0c\u6bcf\u79cd\u7c7b\u578b\u53ef\u80fd\u6709 2 \u79cd\u6216\u66f4\u591a\u7684\u5185\u90e8\u7f16\u7801\u5b9e\u73b0\u3002<\/p>\n<p>\u6b64\u5916\uff0cRedis \u5728\u5b58\u50a8\u5bf9\u8c61\u65f6\uff0c\u5e76\u4e0d\u662f\u76f4\u63a5\u5c06\u6570\u636e\u6254\u8fdb\u5185\u5b58\uff0c\u800c\u662f\u4f1a\u5bf9\u5bf9\u8c61\u8fdb\u884c\u5404\u79cd\u5305\u88c5\uff1a\u5982 RedisObject\u3001SDS \u7b49\uff1b\u8fd9\u7bc7\u6587\u7ae0\u540e\u9762\u5c06\u91cd\u70b9\u4ecb\u7ecd Redis \u4e2d\u6570\u636e\u5b58\u50a8\u7684\u7ec6\u8282\u3002<\/p>\n<p><strong><span style=\"font-size: large\">\u8fdb\u7a0b\u672c\u8eab\u8fd0\u884c\u9700\u8981\u7684\u5185\u5b58<\/span><\/strong><\/p>\n<p>Redis \u4e3b\u8fdb\u7a0b\u672c\u8eab\u8fd0\u884c\u80af\u5b9a\u9700\u8981\u5360\u7528\u5185\u5b58\uff0c\u5982\u4ee3\u7801\u3001\u5e38\u91cf\u6c60\u7b49\u7b49\uff1b\u8fd9\u90e8\u5206\u5185\u5b58\u5927\u7ea6\u51e0\u5146\uff0c\u5728\u5927\u591a\u6570\u751f\u4ea7\u73af\u5883\u4e2d\u4e0e Redis \u6570\u636e\u5360\u7528\u7684\u5185\u5b58\u76f8\u6bd4\u53ef\u4ee5\u5ffd\u7565\u3002<\/p>\n<p>\u8fd9\u90e8\u5206\u5185\u5b58\u4e0d\u662f\u7531 jemalloc \u5206\u914d\uff0c\u56e0\u6b64\u4e0d\u4f1a\u7edf\u8ba1\u5728 used_memory \u4e2d\u3002<\/p>\n<p>\u8865\u5145\u8bf4\u660e\uff1a\u9664\u4e86\u4e3b\u8fdb\u7a0b\u5916\uff0cRedis \u521b\u5efa\u7684\u5b50\u8fdb\u7a0b\u8fd0\u884c\u4e5f\u4f1a\u5360\u7528\u5185\u5b58\uff0c\u5982 Redis \u6267\u884c AOF\u3001RDB \u91cd\u5199\u65f6\u521b\u5efa\u7684\u5b50\u8fdb\u7a0b\u3002<\/p>\n<p>\u5f53\u7136\uff0c\u8fd9\u90e8\u5206\u5185\u5b58\u4e0d\u5c5e\u4e8e Redis \u8fdb\u7a0b\uff0c\u4e5f\u4e0d\u4f1a\u7edf\u8ba1\u5728 used_memory \u548c used_memory_rss \u4e2d\u3002<\/p>\n<p><strong><span style=\"font-size: large\">\u7f13\u51b2\u5185\u5b58<\/span><\/strong><\/p>\n<p>\u7f13\u51b2\u5185\u5b58\u5305\u62ec\u5ba2\u6237\u7aef\u7f13\u51b2\u533a\u3001\u590d\u5236\u79ef\u538b\u7f13\u51b2\u533a\u3001AOF \u7f13\u51b2\u533a\u7b49\uff1b\u5176\u4e2d\uff0c\u5ba2\u6237\u7aef\u7f13\u51b2\u533a\u5b58\u50a8\u5ba2\u6237\u7aef\u8fde\u63a5\u7684\u8f93\u5165\u8f93\u51fa\u7f13\u51b2\uff1b\u590d\u5236\u79ef\u538b\u7f13\u51b2\u533a\u7528\u4e8e\u90e8\u5206\u590d\u5236\u529f\u80fd\uff1bAOF \u7f13\u51b2\u533a\u7528\u4e8e\u5728\u8fdb\u884c AOF \u91cd\u5199\u65f6\uff0c\u4fdd\u5b58\u6700\u8fd1\u7684\u5199\u5165\u547d\u4ee4\u3002<\/p>\n<p>\u5728\u4e86\u89e3\u76f8\u5e94\u529f\u80fd\u4e4b\u524d\uff0c\u4e0d\u9700\u8981\u77e5\u9053\u8fd9\u4e9b\u7f13\u51b2\u7684\u7ec6\u8282\uff1b\u8fd9\u90e8\u5206\u5185\u5b58\u7531 jemalloc \u5206\u914d\uff0c\u56e0\u6b64\u4f1a\u7edf\u8ba1\u5728 used_memory \u4e2d\u3002<\/p>\n<p><strong><span style=\"font-size: large\">\u5185\u5b58\u788e\u7247<\/span><\/strong><\/p>\n<p>\u5185\u5b58\u788e\u7247\u662f Redis \u5728\u5206\u914d\u3001\u56de\u6536\u7269\u7406\u5185\u5b58\u8fc7\u7a0b\u4e2d\u4ea7\u751f\u7684\u3002\u4f8b\u5982\uff0c\u5982\u679c\u5bf9\u6570\u636e\u7684\u66f4\u6539\u9891\u7e41\uff0c\u800c\u4e14\u6570\u636e\u4e4b\u95f4\u7684\u5927\u5c0f\u76f8\u5dee\u5f88\u5927\uff0c\u53ef\u80fd\u5bfc\u81f4 Redis \u91ca\u653e\u7684\u7a7a\u95f4\u5728\u7269\u7406\u5185\u5b58\u4e2d\u5e76\u6ca1\u6709\u91ca\u653e\u3002<\/p>\n<p>\u4f46 Redis \u53c8\u65e0\u6cd5\u6709\u6548\u5229\u7528\uff0c\u8fd9\u5c31\u5f62\u6210\u4e86\u5185\u5b58\u788e\u7247\uff0c\u5185\u5b58\u788e\u7247\u4e0d\u4f1a\u7edf\u8ba1\u5728 used_memory \u4e2d\u3002<\/p>\n<p>\u5185\u5b58\u788e\u7247\u7684\u4ea7\u751f\u4e0e\u5bf9\u6570\u636e\u8fdb\u884c\u7684\u64cd\u4f5c\u3001\u6570\u636e\u7684\u7279\u70b9\u7b49\u90fd\u6709\u5173\uff1b\u6b64\u5916\uff0c\u4e0e\u4f7f\u7528\u7684\u5185\u5b58\u5206\u914d\u5668\u4e5f\u6709\u5173\u7cfb\uff1a\u5982\u679c\u5185\u5b58\u5206\u914d\u5668\u8bbe\u8ba1\u5408\u7406\uff0c\u53ef\u4ee5\u5c3d\u53ef\u80fd\u7684\u51cf\u5c11\u5185\u5b58\u788e\u7247\u7684\u4ea7\u751f\u3002\u540e\u9762\u5c06\u8981\u8bf4\u5230\u7684 jemalloc \u4fbf\u5728\u63a7\u5236\u5185\u5b58\u788e\u7247\u65b9\u9762\u505a\u7684\u5f88\u597d\u3002<\/p>\n<p>\u5982\u679c Redis \u670d\u52a1\u5668\u4e2d\u7684\u5185\u5b58\u788e\u7247\u5df2\u7ecf\u5f88\u5927\uff0c\u53ef\u4ee5\u901a\u8fc7\u5b89\u5168\u91cd\u542f\u7684\u65b9\u5f0f\u51cf\u5c0f\u5185\u5b58\u788e\u7247\uff1a\u56e0\u4e3a\u91cd\u542f\u4e4b\u540e\uff0cRedis \u91cd\u65b0\u4ece\u5907\u4efd\u6587\u4ef6\u4e2d\u8bfb\u53d6\u6570\u636e\uff0c\u5728\u5185\u5b58\u4e2d\u8fdb\u884c\u91cd\u6392\uff0c\u4e3a\u6bcf\u4e2a\u6570\u636e\u91cd\u65b0\u9009\u62e9\u5408\u9002\u7684\u5185\u5b58\u5355\u5143\uff0c\u51cf\u5c0f\u5185\u5b58\u788e\u7247\u3002<\/p>\n<p><strong><span style=\"font-size: x-large\">Redis \u6570\u636e\u5b58\u50a8\u7684\u7ec6\u8282<\/span><\/strong><\/p>\n<p>\u5173\u4e8e Redis \u6570\u636e\u5b58\u50a8\u7684\u7ec6\u8282\uff0c\u6d89\u53ca\u5230\u5185\u5b58\u5206\u914d\u5668\uff08\u5982 jemalloc\uff09\u3001\u7b80\u5355\u52a8\u6001\u5b57\u7b26\u4e32\uff08SDS\uff09\u30015 \u79cd\u5bf9\u8c61\u7c7b\u578b\u53ca\u5185\u90e8\u7f16\u7801\u3001RedisObject\u3002\u5728\u8bb2\u8ff0\u5177\u4f53\u5185\u5bb9\u4e4b\u524d\uff0c\u5148\u8bf4\u660e\u4e00\u4e0b\u8fd9\u51e0\u4e2a\u6982\u5ff5\u4e4b\u95f4\u7684\u5173\u7cfb\u3002<\/p>\n<p>\u4e0b\u56fe\u662f\u6267\u884c set hello world \u65f6\uff0c\u6240\u6d89\u53ca\u5230\u7684\u6570\u636e\u6a21\u578b\uff1a<\/p>\n<\/p>\n<p>dictEntry\uff1aRedis \u662f Key-Value \u6570\u636e\u5e93\uff0c\u56e0\u6b64\u5bf9\u6bcf\u4e2a\u952e\u503c\u5bf9\u90fd\u4f1a\u6709\u4e00\u4e2a dictEntry\uff0c\u91cc\u9762\u5b58\u50a8\u4e86\u6307\u5411 Key \u548c Value \u7684\u6307\u9488\uff1bnext \u6307\u5411\u4e0b\u4e00\u4e2a dictEntry\uff0c\u4e0e\u672c Key-Value \u65e0\u5173\u3002<\/p>\n<p>Key\uff1a\u56fe\u4e2d\u53f3\u4e0a\u89d2\u53ef\u89c1\uff0cKey\uff08\u201dhello\u201d\uff09\u5e76\u4e0d\u662f\u76f4\u63a5\u4ee5\u5b57\u7b26\u4e32\u5b58\u50a8\uff0c\u800c\u662f\u5b58\u50a8\u5728 SDS \u7ed3\u6784\u4e2d\u3002<\/p>\n<p>RedisObject\uff1aValue(\u201cworld\u201d)\u65e2\u4e0d\u662f\u76f4\u63a5\u4ee5\u5b57\u7b26\u4e32\u5b58\u50a8\uff0c\u4e5f\u4e0d\u662f\u50cf Key \u4e00\u6837\u76f4\u63a5\u5b58\u50a8\u5728 SDS \u4e2d\uff0c\u800c\u662f\u5b58\u50a8\u5728 RedisObject \u4e2d\u3002<\/p>\n<p>\u5b9e\u9645\u4e0a\uff0c\u4e0d\u8bba Value \u662f 5 \u79cd\u7c7b\u578b\u7684\u54ea\u4e00\u79cd\uff0c\u90fd\u662f\u901a\u8fc7 RedisObject \u6765\u5b58\u50a8\u7684\uff1b\u800c RedisObject \u4e2d\u7684 type \u5b57\u6bb5\u6307\u660e\u4e86 Value \u5bf9\u8c61\u7684\u7c7b\u578b\uff0cptr \u5b57\u6bb5\u5219\u6307\u5411\u5bf9\u8c61\u6240\u5728\u7684\u5730\u5740\u3002<\/p>\n<p>\u4e0d\u8fc7\u53ef\u4ee5\u770b\u51fa\uff0c\u5b57\u7b26\u4e32\u5bf9\u8c61\u867d\u7136\u7ecf\u8fc7\u4e86 RedisObject \u7684\u5305\u88c5\uff0c\u4f46\u4ecd\u7136\u9700\u8981\u901a\u8fc7 SDS \u5b58\u50a8\u3002<\/p>\n<p>\u5b9e\u9645\u4e0a\uff0cRedisObject \u9664\u4e86 type \u548c ptr \u5b57\u6bb5\u4ee5\u5916\uff0c\u8fd8\u6709\u5176\u4ed6\u5b57\u6bb5\u56fe\u4e2d\u6ca1\u6709\u7ed9\u51fa\uff0c\u5982\u7528\u4e8e\u6307\u5b9a\u5bf9\u8c61\u5185\u90e8\u7f16\u7801\u7684\u5b57\u6bb5\u3002<\/p>\n<p>jemalloc\uff1a\u65e0\u8bba\u662f DictEntry \u5bf9\u8c61\uff0c\u8fd8\u662f RedisObject\u3001SDS \u5bf9\u8c61\uff0c\u90fd\u9700\u8981\u5185\u5b58\u5206\u914d\u5668\uff08\u5982 jemalloc\uff09\u5206\u914d\u5185\u5b58\u8fdb\u884c\u5b58\u50a8\u3002<\/p>\n<p>\u4ee5 DictEntry \u5bf9\u8c61\u4e3a\u4f8b\uff0c\u6709 3 \u4e2a\u6307\u9488\u7ec4\u6210\uff0c\u5728 64 \u4f4d\u673a\u5668\u4e0b\u5360 24 \u4e2a\u5b57\u8282\uff0cjemalloc \u4f1a\u4e3a\u5b83\u5206\u914d 32 \u5b57\u8282\u5927\u5c0f\u7684\u5185\u5b58\u5355\u5143\u3002<\/p>\n<p>\u4e0b\u9762\u6765\u5206\u522b\u4ecb\u7ecd jemalloc\u3001RedisObject\u3001SDS\u3001\u5bf9\u8c61\u7c7b\u578b\u53ca\u5185\u90e8\u7f16\u7801\u3002<\/p>\n<p><strong><span style=\"font-size: large\">jemalloc<\/span><\/strong><\/p>\n<p>Redis \u5728\u7f16\u8bd1\u65f6\u4fbf\u4f1a\u6307\u5b9a\u5185\u5b58\u5206\u914d\u5668\uff1b\u5185\u5b58\u5206\u914d\u5668\u53ef\u4ee5\u662f libc \u3001jemalloc \u6216\u8005 tcmalloc\uff0c\u9ed8\u8ba4\u662f jemalloc\u3002<\/p>\n<p>jemalloc \u4f5c\u4e3a Redis \u7684\u9ed8\u8ba4\u5185\u5b58\u5206\u914d\u5668\uff0c\u5728\u51cf\u5c0f\u5185\u5b58\u788e\u7247\u65b9\u9762\u505a\u7684\u76f8\u5bf9\u6bd4\u8f83\u597d\u3002<\/p>\n<p>jemalloc \u5728 64 \u4f4d\u7cfb\u7edf\u4e2d\uff0c\u5c06\u5185\u5b58\u7a7a\u95f4\u5212\u5206\u4e3a\u5c0f\u3001\u5927\u3001\u5de8\u5927\u4e09\u4e2a\u8303\u56f4\uff1b\u6bcf\u4e2a\u8303\u56f4\u5185\u53c8\u5212\u5206\u4e86\u8bb8\u591a\u5c0f\u7684\u5185\u5b58\u5757\u5355\u4f4d\uff1b\u5f53 Redis \u5b58\u50a8\u6570\u636e\u65f6\uff0c\u4f1a\u9009\u62e9\u5927\u5c0f\u6700\u5408\u9002\u7684\u5185\u5b58\u5757\u8fdb\u884c\u5b58\u50a8\u3002<\/p>\n<p>jemalloc \u5212\u5206\u7684\u5185\u5b58\u5355\u5143\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<\/p>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u9700\u8981\u5b58\u50a8\u5927\u5c0f\u4e3a 130 \u5b57\u8282\u7684\u5bf9\u8c61\uff0cjemalloc \u4f1a\u5c06\u5176\u653e\u5165 160 \u5b57\u8282\u7684\u5185\u5b58\u5355\u5143\u4e2d\u3002<\/p>\n<p><strong><span style=\"font-size: large\">RedisObject<\/span><\/strong><\/p>\n<p>\u524d\u9762\u8bf4\u5230\uff0cRedis \u5bf9\u8c61\u6709 5 \u79cd\u7c7b\u578b\uff1b\u65e0\u8bba\u662f\u54ea\u79cd\u7c7b\u578b\uff0cRedis \u90fd\u4e0d\u4f1a\u76f4\u63a5\u5b58\u50a8\uff0c\u800c\u662f\u901a\u8fc7 RedisObject \u5bf9\u8c61\u8fdb\u884c\u5b58\u50a8\u3002<\/p>\n<p>RedisObject \u5bf9\u8c61\u975e\u5e38\u91cd\u8981\uff0cRedis \u5bf9\u8c61\u7684\u7c7b\u578b\u3001\u5185\u90e8\u7f16\u7801\u3001\u5185\u5b58\u56de\u6536\u3001\u5171\u4eab\u5bf9\u8c61\u7b49\u529f\u80fd\uff0c\u90fd\u9700\u8981 RedisObject \u652f\u6301\uff0c\u4e0b\u9762\u5c06\u901a\u8fc7 RedisObject \u7684\u7ed3\u6784\u6765\u8bf4\u660e\u5b83\u662f\u5982\u4f55\u8d77\u4f5c\u7528\u7684\u3002<\/p>\n<p>RedisObject \u7684\u5b9a\u4e49\u5982\u4e0b\uff08\u4e0d\u540c\u7248\u672c\u7684 Redis \u53ef\u80fd\u7a0d\u7a0d\u6709\u6240\u4e0d\u540c\uff09\uff1a<\/p>\n<\/p>\n<p>RedisObject \u7684\u6bcf\u4e2a\u5b57\u6bb5\u7684\u542b\u4e49\u548c\u4f5c\u7528\u5982\u4e0b\uff1a<\/p>\n<p><strong>type<\/strong><\/p>\n<p>type \u5b57\u6bb5\u8868\u793a\u5bf9\u8c61\u7684\u7c7b\u578b\uff0c\u5360 4 \u4e2a\u6bd4\u7279\uff1b\u76ee\u524d\u5305\u62ec REDIS_STRING(\u5b57\u7b26\u4e32)\u3001REDIS_LIST (\u5217\u8868)\u3001REDIS_HASH(\u54c8\u5e0c)\u3001REDIS_SET(\u96c6\u5408)\u3001REDIS_ZSET(\u6709\u5e8f\u96c6\u5408)\u3002<\/p>\n<p>\u5f53\u6211\u4eec\u6267\u884c type \u547d\u4ee4\u65f6\uff0c\u4fbf\u662f\u901a\u8fc7\u8bfb\u53d6 RedisObject \u7684 type \u5b57\u6bb5\u83b7\u5f97\u5bf9\u8c61\u7684\u7c7b\u578b\uff1b\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<\/p>\n<p><strong>encoding<\/strong><\/p>\n<p>encoding \u8868\u793a\u5bf9\u8c61\u7684\u5185\u90e8\u7f16\u7801\uff0c\u5360 4 \u4e2a\u6bd4\u7279\u3002\u5bf9\u4e8e Redis \u652f\u6301\u7684\u6bcf\u79cd\u7c7b\u578b\uff0c\u90fd\u6709\u81f3\u5c11\u4e24\u79cd\u5185\u90e8\u7f16\u7801\uff0c\u4f8b\u5982\u5bf9\u4e8e\u5b57\u7b26\u4e32\uff0c\u6709 int\u3001embstr\u3001raw \u4e09\u79cd\u7f16\u7801\u3002<\/p>\n<p>\u901a\u8fc7 encoding \u5c5e\u6027\uff0cRedis \u53ef\u4ee5\u6839\u636e\u4e0d\u540c\u7684\u4f7f\u7528\u573a\u666f\u6765\u4e3a\u5bf9\u8c61\u8bbe\u7f6e\u4e0d\u540c\u7684\u7f16\u7801\uff0c\u5927\u5927\u63d0\u9ad8\u4e86 Redis \u7684\u7075\u6d3b\u6027\u548c\u6548\u7387\u3002<\/p>\n<p>\u4ee5\u5217\u8868\u5bf9\u8c61\u4e3a\u4f8b\uff0c\u6709\u538b\u7f29\u5217\u8868\u548c\u53cc\u7aef\u94fe\u8868\u4e24\u79cd\u7f16\u7801\u65b9\u5f0f\uff1b\u5982\u679c\u5217\u8868\u4e2d\u7684\u5143\u7d20\u8f83\u5c11\uff0cRedis \u503e\u5411\u4e8e\u4f7f\u7528\u538b\u7f29\u5217\u8868\u8fdb\u884c\u5b58\u50a8\uff0c\u56e0\u4e3a\u538b\u7f29\u5217\u8868\u5360\u7528\u5185\u5b58\u66f4\u5c11\uff0c\u800c\u4e14\u6bd4\u53cc\u7aef\u94fe\u8868\u53ef\u4ee5\u66f4\u5feb\u8f7d\u5165\u3002<\/p>\n<p>\u5f53\u5217\u8868\u5bf9\u8c61\u5143\u7d20\u8f83\u591a\u65f6\uff0c\u538b\u7f29\u5217\u8868\u5c31\u4f1a\u8f6c\u5316\u4e3a\u66f4\u9002\u5408\u5b58\u50a8\u5927\u91cf\u5143\u7d20\u7684\u53cc\u7aef\u94fe\u8868\u3002<\/p>\n<p>\u901a\u8fc7 object encoding \u547d\u4ee4\uff0c\u53ef\u4ee5\u67e5\u770b\u5bf9\u8c61\u91c7\u7528\u7684\u7f16\u7801\u65b9\u5f0f\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<\/p>\n<p>5 \u79cd\u5bf9\u8c61\u7c7b\u578b\u5bf9\u5e94\u7684\u7f16\u7801\u65b9\u5f0f\u4ee5\u53ca\u4f7f\u7528\u6761\u4ef6\uff0c\u5c06\u5728\u540e\u9762\u4ecb\u7ecd\u3002<\/p>\n<p><strong>lru<\/strong><\/p>\n<p>lru \u8bb0\u5f55\u7684\u662f\u5bf9\u8c61***\u4e00\u6b21\u88ab\u547d\u4ee4\u7a0b\u5e8f\u8bbf\u95ee\u7684\u65f6\u95f4\uff0c\u5360\u636e\u7684\u6bd4\u7279\u6570\u4e0d\u540c\u7684\u7248\u672c\u6709\u6240\u4e0d\u540c\uff08\u5982 4.0 \u7248\u672c\u5360 24 \u6bd4\u7279\uff0c2.6 \u7248\u672c\u5360 22 \u6bd4\u7279\uff09\u3002<\/p>\n<p>\u901a\u8fc7\u5bf9\u6bd4 lru \u65f6\u95f4\u4e0e\u5f53\u524d\u65f6\u95f4\uff0c\u53ef\u4ee5\u8ba1\u7b97\u67d0\u4e2a\u5bf9\u8c61\u7684\u7a7a\u8f6c\u65f6\u95f4\uff1bobject idletime \u547d\u4ee4\u53ef\u4ee5\u663e\u793a\u8be5\u7a7a\u8f6c\u65f6\u95f4\uff08\u5355\u4f4d\u662f\u79d2\uff09\u3002object idletime \u547d\u4ee4\u7684\u4e00\u4e2a\u7279\u6b8a\u4e4b\u5904\u5728\u4e8e\u5b83\u4e0d\u6539\u53d8\u5bf9\u8c61\u7684 lru \u503c\u3002<\/p>\n<\/p>\n<p>lru \u503c\u9664\u4e86\u901a\u8fc7 object idletime \u547d\u4ee4\u6253\u5370\u4e4b\u5916\uff0c\u8fd8\u4e0e Redis \u7684\u5185\u5b58\u56de\u6536\u6709\u5173\u7cfb\u3002<\/p>\n<p>\u5982\u679c Redis \u6253\u5f00\u4e86 maxmemory \u9009\u9879\uff0c\u4e14\u5185\u5b58\u56de\u6536\u7b97\u6cd5\u9009\u62e9\u7684\u662f volatile-lru \u6216 allkeys\u2014lru\uff0c\u90a3\u4e48\u5f53 Redis \u5185\u5b58\u5360\u7528\u8d85\u8fc7 maxmemory \u6307\u5b9a\u7684\u503c\u65f6\uff0cRedis \u4f1a\u4f18\u5148\u9009\u62e9\u7a7a\u8f6c\u65f6\u95f4\u6700\u957f\u7684\u5bf9\u8c61\u8fdb\u884c\u91ca\u653e\u3002<\/p>\n<p><strong>refcount<\/strong><\/p>\n<p>refcount \u4e0e\u5171\u4eab\u5bf9\u8c61\uff1arefcount \u8bb0\u5f55\u7684\u662f\u8be5\u5bf9\u8c61\u88ab\u5f15\u7528\u7684\u6b21\u6570\uff0c\u7c7b\u578b\u4e3a\u6574\u578b\u3002refcount \u7684\u4f5c\u7528\uff0c\u4e3b\u8981\u5728\u4e8e\u5bf9\u8c61\u7684\u5f15\u7528\u8ba1\u6570\u548c\u5185\u5b58\u56de\u6536\u3002<\/p>\n<p>\u5f53\u521b\u5efa\u65b0\u5bf9\u8c61\u65f6\uff0crefcount \u521d\u59cb\u5316\u4e3a 1\uff1b\u5f53\u6709\u65b0\u7a0b\u5e8f\u4f7f\u7528\u8be5\u5bf9\u8c61\u65f6\uff0crefcount \u52a0 1\uff1b\u5f53\u5bf9\u8c61\u4e0d\u518d\u88ab\u4e00\u4e2a\u65b0\u7a0b\u5e8f\u4f7f\u7528\u65f6\uff0crefcount \u51cf 1\uff1b\u5f53 refcount \u53d8\u4e3a 0 \u65f6\uff0c\u5bf9\u8c61\u5360\u7528\u7684\u5185\u5b58\u4f1a\u88ab\u91ca\u653e\u3002<\/p>\n<p>Redis \u4e2d\u88ab\u591a\u6b21\u4f7f\u7528\u7684\u5bf9\u8c61(refcount&gt;1)\uff0c\u79f0\u4e3a\u5171\u4eab\u5bf9\u8c61\u3002Redis \u4e3a\u4e86\u8282\u7701\u5185\u5b58\uff0c\u5f53\u6709\u4e00\u4e9b\u5bf9\u8c61\u91cd\u590d\u51fa\u73b0\u65f6\uff0c\u65b0\u7684\u7a0b\u5e8f\u4e0d\u4f1a\u521b\u5efa\u65b0\u7684\u5bf9\u8c61\uff0c\u800c\u662f\u4ecd\u7136\u4f7f\u7528\u539f\u6765\u7684\u5bf9\u8c61\u3002<\/p>\n<p>\u8fd9\u4e2a\u88ab\u91cd\u590d\u4f7f\u7528\u7684\u5bf9\u8c61\uff0c\u5c31\u662f\u5171\u4eab\u5bf9\u8c61\u3002\u76ee\u524d\u5171\u4eab\u5bf9\u8c61\u4ec5\u652f\u6301\u6574\u6570\u503c\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\u3002<\/p>\n<p>\u5171\u4eab\u5bf9\u8c61\u7684\u5177\u4f53\u5b9e\u73b0\uff1aRedis \u7684\u5171\u4eab\u5bf9\u8c61\u76ee\u524d\u53ea\u652f\u6301\u6574\u6570\u503c\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\u3002\u4e4b\u6240\u4ee5\u5982\u6b64\uff0c\u5b9e\u9645\u4e0a\u662f\u5bf9\u5185\u5b58\u548c CPU\uff08\u65f6\u95f4\uff09\u7684\u5e73\u8861\uff1a\u5171\u4eab\u5bf9\u8c61\u867d\u7136\u4f1a\u964d\u4f4e\u5185\u5b58\u6d88\u8017\uff0c\u4f46\u662f\u5224\u65ad\u4e24\u4e2a\u5bf9\u8c61\u662f\u5426\u76f8\u7b49\u5374\u9700\u8981\u6d88\u8017\u989d\u5916\u7684\u65f6\u95f4\u3002<\/p>\n<p>\u5bf9\u4e8e\u6574\u6570\u503c\uff0c\u5224\u65ad\u64cd\u4f5c\u590d\u6742\u5ea6\u4e3a O(1)\uff1b\u5bf9\u4e8e\u666e\u901a\u5b57\u7b26\u4e32\uff0c\u5224\u65ad\u590d\u6742\u5ea6\u4e3a O(n)\uff1b\u800c\u5bf9\u4e8e\u54c8\u5e0c\u3001\u5217\u8868\u3001\u96c6\u5408\u548c\u6709\u5e8f\u96c6\u5408\uff0c\u5224\u65ad\u7684\u590d\u6742\u5ea6\u4e3a O(n^2)\u3002<\/p>\n<p>\u867d\u7136\u5171\u4eab\u5bf9\u8c61\u53ea\u80fd\u662f\u6574\u6570\u503c\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0c\u4f46\u662f5\u79cd\u7c7b\u578b\u90fd\u53ef\u80fd\u4f7f\u7528\u5171\u4eab\u5bf9\u8c61\uff08\u5982\u54c8\u5e0c\u3001\u5217\u8868\u7b49\u7684\u5143\u7d20\u53ef\u4ee5\u4f7f\u7528\uff09\u3002<\/p>\n<p>\u5c31\u76ee\u524d\u7684\u5b9e\u73b0\u6765\u8bf4\uff0cRedis \u670d\u52a1\u5668\u5728\u521d\u59cb\u5316\u65f6\uff0c\u4f1a\u521b\u5efa 10000 \u4e2a\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0c\u503c\u5206\u522b\u662f 0~9999 \u7684\u6574\u6570\u503c\uff1b\u5f53 Redis \u9700\u8981\u4f7f\u7528\u503c\u4e3a 0~9999 \u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\u65f6\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u8fd9\u4e9b\u5171\u4eab\u5bf9\u8c61\u3002<\/p>\n<p>10000 \u8fd9\u4e2a\u6570\u5b57\u53ef\u4ee5\u901a\u8fc7\u8c03\u6574\u53c2\u6570 REDIS_SHARED_INTEGERS\uff084.0 \u4e2d\u662f OBJ_SHARED_INTEGERS\uff09\u7684\u503c\u8fdb\u884c\u6539\u53d8\u3002<\/p>\n<p>\u5171\u4eab\u5bf9\u8c61\u7684\u5f15\u7528\u6b21\u6570\u53ef\u4ee5\u901a\u8fc7 object refcount \u547d\u4ee4\u67e5\u770b\uff0c\u5982\u4e0b\u56fe\u6240\u793a\u3002\u547d\u4ee4\u6267\u884c\u7684\u7ed3\u679c\u9875\u4f50\u8bc1\u4e86\u53ea\u6709 0~9999 \u4e4b\u95f4\u7684\u6574\u6570\u4f1a\u4f5c\u4e3a\u5171\u4eab\u5bf9\u8c61\u3002<\/p>\n<\/p>\n<p><strong>ptr<\/strong><\/p>\n<p>ptr \u6307\u9488\u6307\u5411\u5177\u4f53\u7684\u6570\u636e\uff0c\u5982\u524d\u9762\u7684\u4f8b\u5b50\u4e2d\uff0cset hello world\uff0cptr \u6307\u5411\u5305\u542b\u5b57\u7b26\u4e32 world \u7684 SDS\u3002<\/p>\n<p>\u7efc\u4e0a\u6240\u8ff0\uff0cRedisObject \u7684\u7ed3\u6784\u4e0e\u5bf9\u8c61\u7c7b\u578b\u3001\u7f16\u7801\u3001\u5185\u5b58\u56de\u6536\u3001\u5171\u4eab\u5bf9\u8c61\u90fd\u6709\u5173\u7cfb\u3002<\/p>\n<p>\u4e00\u4e2a RedisObject \u5bf9\u8c61\u7684\u5927\u5c0f\u4e3a 16 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