{"id":279,"date":"2016-08-25T09:27:51","date_gmt":"2016-08-25T09:27:51","guid":{"rendered":"http:\/\/blog.chen-hongyi.com\/?p=279"},"modified":"2016-08-25T09:27:51","modified_gmt":"2016-08-25T09:27:51","slug":"%e8%af%91linux%e6%80%a7%e8%83%bd%e5%88%86%e6%9e%90%e7%9a%84%e5%89%8d60000%e6%af%ab%e7%a7%92-36","status":"publish","type":"post","link":"https:\/\/chen-hongyi.com\/?p=279","title":{"rendered":"[\u8bd1]Linux\u6027\u80fd\u5206\u6790\u7684\u524d60000\u6beb\u79d2 #36"},"content":{"rendered":"

https:\/\/github.com\/spacewander\/blogWithMarkdown\/issues\/36<\/p>\n

 <\/p>\n

 <\/p>\n

\u539f\u6587\u94fe\u63a5\uff1ahttp:\/\/techblog.netflix.com\/2015\/11\/linux-performance-analysis-in-60s.html<\/a>
\n\u4f5c\u8005\u662fBrendan Gregg\uff0c Oracle\/Linux\u7cfb\u7edf\u6027\u80fd\u5206\u6790\u65b9\u9762\u7684\u5927\u725b\u3002<\/p>\n

Linux\u6027\u80fd\u5206\u6790\u7684\u524d60000\u6beb\u79d2<\/h1>\n

\u4e3a\u4e86\u89e3\u51b3\u6027\u80fd\u95ee\u9898\uff0c\u4f60\u767b\u5165\u4e86\u4e00\u53f0Linux\u670d\u52a1\u5668\uff0c\u5728\u6700\u5f00\u59cb\u7684\u4e00\u5206\u949f\u5185\u9700\u8981\u67e5\u770b\u4ec0\u4e48\uff1f<\/p>\n

\u5728Netflix\u6211\u4eec\u6709\u4e00\u4e2a\u5e9e\u5927\u7684EC2 Linux\u96c6\u7fa4\uff0c\u8fd8\u6709\u975e\u5e38\u591a\u7684\u6027\u80fd\u5206\u6790\u5de5\u5177\u6765\u76d1\u63a7\u548c\u8c03\u67e5\u5b83\u7684\u6027\u80fd\u3002\u5176\u4e2d\u5305\u62ec\u7528\u4e8e\u4e91\u76d1\u63a7\u7684Atlas<\/a>\uff0c\u7528\u4e8e\u5b9e\u4f8b\u6309\u9700\u5206\u6790\u7684Vector<\/a>\u3002\u5373\u4f7f\u8fd9\u4e9b\u5de5\u5177\u5e2e\u52a9\u6211\u4eec\u89e3\u51b3\u4e86\u5927\u591a\u6570\u95ee\u9898\uff0c\u6211\u4eec\u6709\u65f6\u8fd8\u662f\u5f97\u767b\u5165Linux\u5b9e\u4f8b\uff0c\u8fd0\u884c\u4e00\u4e9b\u6807\u51c6\u7684Linux\u6027\u80fd\u5de5\u5177\u6765\u89e3\u51b3\u95ee\u9898\u3002<\/p>\n

\u5728\u8fd9\u7bc7\u6587\u7ae0\u91cc\uff0cNetflix Performance Engineering\u56e2\u961f\u5c06\u4f7f\u7528\u5c45\u5bb6\u5e38\u5907\u7684Linux\u6807\u51c6\u547d\u4ee4\u884c\u5de5\u5177\uff0c\u6f14\u793a\u5728\u6027\u80fd\u8c03\u67e5\u6700\u5f00\u59cb\u768460\u79d2\u91cc\u8981\u5e72\u7684\u4e8b\uff0c<\/p>\n

\u6700\u5f00\u59cb\u768460\u79d2……<\/h2>\n

\u8fd0\u884c\u4e0b\u976210\u4e2a\u547d\u4ee4\uff0c\u4f60\u53ef\u4ee5\u572860\u79d2\u5185\u5c31\u5bf9\u7cfb\u7edf\u8d44\u6e90\u7684\u4f7f\u7528\u60c5\u51b5\u548c\u8fdb\u7a0b\u7684\u8fd0\u884c\u72b6\u51b5\u6709\u5927\u4f53\u4e0a\u7684\u4e86\u89e3\u3002\u65e0\u975e\u662f\u5148\u67e5\u770b\u9519\u8bef\u4fe1\u606f\u548c\u9971\u548c\u6307\u6807\uff0c\u518d\u770b\u4e0b\u8d44\u6e90\u7684\u4f7f\u7528\u91cf\u3002\u8fd9\u91cc\u201c\u9971\u548c\u201d\u7684\u610f\u601d\u662f\uff0c\u67d0\u9879\u8d44\u6e90\u4f9b\u4e0d\u5e94\u6c42\uff0c\u5df2\u7ecf\u9020\u6210\u4e86\u8bf7\u6c42\u961f\u5217\u7684\u5806\u79ef\uff0c\u6216\u8005\u5ef6\u957f\u4e86\u7b49\u5f85\u65f6\u95f4\u3002<\/p>\n

uptime\r\ndmesg | tail\r\nvmstat 1\r\nmpstat -P ALL 1\r\npidstat 1\r\niostat -xz 1\r\nfree -m\r\nsar -n DEV 1\r\nsar -n TCP,ETCP 1\r\ntop\r\n<\/code><\/pre>\n
\u6709\u4e9b\u547d\u4ee4\u9700\u8981\u4f60\u5b89\u88c5sysstat<\/code>\u5305\u3002\uff08\u8bd1\u6ce8\uff1a\u6307mpstat, pidstat, iostat\u548csar\uff0c\u7528\u5305\u7ba1\u7406\u5668\u76f4\u63a5\u5b89\u88c5sysstat\u5373\u53ef\uff09 \u8fd9\u4e9b\u547d\u4ee4\u6240\u63d0\u4f9b\u7684\u6307\u6807\u80fd\u591f\u5e2e\u52a9\u4f60\u5b9e\u8df5USE<\/a>\u65b9\u6cd5\uff1a\u8fd9\u662f\u4e00\u79cd\u7528\u4e8e\u5b9a\u4f4d\u6027\u80fd\u74f6\u9888\u7684\u65b9\u6cd5\u8bba\u3002\u4f60\u53ef\u4ee5\u4ee5\u6b64\u68c0\u67e5\u6240\u6709\u8d44\u6e90\uff08CPU\uff0c\u5185\u5b58\uff0c\u786c\u76d8\uff0c\u7b49\u7b49\uff09\u7684\u4f7f\u7528\u91cf\uff0c\u662f\u5426\u9971\u548c\uff0c\u4ee5\u53ca\u662f\u5426\u5b58\u5728\u9519\u8bef\u3002\u540c\u65f6\u8bf7\u7559\u610f\u4e0a\u4e00\u6b21\u68c0\u67e5\u6b63\u5e38\u7684\u65f6\u523b\uff0c\u8fd9\u5c06\u5e2e\u52a9\u4f60\u51cf\u5c11\u5f85\u5206\u6790\u7684\u5bf9\u8c61\uff0c\u5e76\u6307\u660e\u8c03\u67e5\u7684\u65b9\u5411\u3002\uff08\u8bd1\u6ce8\uff1aUSE\u65b9\u6cd5\uff0c\u5c31\u662f\u68c0\u67e5\u6bcf\u4e00\u9879\u8d44\u6e90\u7684\u4f7f\u7528\u91cf\uff08utilization\uff09\u3001\u9971\u548c\uff08saturation\uff09\u3001\u9519\u8bef\uff08error\uff09\uff09<\/p>\n
\u63a5\u4e0b\u6765\u7684\u7ae0\u8282\u91cc\u6211\u4eec\u5c06\u7ed3\u5408\u5b9e\u9645\u4f8b\u5b50\u8bb2\u89e3\u8fd9\u4e9b\u547d\u4ee4\u3002\u5982\u679c\u4f60\u60f3\u4e86\u89e3\u66f4\u591a\u7684\u76f8\u5173\u4fe1\u606f\uff0c\u8bf7\u67e5\u770b\u5b83\u4eec\u7684man page\u3002<\/p>\n
1. uptime<\/h3>\n
$ uptime\r\n 23:51:26 up 21:31,  1 user,  load average: 30.02, 26.43, 19.02\r\n<\/code><\/pre>\n
\u8fd9\u4e2a\u547d\u4ee4\u663e\u793a\u4e86\u8981\u8fd0\u884c\u7684\u4efb\u52a1\uff08\u8fdb\u7a0b\uff09\u6570\uff0c\u901a\u8fc7\u5b83\u80fd\u591f\u5feb\u901f\u4e86\u89e3\u7cfb\u7edf\u7684\u5e73\u5747\u8d1f\u8f7d\u3002\u5728Linux\u4e0a\uff0c\u8fd9\u4e9b\u6570\u503c\u65e2\u5305\u62ec\u6b63\u5728\u6216\u51c6\u5907\u8fd0\u884c\u5728CPU\u4e0a\u7684\u8fdb\u7a0b\uff0c\u4e5f\u5305\u62ec\u963b\u585e\u5728uninterruptible I\/O\uff08\u901a\u5e38\u662f\u78c1\u76d8I\/O\uff09\u4e0a\u7684\u8fdb\u7a0b\u3002\u5b83\u5c55\u793a\u4e86\u8d44\u6e90\u8d1f\u8f7d\uff08\u6216\u9700\u6c42\uff09\u7684\u5927\u81f4\u60c5\u51b5\uff0c\u4e0d\u8fc7\u8fdb\u4e00\u6b65\u7684\u89e3\u8bfb\u8fd8\u6709\u5f85\u5176\u5b83\u5de5\u5177\u7684\u534f\u52a9\u3002\u5bf9\u5b83\u7684\u5177\u4f53\u6570\u503c\u4e0d\u7528\u592a\u8f83\u771f\u3002<\/p>\n
\u6700\u53f3\u7684\u4e09\u4e2a\u6570\u503c\u5206\u522b\u662f1\u5206\u949f\u30015\u5206\u949f\u300115\u5206\u949f\u7cfb\u7edf\u8d1f\u8f7d\u7684\u79fb\u52a8\u5e73\u5747\u503c\u3002\u5b83\u4eec\u5171\u540c\u5c55\u73b0\u4e86\u8d1f\u8f7d\u968f\u65f6\u95f4\u53d8\u52a8\u7684\u60c5\u51b5\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5047\u8bbe\u4f60\u88ab\u8981\u6c42\u53bb\u68c0\u67e5\u4e00\u4e2a\u51fa\u4e86\u95ee\u9898\u7684\u670d\u52a1\u5668\uff0c\u800c\u5b83\u6700\u8fd11\u5206\u949f\u7684\u8d1f\u8f7d\u8fdc\u8fdc\u4f4e\u4e8e15\u5206\u949f\u7684\u8d1f\u8f7d\uff0c\u90a3\u4e48\u4f60\u5f88\u53ef\u80fd\u5df2\u7ecf\u6251\u4e86\u4e2a\u7a7a\u3002<\/p>\n
\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u8d1f\u8f7d\u5747\u503c\u6700\u8fd1\u5448\u4e0a\u5347\u6001\u52bf\uff0c\u5176\u4e2d1\u5206\u949f\u503c\u9ad8\u8fbe30\uff0c\u800c15\u5206\u949f\u503c\u4ec5\u670919\u3002\u8fd9\u79cd\u73b0\u8c61\u6709\u8bb8\u591a\u79cd\u89e3\u91ca\uff0c\u5f88\u6709\u53ef\u80fd\u662f\u5bf9CPU\u7684\u4e89\u7528\uff1b\u8be5\u7cfb\u5217\u7684\u7b2c3\u4e2a\u548c\u7b2c4\u4e2a\u547d\u4ee4\u2014\u2014vmstat<\/code>\u548cmpstat<\/code>\u2014\u2014\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u8fdb\u4e00\u6b65\u786e\u5b9a\u95ee\u9898\u6240\u5728\u3002<\/p>\n
2. dmesg | tail<\/h3>\n
$ dmesg | tail\r\n[1880957.563150] perl invoked oom-killer: gfp_mask=0x280da, order=0, oom_score_adj=0\r\n[...]\r\n[1880957.563400] Out of memory: Kill process 18694 (perl) score 246 or sacrifice child\r\n[1880957.563408] Killed process 18694 (perl) total-vm:1972392kB, anon-rss:1953348kB, file-rss:0kB\r\n[2320864.954447] TCP: Possible SYN flooding on port 7001. Dropping request.  Check SNMP counters.\r\n<\/code><\/pre>\n
\u8fd9\u4e2a\u547d\u4ee4\u663e\u793a\u4e86\u6700\u65b0\u768410\u4e2a\u7cfb\u7edf\u4fe1\u606f\uff0c\u5982\u679c\u6709\u7684\u8bdd\u3002\u6ce8\u610f\u4f1a\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u7684\u9519\u8bef\u4fe1\u606f\u3002\u4e0a\u9762\u7684\u4f8b\u5b50\u91cc\u5c31\u5305\u62ec\u5bf9\u8fc7\u591a\u5360\u7528\u5185\u5b58\u7684\u67d0\u8fdb\u7a0b\u7684\u6b7b\u5211\u5224\u51b3\uff0c\u8fd8\u6709\u4e22\u5f03TCP\u8bf7\u6c42\u7684\u516c\u544a\u3002<\/p>\n
\u4e0d\u8981\u6f0f\u4e86\u8fd9\u4e00\u6b65\uff01\u68c0\u67e5dmesg<\/code>\u603b\u662f\u503c\u5f97\u7684\u3002<\/p>\n
3. vmstat 1<\/h3>\n
$ vmstat 1\r\nprocs ---------memory---------- ---swap-- -----io---- -system-- ------cpu-----\r\n r  b swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st\r\n34  0    0 200889792  73708 591828    0    0     0     5    6   10 96  1  3  0  0\r\n32  0    0 200889920  73708 591860    0    0     0   592 13284 4282 98  1  1  0  0\r\n32  0    0 200890112  73708 591860    0    0     0     0 9501 2154 99  1  0  0  0\r\n32  0    0 200889568  73712 591856    0    0     0    48 11900 2459 99  0  0  0  0\r\n32  0    0 200890208  73712 591860    0    0     0     0 15898 4840 98  1  1  0  0\r\n^C\r\n<\/code><\/pre>\n
vmstat(8)<\/code>\uff0c\u662f\u201cvirtual memory stat\u201d\u7684\u7b80\u79f0\uff0c\u51e0\u5341\u5e74\u524d\u5c31\u5df2\u7ecf\u5305\u62ec\u5728BSD\u5957\u4ef6\u4e4b\u4e2d\uff0c\u4e00\u76f4\u4ee5\u6765\u90fd\u662f\u5c45\u5bb6\u5e38\u5907\u7684\u5de5\u5177\u3002\u5b83\u4f1a\u9010\u884c\u8f93\u51fa\u670d\u52a1\u5668\u5173\u952e\u6570\u636e\u7684\u7edf\u8ba1\u7ed3\u679c\u3002<\/p>\n
\u901a\u8fc7\u6307\u5b9a1<\/code>\u4f5c\u4e3avmstat\u7684\u8f93\u5165\u53c2\u6570\uff0c\u5b83\u4f1a\u8f93\u51fa\u6bcf\u4e00\u79d2\u5185\u7684\u7edf\u8ba1\u7ed3\u679c\u3002\uff08\u5728\u6211\u4eec\u5f53\u524d\u4f7f\u7528\u7684\uff09vmstat\u8f93\u51fa\u7684\u7b2c\u4e00\u884c\u6570\u636e\u662f\u4ece\u542f\u52a8\u5230\u73b0\u5728\u7684\u5e73\u5747\u6570\u636e\uff0c\u800c\u4e0d\u662f\u524d\u4e00\u79d2\u7684\u6570\u636e\u3002\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u8df3\u8fc7\u7b2c\u4e00\u884c\uff0c\u770b\u770b\u540e\u9762\u51e0\u884c\u7684\u60c5\u51b5\u3002<\/p>\n
\u68c0\u67e5\u4e0b\u9762\u5404\u5217\uff1a<\/p>\n
r\uff1a\u7b49\u5f85CPU\u7684\u8fdb\u7a0b\u6570\u3002\u8be5\u6307\u6807\u80fd\u66f4\u597d\u5730\u5224\u5b9aCPU\u662f\u5426\u9971\u548c\uff0c\u56e0\u4e3a\u5b83\u4e0d\u5305\u62ecI\/O\u3002\u7b80\u5355\u5730\u8bf4\uff0cr\u503c\u9ad8\u4e8eCPU\u6570\u65f6\u5c31\u610f\u5473\u7740\u9971\u548c\u3002<\/p>\n
free\uff1a\u7a7a\u95f2\u7684\u5185\u5b58\u5343\u5b57\u8282\u6570\u3002\u5982\u679c\u4f60\u6570\u4e0d\u6e05\u6709\u591a\u5c11\u4f4d\uff0c\u5c31\u8bf4\u660e\u7cfb\u7edf\u5185\u5b58\u662f\u5145\u8db3\u7684\u3002\u63a5\u4e0b\u6765\u8981\u8bb2\u5230\u7684\u7b2c7\u4e2a\u547d\u4ee4\uff0cfree -m<\/code>\uff0c\u80fd\u591f\u66f4\u6e05\u695a\u5730\u8bf4\u660e\u7a7a\u95f2\u5185\u5b58\u7684\u72b6\u6001\u3002<\/p>\n
si\uff0cso\uff1aSwap-ins\u548cSwap-outs\u3002\u5982\u679c\u5b83\u4eec\u4e0d\u4e3a\u96f6\uff0c\u610f\u5473\u7740\u5185\u5b58\u5df2\u7ecf\u4e0d\u8db3\uff0c\u5f00\u59cb\u52a8\u7528\u4ea4\u6362\u7a7a\u95f4\u7684\u5b58\u7cae\u4e86\u3002<\/p>\n
us\uff0csy\uff0cid\uff0cwa\uff0cst\uff1a\u5b83\u4eec\u662f\u6240\u6709CPU\u7684\u4f7f\u7528\u767e\u5206\u6bd4\u3002\u5b83\u4eec\u5206\u522b\u8868\u793auser time\uff0csystem time\uff08\u5904\u4e8e\u5185\u6838\u6001\u7684\u65f6\u95f4\uff09\uff0cidle\uff0cwait I\/O\u548csteal time\uff08\u88ab\u5176\u5b83\u79df\u6237\uff0c\u6216\u8005\u662f\u79df\u6237\u81ea\u5df1\u7684Xen\u9694\u79bb\u8bbe\u5907\u9a71\u52a8\u57df\uff08isolated driver domain\uff09\uff0c\u6240\u5360\u7528\u7684\u65f6\u95f4\uff09\u3002<\/p>\n
\u901a\u8fc7\u76f8\u52a0us\u548csy\u7684\u767e\u5206\u6bd4\uff0c\u4f60\u53ef\u4ee5\u786e\u5b9aCPU\u662f\u5426\u5904\u4e8e\u5fd9\u788c\u72b6\u6001\u3002\u4e00\u4e2a\u6301\u7eed\u4e0d\u53d8\u7684wait I\/O\u610f\u5473\u7740\u74f6\u9888\u5728\u786c\u76d8\u4e0a\uff0c\u8fd9\u79cd\u60c5\u51b5\u5f80\u5f80\u4f34\u968f\u7740CPU\u7684\u7a7a\u95f2\uff0c\u56e0\u4e3a\u4efb\u52a1\u90fd\u5361\u5728\u78c1\u76d8I\/O\u4e0a\u4e86\u3002\u4f60\u53ef\u4ee5\u628await I\/O\u5f53\u4f5cCPU\u7a7a\u95f2\u7684\u53e6\u4e00\u79cd\u5f62\u5f0f\uff0c\u5b83\u989d\u5916\u7ed9\u51fa\u4e86CPU\u7a7a\u95f2\u7684\u7ebf\u7d22\u3002<\/p>\n
I\/O\u5904\u7406\u540c\u6837\u4f1a\u6d88\u8017\u7cfb\u7edf\u65f6\u95f4\u3002\u4e00\u4e2a\u9ad8\u4e8e20%\u7684\u5e73\u5747\u7cfb\u7edf\u65f6\u95f4\uff0c\u5f80\u5f80\u503c\u5f97\u8fdb\u4e00\u6b65\u53d1\u6398\uff1a\u4e5f\u8bb8\u7cfb\u7edf\u82b1\u5728I\/O\u7684\u65f6\u592a\u957f\u4e86\u3002<\/p>\n
\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0cCPU\u57fa\u672c\u628a\u65f6\u95f4\u82b1\u5728\u7528\u6237\u6001\u91cc\u9762\uff0c\u610f\u5473\u7740\u8dd1\u5728\u4e0a\u9762\u7684\u5e94\u7528\u5360\u7528\u4e86\u5927\u90e8\u5206\u65f6\u95f4\u3002\u6b64\u5916\uff0cCPU\u5e73\u5747\u4f7f\u7528\u7387\u572890%\u4e4b\u4e0a\u3002\u8fd9\u4e0d\u4e00\u5b9a\u662f\u4e2a\u95ee\u9898\uff1b\u68c0\u67e5\u4e0b\u201cr\u201d\u5217\uff0c\u770b\u770b\u662f\u5426\u9971\u548c\u4e86\u3002<\/p>\n
4. mpstat -P ALL 1<\/h3>\n
$ mpstat -P ALL 1\r\nLinux 3.13.0-49-generic (titanclusters-xxxxx)  07\/14\/2015  _x86_64_ (32 CPU)\r\n\r\n07:38:49 PM  CPU   %usr  %nice   %sys %iowait   %irq  %soft  %steal  %guest  %gnice  %idle\r\n07:38:50 PM  all  98.47   0.00   0.75    0.00   0.00   0.00    0.00    0.00    0.00   0.78\r\n07:38:50 PM    0  96.04   0.00   2.97    0.00   0.00   0.00    0.00    0.00    0.00   0.99\r\n07:38:50 PM    1  97.00   0.00   1.00    0.00   0.00   0.00    0.00    0.00    0.00   2.00\r\n07:38:50 PM    2  98.00   0.00   1.00    0.00   0.00   0.00    0.00    0.00    0.00   1.00\r\n07:38:50 PM    3  96.97   0.00   0.00    0.00   0.00   0.00    0.00    0.00    0.00   3.03\r\n[...]\r\n<\/code><\/pre>\n
\u8fd9\u4e2a\u547d\u4ee4\u663e\u793a\u6bcf\u4e2aCPU\u7684\u65f6\u95f4\u4f7f\u7528\u767e\u5206\u6bd4\uff0c\u4f60\u53ef\u4ee5\u7528\u5b83\u6765\u68c0\u67e5CPU\u662f\u5426\u5b58\u5728\u8d1f\u8f7d\u4e0d\u5747\u8861\u3002\u5355\u4e2a\u8fc7\u4e8e\u5fd9\u788c\u7684CPU\u53ef\u80fd\u610f\u5473\u7740\u6574\u4e2a\u5e94\u7528\u53ea\u6709\u5355\u4e2a\u7ebf\u7a0b\u5728\u5de5\u4f5c\u3002<\/p>\n
5. pidstat 1<\/h3>\n
$ pidstat 1\r\nLinux 3.13.0-49-generic (titanclusters-xxxxx)  07\/14\/2015    _x86_64_    (32 CPU)\r\n\r\n07:41:02 PM   UID       PID    %usr %system  %guest    %CPU   CPU  Command\r\n07:41:03 PM     0         9    0.00    0.94    0.00    0.94     1  rcuos\/0\r\n07:41:03 PM     0      4214    5.66    5.66    0.00   11.32    15  mesos-slave\r\n07:41:03 PM     0      4354    0.94    0.94    0.00    1.89     8  java\r\n07:41:03 PM     0      6521 1596.23    1.89    0.00 1598.11    27  java\r\n07:41:03 PM     0      6564 1571.70    7.55    0.00 1579.25    28  java\r\n07:41:03 PM 60004     60154    0.94    4.72    0.00    5.66     9  pidstat\r\n\r\n07:41:03 PM   UID       PID    %usr %system  %guest    %CPU   CPU  Command\r\n07:41:04 PM     0      4214    6.00    2.00    0.00    8.00    15  mesos-slave\r\n07:41:04 PM     0      6521 1590.00    1.00    0.00 1591.00    27  java\r\n07:41:04 PM     0      6564 1573.00   10.00    0.00 1583.00    28  java\r\n07:41:04 PM   108      6718    1.00    0.00    0.00    1.00     0  snmp-pass\r\n07:41:04 PM 60004     60154    1.00    4.00    0.00    5.00     9  pidstat\r\n^C\r\n<\/code><\/pre>\n
pidstat<\/code>\u770b\u4e0a\u53bb\u5c31\u50cftop<\/code>\uff0c\u4e0d\u8fc7top<\/code>\u7684\u8f93\u51fa\u4f1a\u8986\u76d6\u6389\u4e4b\u524d\u7684\u8f93\u51fa\uff0c\u800cpidstat<\/code>\u7684\u8f93\u51fa\u5219\u6dfb\u52a0\u5728\u4e4b\u524d\u7684\u8f93\u51fa\u7684\u540e\u9762\u3002\u8fd9\u6709\u5229\u4e8e\u89c2\u5bdf\u6570\u636e\u968f\u65f6\u95f4\u7684\u53d8\u52a8\u60c5\u51b5\uff0c\u4e5f\u4fbf\u4e8e\u628a\u4f60\u770b\u5230\u7684\u5185\u5bb9\u590d\u5236\u7c98\u8d34\u5230\u8c03\u67e5\u62a5\u544a\u4e2d\u3002<\/p>\n
\u4e0a\u9762\u7684\u4f8b\u5b50\u8868\u660e\uff0cCPU\u4e3b\u8981\u6d88\u8017\u5728\u4e24\u4e2ajava\u8fdb\u7a0b\u4e0a\u3002%CPU<\/code>\u5217\u662f\u5728\u5404\u4e2aCPU\u4e0a\u7684\u4f7f\u7528\u91cf\u7684\u603b\u548c\uff1b1591%<\/code>\u610f\u5473\u7740java\u8fdb\u7a0b\u6d88\u8017\u4e86\u5c06\u8fd116\u4e2aCPU\u3002<\/p>\n
6. iostat -xz 1<\/h3>\n
$ iostat -xz 1\r\nLinux 3.13.0-49-generic (titanclusters-xxxxx)  07\/14\/2015  _x86_64_ (32 CPU)\r\n\r\navg-cpu:  %user   %nice %system %iowait  %steal   %idle\r\n          73.96    0.00    3.73    0.03    0.06   22.21\r\n\r\nDevice:   rrqm\/s   wrqm\/s     r\/s     w\/s    rkB\/s    wkB\/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util\r\nxvda        0.00     0.23    0.21    0.18     4.52     2.08    34.37     0.00    9.98   13.80    5.42   2.44   0.09\r\nxvdb        0.01     0.00    1.02    8.94   127.97   598.53   145.79     0.00    0.43    1.78    0.28   0.25   0.25\r\nxvdc        0.01     0.00    1.02    8.86   127.79   595.94   146.50     0.00    0.45    1.82    0.30   0.27   0.26\r\ndm-0        0.00     0.00    0.69    2.32    10.47    31.69    28.01     0.01    3.23    0.71    3.98   0.13   0.04\r\ndm-1        0.00     0.00    0.00    0.94     0.01     3.78     8.00     0.33  345.84    0.04  346.81   0.01   0.00\r\ndm-2        0.00     0.00    0.09    0.07     1.35     0.36    22.50     0.00    2.55    0.23    5.62   1.78   0.03\r\n[...]\r\n^C\r\n<\/code><\/pre>\n
\u8fd9\u4e2a\u547d\u4ee4\u53ef\u4ee5\u5f04\u6e05\u5757\u8bbe\u5907\uff08\u78c1\u76d8\uff09\u7684\u72b6\u51b5\uff0c\u5305\u62ec\u5de5\u4f5c\u8d1f\u8f7d\u548c\u5904\u7406\u6027\u80fd\u3002\u6ce8\u610f\u4ee5\u4e0b\u5404\u9879\uff1a<\/p>\n
r\/s\uff0cw\/s\uff0crkB\/s\uff0cwkB\/s\uff1a\u5206\u522b\u8868\u793a\u6bcf\u79d2\u8bbe\u5907\u8bfb\u6b21\u6570\uff0c\u5199\u6b21\u6570\uff0c\u8bfb\u7684KB\u6570\uff0c\u5199\u7684KB\u6570\u3002\u5b83\u4eec\u63cf\u8ff0\u4e86\u78c1\u76d8\u7684\u5de5\u4f5c\u8d1f\u8f7d\u3002\u4e5f\u8bb8\u6027\u80fd\u95ee\u9898\u5c31\u662f\u7531\u8fc7\u9ad8\u7684\u8d1f\u8f7d\u6240\u9020\u6210\u7684\u3002<\/p>\n
await\uff1aI\/O\u5e73\u5747\u65f6\u95f4\uff0c\u4ee5\u6beb\u79d2\u4f5c\u5355\u4f4d\u3002\u5b83\u662f\u5e94\u7528\u4e2dI\/O\u5904\u7406\u6240\u5b9e\u9645\u6d88\u8017\u7684\u65f6\u95f4\uff0c\u56e0\u4e3a\u5176\u4e2d\u65e2\u5305\u62ec\u6392\u961f\u7528\u65f6\u4e5f\u5305\u62ec\u5904\u7406\u7528\u65f6\u3002\u5982\u679c\u5b83\u6bd4\u9884\u671f\u7684\u5927\uff0c\u5c31\u610f\u5473\u7740\u8bbe\u5907\u9971\u548c\u4e86\uff0c\u6216\u8005\u8bbe\u5907\u51fa\u4e86\u95ee\u9898\u3002<\/p>\n
avgqu-sz\uff1a\u5206\u914d\u7ed9\u8bbe\u5907\u7684\u5e73\u5747\u8bf7\u6c42\u6570\u3002\u5927\u4e8e1\u8868\u793a\u8bbe\u5907\u5df2\u7ecf\u9971\u548c\u4e86\u3002\uff08\u4e0d\u8fc7\u6709\u4e9b\u8bbe\u5907\u53ef\u4ee5\u5e76\u884c\u5904\u7406\u8bf7\u6c42\uff0c\u6bd4\u5982\u7531\u591a\u4e2a\u78c1\u76d8\u7ec4\u6210\u7684\u865a\u62df\u8bbe\u5907\uff09<\/p>\n
%util\uff1a\u8bbe\u5907\u4f7f\u7528\u7387\u3002\u8fd9\u4e2a\u503c\u663e\u793a\u4e86\u8bbe\u5907\u6bcf\u79d2\u5185\u5de5\u4f5c\u65f6\u95f4\u7684\u767e\u5206\u6bd4\uff0c\u4e00\u822c\u90fd\u5904\u4e8e\u9ad8\u4f4d\u3002\u4f4e\u4e8e60%\u901a\u5e38\u662f\u4f4e\u6027\u80fd\u7684\u8868\u73b0\uff08\u4e5f\u53ef\u4ee5\u4eceawait\u4e2d\u770b\u51fa\uff09\uff0c\u4e0d\u8fc7\u8fd9\u4e2a\u5f97\u770b\u8bbe\u5907\u7684\u7c7b\u578b\u3002\u63a5\u8fd1100%\u901a\u5e38\u610f\u5473\u7740\u9971\u548c\u3002<\/p>\n
\u5982\u679c\u67d0\u4e2a\u5b58\u50a8\u8bbe\u5907\u662f\u7531\u591a\u4e2a\u7269\u7406\u78c1\u76d8\u7ec4\u6210\u7684\u903b\u8f91\u78c1\u76d8\u8bbe\u5907\uff0c100%\u7684\u4f7f\u7528\u7387\u53ef\u80fd\u53ea\u662f\u610f\u5473\u7740I\/O\u5360\u7528<\/p>\n
\u8bf7\u7262\u8bb0\u4e8e\u5fc3\uff0cdisk I\/O\u6027\u80fd\u4f4e\u4e0d\u4e00\u5b9a\u662f\u4e2a\u95ee\u9898\u3002\u5e94\u7528\u7684I\/O\u5f80\u5f80\u662f\u5f02\u6b65\u7684\uff08\u6bd4\u5982\u9884\u8bfb\uff08read-ahead\uff09\u548c\u5199\u7f13\u51b2\uff08buffering for writes\uff09\uff09\uff0c\u6240\u4ee5\u4e0d\u4e00\u5b9a\u4f1a\u88ab\u963b\u585e\u5e76\u906d\u53d7\u5ef6\u8fdf\u3002<\/p>\n
7. free -m<\/h3>\n
$ free -m\r\n             total       used       free     shared    buffers     cached\r\nMem:        245998      24545     221453         83         59        541\r\n-\/+ buffers\/cache:      23944     222053\r\nSwap:            0          0          0\r\n<\/code><\/pre>\n
\u53f3\u8fb9\u7684\u4e24\u5217\u663e\u793a\uff1a
\nbuffers\uff1a\u7528\u4e8e\u5757\u8bbe\u5907I\/O\u7684\u7f13\u51b2\u533a\u7f13\u5b58
\ncached\uff1a\u7528\u4e8e\u6587\u4ef6\u7cfb\u7edf\u7684\u9875\u7f13\u5b58
\n\u5b83\u4eec\u7684\u503c\u63a5\u8fd1\u4e8e0\u65f6\uff0c\u5f80\u5f80\u5bfc\u81f4\u8f83\u9ad8\u7684\u78c1\u76d8I\/O\uff08\u53ef\u4ee5\u901a\u8fc7iostat\u786e\u8ba4\uff09\u548c\u7cdf\u7cd5\u7684\u6027\u80fd\u3002\u4e0a\u9762\u7684\u4f8b\u5b50\u91cc\u6ca1\u6709\u8fd9\u4e2a\u95ee\u9898\uff0c\u6bcf\u4e00\u5217\u90fd\u6709\u597d\u51e0M\u5462\u3002<\/p>\n
\u6bd4\u8d77\u7b2c\u4e00\u884c\uff0c-\/+ buffers\/cache<\/code>\u63d0\u4f9b\u7684\u5185\u5b58\u4f7f\u7528\u91cf\u4f1a\u66f4\u52a0\u51c6\u786e\u4e9b\u3002Linux\u4f1a\u628a\u6682\u65f6\u7528\u4e0d\u4e0a\u7684\u5185\u5b58\u7528\u4f5c\u7f13\u5b58\uff0c\u4e00\u65e6\u5e94\u7528\u9700\u8981\u7684\u65f6\u5019\u7acb\u523b\u91cd\u65b0\u5206\u914d\u7ed9\u5b83\u3002\u6240\u4ee5\u90e8\u5206\u88ab\u7528\u4f5c\u7f13\u5b58\u7684\u5185\u5b58\u5176\u5b9e\u4e5f\u7b97\u662f\u7a7a\u95f2\u5185\u5b58\uff0c\u7b2c\u4e8c\u884c\u4ee5\u6b64\u4fee\u8ba2\u4e86\u5b9e\u9645\u7684\u5185\u5b58\u4f7f\u7528\u91cf\u3002\u4e3a\u4e86\u89e3\u91ca\u8fd9\u4e00\u70b9\uff0c \u751a\u81f3\u6709\u4eba\u4e13\u95e8\u5efa\u4e86\u4e2a\u7f51\u7ad9\uff1a linuxatemyram<\/a>\u3002<\/p>\n
\u5982\u679c\u4f60\u5728Linux\u4e0a\u5b89\u88c5\u4e86ZFS\uff0c\u6b63\u5982\u6211\u4eec\u5728\u4e00\u4e9b\u670d\u52a1\u4e0a\u6240\u505a\u7684\uff0c\u8fd9\u4e00\u70b9\u4f1a\u53d8\u5f97\u66f4\u52a0\u8ff7\u60d1\uff0c\u56e0\u4e3aZFS\u5b83\u81ea\u5df1\u7684\u6587\u4ef6\u7cfb\u7edf\u7f13\u5b58\u4e0d\u7b97\u5165free -m<\/code>\u3002\u6709\u65f6\u7cfb\u7edf\u770b\u4e0a\u53bb\u5df2\u7ecf\u6ca1\u6709\u591a\u5c11\u7a7a\u95f2\u5185\u5b58\u53ef\u7528\u4e86\uff0c\u5176\u5b9e\u5185\u5b58\u90fd\u5f85\u5728ZFS\u7684\u7f13\u5b58\u91cc\u5462\u3002<\/p>\n
8. sar -n DEV 1<\/h3>\n
$ sar -n DEV 1\r\nLinux 3.13.0-49-generic (titanclusters-xxxxx)  07\/14\/2015     _x86_64_    (32 CPU)\r\n\r\n12:16:48 AM     IFACE   rxpck\/s   txpck\/s    rxkB\/s    txkB\/s   rxcmp\/s   txcmp\/s  rxmcst\/s   %ifutil\r\n12:16:49 AM      eth0  18763.00   5032.00  20686.42    478.30      0.00      0.00      0.00      0.00\r\n12:16:49 AM        lo     14.00     14.00      1.36      1.36      0.00      0.00      0.00      0.00\r\n12:16:49 AM   docker0      0.00      0.00      0.00      0.00      0.00      0.00      0.00      0.00\r\n\r\n12:16:49 AM     IFACE   rxpck\/s   txpck\/s    rxkB\/s    txkB\/s   rxcmp\/s   txcmp\/s  rxmcst\/s   %ifutil\r\n12:16:50 AM      eth0  19763.00   5101.00  21999.10    482.56      0.00      0.00      0.00      0.00\r\n12:16:50 AM        lo     20.00     20.00      3.25      3.25      0.00      0.00      0.00      0.00\r\n12:16:50 AM   docker0      0.00      0.00      0.00      0.00      0.00      0.00      0.00      0.00\r\n^C\r\n<\/code><\/pre>\n
\u8fd9\u4e2a\u547d\u4ee4\u53ef\u4ee5\u7528\u4e8e\u68c0\u67e5\u7f51\u7edc\u6d41\u91cf\u7684\u5de5\u4f5c\u8d1f\u8f7d\uff1arxkB\/s\u548ctxkB\/s\uff0c\u4ee5\u53ca\u5b83\u662f\u5426\u8fbe\u5230\u9650\u989d\u4e86\u3002\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0ceth0<\/code>\u63a5\u6536\u7684\u6d41\u91cf\u8fbe\u523022Mbytes\/s\uff0c\u4e5f\u5373176Mbits\/sec\uff08\u9650\u989d\u662f1Gbit\/sec\uff09<\/p>\n
\u6211\u4eec\u7528\u7684\u7248\u672c\u4e2d\u8fd8\u63d0\u4f9b\u4e86%ifutil<\/code>\u4f5c\u4e3a\u8bbe\u5907\u4f7f\u7528\u7387\uff08\u63a5\u6536\u548c\u53d1\u9001\u4e24\u8005\u4e2d\u7684\u6700\u5927\u503c\uff09\u7684\u6307\u6807\u3002\u6211\u4eec\u4e5f\u53ef\u4ee5\u7528Brendan\u7684nicstat<\/a>\u8ba1\u91cf\u8fd9\u4e2a\u503c\u3002\u4e00\u5982nicstat<\/code>\uff0csar<\/code>\u663e\u793a\u7684\u8fd9\u4e2a\u503c\u4e0d\u4e00\u5b9a\u662f\u5bf9\u7684\uff0c\u5728\u8fd9\u4e2a\u4f8b\u5b50\u91cc\u9762\u5c31\u6ca1\u80fd\u6b63\u5e38\u5de5\u4f5c\uff080.00\uff09\u3002<\/p>\n
9. sar -n TCP,ETCP 1<\/h3>\n
$ sar -n TCP,ETCP 1\r\nLinux 3.13.0-49-generic (titanclusters-xxxxx)  07\/14\/2015    _x86_64_    (32 CPU)\r\n\r\n12:17:19 AM  active\/s passive\/s    iseg\/s    oseg\/s\r\n12:17:20 AM      1.00      0.00  10233.00  18846.00\r\n\r\n12:17:19 AM  atmptf\/s  estres\/s retrans\/s isegerr\/s   orsts\/s\r\n12:17:20 AM      0.00      0.00      0.00      0.00      0.00\r\n\r\n12:17:20 AM  active\/s passive\/s    iseg\/s    oseg\/s\r\n12:17:21 AM      1.00      0.00   8359.00   6039.00\r\n\r\n12:17:20 AM  atmptf\/s  estres\/s retrans\/s isegerr\/s   orsts\/s\r\n12:17:21 AM      0.00      0.00      0.00      0.00      0.00\r\n^C\r\n<\/code><\/pre>\n
\u8fd9\u4e2a\u547d\u4ee4\u663e\u793a\u4e00\u4e9b\u5173\u952eTCP\u6307\u6807\u7684\u6c47\u603b\u3002\u5176\u4e2d\u5305\u62ec\uff1a
\nactive\/s\uff1a\u672c\u5730\u6bcf\u79d2\u521b\u5efa\u7684TCP\u8fde\u63a5\u6570\uff08\u6bd4\u5982concept()\u521b\u5efa\u7684\uff09
\npassive\/s\uff1a\u8fdc\u7a0b\u6bcf\u79d2\u521b\u5efa\u7684TCP\u8fde\u63a5\u6570\uff08\u6bd4\u5982accept()\u521b\u5efa\u7684\uff09
\nretrans\/s\uff1a\u6bcf\u79d2TCP\u91cd\u4f20\u6b21\u6570<\/p>\n
\u4e3b\u52a8\u8fde\u63a5\u6570\uff08active\uff09\u548c\u88ab\u52a8\u8fde\u63a5\u6570\uff08passive\uff09\u901a\u5e38\u53ef\u4ee5\u7528\u6765\u7c97\u7565\u5730\u63cf\u8ff0\u7cfb\u7edf\u8d1f\u8f7d\u3002\u53ef\u4ee5\u8ba4\u4e3a\u4e3b\u52a8\u8fde\u63a5\u662f\u5bf9\u5916\u7684\uff0c\u800c\u88ab\u52a8\u8fde\u63a5\u662f\u5bf9\u5185\u7684\uff0c\u867d\u7136\u4e25\u683c\u6765\u8bf4\u4e0d\u5b8c\u5168\u662f\u8fd9\u4e2a\u6837\u5b50\u3002\uff08\u6bd4\u5982\uff0c\u4e00\u4e2a\u4ecelocalhost\u5230localhost\u7684\u8fde\u63a5\uff09<\/p>\n
\u91cd\u4f20\u662f\u7f51\u7edc\u6216\u7cfb\u7edf\u95ee\u9898\u7684\u4e00\u4e2a\u4fe1\u53f7\uff1b\u5b83\u53ef\u80fd\u662f\u4e0d\u53ef\u9760\u7684\u7f51\u7edc\uff08\u6bd4\u5982\u516c\u7f51\uff09\u6240\u9020\u6210\u7684\uff0c\u4e5f\u6709\u53ef\u80fd\u662f\u670d\u52a1\u5668\u5df2\u7ecf\u8fc7\u8f7d\u5e76\u5f00\u59cb\u4e22\u5305\u3002\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u6bcf\u79d2\u53ea\u521b\u5efa\u4e00\u4e2a\u65b0\u7684TCP\u8fde\u63a5\u3002<\/p>\n
10. top<\/h3>\n
$ top\r\ntop - 00:15:40 up 21:56,  1 user,  load average: 31.09, 29.87, 29.92\r\nTasks: 871 total,   1 running, 868 sleeping,   0 stopped,   2 zombie\r\n%Cpu(s): 96.8 us,  0.4 sy,  0.0 ni,  2.7 id,  0.1 wa,  0.0 hi,  0.0 si,  0.0 st\r\nKiB Mem:  25190241+total, 24921688 used, 22698073+free,    60448 buffers\r\nKiB Swap:        0 total,        0 used,        0 free.   554208 cached Mem\r\n\r\n   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND\r\n 20248 root      20   0  0.227t 0.012t  18748 S  3090  5.2  29812:58 java\r\n  4213 root      20   0 2722544  64640  44232 S  23.5  0.0 233:35.37 mesos-slave\r\n 66128 titancl+  20   0   24344   2332   1172 R   1.0  0.0   0:00.07 top\r\n  5235 root      20   0 38.227g 547004  49996 S   0.7  0.2   2:02.74 java\r\n  4299 root      20   0 20.015g 2.682g  16836 S   0.3  1.1  33:14.42 java\r\n     1 root      20   0   33620   2920   1496 S   0.0  0.0   0:03.82 init\r\n     2 root      20   0       0      0      0 S   0.0  0.0   0:00.02 kthreadd\r\n     3 root      20   0       0      0      0 S   0.0  0.0   0:05.35 ksoftirqd\/0\r\n     5 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker\/0:0H\r\n     6 root      20   0       0      0      0 S   0.0  0.0   0:06.94 kworker\/u256:0\r\n     8 root      20   0       0      0      0 S   0.0  0.0   2:38.05 rcu_sched\r\n\r\n<\/code><\/pre>\n
top<\/code>\u547d\u4ee4\u5305\u62ec\u5f88\u591a\u6211\u4eec\u4e4b\u524d\u68c0\u67e5\u8fc7\u7684\u6307\u6807\u3002\u5b83\u9002\u5408\u7528\u6765\u67e5\u770b\u76f8\u6bd4\u4e8e\u4e4b\u524d\u7684\u547d\u4ee4\u8f93\u51fa\u7684\u7ed3\u679c\uff0c\u8d1f\u8f7d\u6709\u4e86\u54ea\u4e9b\u53d8\u52a8\u3002<\/p>\n
\u4e0d\u80fd\u6e05\u6670\u663e\u793a\u6570\u636e\u968f\u65f6\u95f4\u53d8\u52a8\u7684\u60c5\u51b5\uff0c\u8fd9\u662ftop<\/code>\u7684\u4e00\u4e2a\u7f3a\u70b9\u3002\u76f8\u8f83\u800c\u8a00\uff0cvmstat<\/code>\u548cpidstat<\/code>\u7684\u8f93\u51fa\u4e0d\u4f1a\u8986\u76d6\u6389\u4e4b\u524d\u7684\u7ed3\u679c\uff0c\u56e0\u6b64\u66f4\u9002\u5408\u67e5\u770b\u6570\u636e\u968f\u65f6\u95f4\u7684\u53d8\u52a8\u60c5\u51b5\u3002\u53e6\u5916\uff0c\u5982\u679c\u4f60\u4e0d\u80fd\u53ca\u65f6\u6682\u505ctop<\/code>\u7684\u8f93\u51fa\uff08Ctrl-s\u6682\u505c\uff0cCtrl-q\u7ee7\u7eed\uff09\uff0c\u4e5f\u8bb8\u67d0\u4e9b\u5173\u952e\u7ebf\u7d22\u4f1a\u6e6e\u706d\u5728\u65b0\u7684\u8f93\u51fa\u4e2d\u3002<\/p>\n
\u5728\u8fd9\u4e4b\u540e…<\/h2>\n
\u6709\u5f88\u591a\u5de5\u5177\u548c\u65b9\u6cd5\u8bba\u6709\u52a9\u4e8e\u4f60\u6df1\u5165\u5730\u53d1\u6398\u95ee\u9898\u3002Brendan\u57282015\u5e74Velocity\u5927\u4f1a\u4e0a\u7684Linux Performance Tools tutorial<\/a>\u4e2d\u5217\u51fa\u8d85\u8fc740\u4e2a\u547d\u4ee4\uff0c\u8986\u76d6\u4e86\u89c2\u6d4b\u3001\u57fa\u51c6\u6d4b\u8bd5\u3001\u8c03\u4f18\u3001\u9759\u6001\u6027\u80fd\u8c03\u4f18\u3001\u5206\u6790\uff08profile\uff09\uff0c\u548c\u8ffd\u8e2a\uff08tracing\uff09\u591a\u4e2a\u65b9\u9762\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
https:\/\/github.com\/spacewander\/blogWithM … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-279","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=\/wp\/v2\/posts\/279","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=279"}],"version-history":[{"count":1,"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=\/wp\/v2\/posts\/279\/revisions"}],"predecessor-version":[{"id":280,"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=\/wp\/v2\/posts\/279\/revisions\/280"}],"wp:attachment":[{"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=279"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=279"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chen-hongyi.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=279"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}