{"id":7393,"date":"2022-08-30T11:34:07","date_gmt":"2022-08-30T03:34:07","guid":{"rendered":"https:\/\/egonlin.com\/?p=7393"},"modified":"2022-10-18T17:34:00","modified_gmt":"2022-10-18T09:34:00","slug":"04-%e4%b8%8d%e5%8f%af%e4%b8%ad%e6%96%ad%e7%9d%a1%e7%9c%a0%e5%af%b9%e5%ae%b9%e5%99%a8%e7%9a%84%e5%bd%b1%e5%93%8d","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=7393","title":{"rendered":"04 \u4e0d\u53ef\u4e2d\u65ad\u7761\u7720\u5bf9\u5bb9\u5668\u7684\u5f71\u54cd"},"content":{"rendered":"

\u4e00\u3001\u91cd\u70b9\u77e5\u8bc6\u56de\u987e<\/h1>\n

\u50a8\u5907\u77e5\u8bc61\uff1alinux\u8fdb\u7a0b\u72b6\u6001<\/p>\n

\u4e00\u3001\u6b7b\u4e86\u7684\u8fdb\u7a0b\uff1a\n\u8fdb\u7a0b\u5728\u8c03\u7528 do_exit() \u9000\u51fa\u7684\u65f6\u5019\uff0c\u6709\u4e24\u4e2a\u72b6\u6001\n\uff081\uff09\u4e00\u4e2a\u662f \uff1aEXIT_DEAD\uff0c\u4e5f\u5c31\u662f\u8fdb\u7a0b\u5728\u771f\u6b63\u7ed3\u675f\u9000\u51fa\u7684\u90a3\u4e00\u77ac\u95f4\u7684\u72b6\u6001\uff1b\n\uff082\uff09\u53e6\u5916\u4e00\u4e2a\u662f\uff1aEXIT_ZOMBIE \u72b6\u6001\uff0c\u8fd9\u662f\u8fdb\u7a0b\u5728 EXIT_DEAD \u524d\u7684\u4e00\u4e2a\u72b6\u6001\uff0c\u5373\u50f5\u5c38\u8fdb\u7a0b\uff0c\n\n\u4e8c\u3001\u6d3b\u7740\u7684\u8fdb\u7a0b\n1\u3001\u8fd0\u884c\u7740\uff1a\u8fd0\u884c+\u5c31\u7eea\uff0c\u7edf\u79f0TASK_RUNNING\uff09\n\u8fd0\u884c\u7740\u7684\u8fdb\u7a0b\u5206\u4e3a\u4e24\u79cd\uff1a\u4e00\u79cd\u662f\u771f\u7684\u62ff\u5230cpu\u8d44\u6e90\u771f\u7684\u5728\u8fd0\u884c\uff0c\u53e6\u5916\u4e00\u79cd\u5c31\u662f\u5728\u8fd0\u884c\u961f\u5217\u91cc\u3001\u968f\u65f6\u53ef\u4ee5\u8fd0\u884c\uff0c\u5904\u4e8eR\u72b6\u6001\u7684\u8fdb\u7a0b\u6cdb\u6307\u8fd9\u4e24\u79cd\u60c5\u51b5\n2\u3001\u7761\u7720\u7740\uff1a\n\u7761\u7720\u7740\u662f\u6307\uff0c\u8fdb\u7a0b\u9700\u8981\u7b49\u5f85\u67d0\u79cd\u8d44\u6e90\u800c\u8fdb\u5165\u7684\u72b6\u6001\uff0c\u8981\u7b49\u7684\u8d44\u6e90\u53ef\u4ee5\u662f\u4e00\u4e2a\u4fe1\u53f7\u91cfSemaphore\uff09, \u6216\u8005\u662f\u78c1\u76d8 I\/O\uff0c\u8fd9\u4e2a\u72b6\u6001\u7684\u8fdb\u7a0b\u4f1a\u88ab\u653e\u5165\u5230 wait queue \u961f\u5217\u91cc\u3002\n\n\u7761\u7720\u7740\u7684\u8fdb\u7a0b\u5177\u4f53\u8fd8\u5305\u62ec\u4e24\u4e2a\u5b50\u72b6\u6001\uff1a\n\uff081\uff09\u4e00\u4e2a\u662f\u4e0d\u53ef\u88ab\u6253\u65ad\u7684\uff08TASK_UNINTERRUPTIBLE\uff09\uff0c\u7528 ps \u67e5\u770b\u8fdb\u7a0b\uff0c\u5c31\u663e\u793a\u4e3a D stat\u3002---\u300b\u6b63\u5728\u8fdb\u884c\u7684io\n\u4ec0\u4e48\u65f6\u5019\u8fdb\u7a0b\u4f1a\u5904\u4e8e\u4e0d\u53ef\u4e2d\u65ad\u7761\u7720\u72b6\u6001\uff0c\u4f8b\u5982\uff0c\u5f53\u4e00\u4e2a\u8fdb\u7a0b\u5411\u78c1\u76d8\u8bfb\u5199\u6570\u636e\u65f6\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u6570\u636e\u7684\u4e00\u81f4\u6027\uff0c\u5728\u5f97\u5230\u78c1\u76d8\u56de\u590d\u524d\uff0c\n\u5b83\u662f\u4e0d\u80fd\u88ab\u5176\u4ed6\u8fdb\u7a0b\u6216\u8005\u4e2d\u65ad\u6253\u65ad\u7684\uff0c\u8fd9\u4e2a\u65f6\u5019\u7684\u8fdb\u7a0b\u5c31\u5904\u4e8e\u4e0d\u53ef\u4e2d\u65ad\u72b6\u6001\u3002\u5982\u679c\u6b64\u65f6\u7684\u8fdb\u7a0b\u88ab\u6253\u65ad\u4e86\uff0c\u5c31\u5bb9\u6613\u51fa\u73b0\u78c1\u76d8\u6570\u636e\u4e0e\u8fdb\u7a0b\u6570\u636e\u4e0d\u4e00\u81f4\u7684\u95ee\u9898\u3002\n\u6240\u4ee5\uff0c\u4e0d\u53ef\u4e2d\u65ad\u72b6\u6001\u5b9e\u9645\u4e0a\u662f\u7cfb\u7edf\u5bf9\u8fdb\u7a0b\u548c\u786c\u4ef6\u8bbe\u5907\u7684\u4e00\u79cd\u4fdd\u62a4\u673a\u5236\n\n\uff082\uff09\u4e00\u4e2a\u662f\u53ef\u4ee5\u88ab\u6253\u65ad\u7684\uff08TASK_INTERRUPTIBLE\uff09\uff0c\u6211\u4eec\u7528 ps \u67e5\u770b\u5230\u7684\u8fdb\u7a0b\uff0c\u663e\u793a\u4e3a S stat\u3002--\u300b\u6b63\u5728\u7b49\u5f85\uff0c\n\u5c31\u597d\u6bd4\u662f\u4f60\u7f51\u8d2d\u5b8c\u4e1c\u897f\u540e\u4f60\u77e5\u9053\u4f1a\u6709\u5feb\u9012\u4f1a\u9001\u7ed9\u4f60\uff0c\u4f46\u662f\u4ec0\u4e48\u65f6\u5019\u9001\u4f60\u6839\u672c\u4e0d\u77e5\u9053\uff0c\u90a3\u4f60\u80af\u5b9a\u4e0d\u5fc5\u5728\u539f\u5730\u50bb\u7b49\u7740\n\n\u4e3e\u4f8b\uff1a\n\u6211\u4eec\u7684\u7a0b\u5e8f\u6709\u4e09\u884c\u4ee3\u7801\uff0c\u8fd0\u884c\u5230\u7b2c\u4e8c\u884c\u8981\u628a\u4e00\u4e2a\u89c6\u9891\u6587\u4ef6\u8bfb\u5165\u5185\u5b58\uff0c\u7b2c\u4e09\u884c\u624d\u80fd\u5904\u7406\uff0c\u6b64\u65f6\u56e0\u4e3a\u78c1\u76d8\u901f\u5ea6\u592a\u6162\u4e86\uff0c\u5bfc\u81f4io\u79ef\u538b\uff0c\n\u6bd4\u5982\u5728\u865a\u62df\u673a\u91cc\u538b\u7f29\u4e00\u4e2a\u5927\u6587\u4ef6\uff0c\u8be5\u538b\u7f29\u8fdb\u7a0b\u5c31\u6709\u53ef\u80fd\u8fdb\u5165D\u72b6\u6001\uff0c\u603b\u4e4bD\u4e0eS\u662f\u6709\u672c\u8d28\u533a\u522b\u7684\uff0cS\u72b6\u6001\u7c7b\u4f3cpython\u4e2dinput\u63a5\u6536\u8f93\u5165\u7684\u4ee3\u7801\uff0c\n\u4ee3\u8868\u7a0b\u5e8f\u7761\u7720\u963b\u585e\u4f4f\u4e86\uff0c\u4ec0\u4e48\u65f6\u5019\u6709\u5185\u5bb9\u8f93\u5165\u5e76\u4e0d\u77e5\u9053\uff0c\u800cD\u72b6\u6001\u4ee3\u8868\u660e\u786e\u6b63\u5728\u505aio\uff0c<\/code><\/pre>\n
\u50a8\u5907\u77e5\u8bc62\uff1a\u5173\u4e8ecpu\u7684\u4f7f\u7528\u60c5\u51b5\u6709\u4e24\u4e2a\u53c2\u8003\u6307\u6807<\/p>\n
1\u3001\u5173\u4e8ecpu\u4f7f\u7528\u7387\uff1a\n\u67d0\u4e2a\u7528\u6237\u8fdb\u7a0b\u5bf9cpu\u7684\u5229\u7528\u7387 = \u7528\u6237\u8fdb\u7a0b\u5360\u7528\u7684cpu\u65f6\u95f4\uff08\u5305\u62ec\u7528\u6237\u6001us+\u5185\u6838\u6001sy\uff09 \/ cpu\u7ecf\u5386\u7684\u8fd9\u6bb5\u603b\u65f6\u95f4\n\n\u8fdb\u7a0b\u5bf9cpu\u7684\u5229\u7528\u7387\u4e3a100%\u4ee3\u8868\u4f7f\u75281\u9897cpu\n\u8fdb\u7a0b\u5bf9cpu\u7684\u5229\u7528\u7387\u4e3a200%\u4ee3\u8868\u4f7f\u75282\u9897cpu\n\n\u5982\u679c\u5bbf\u4e3b\u673a\u53ea\u67094\u9897cpu\uff0c\u90a3\u4e48\u67d0\u4e2a\u8fdb\u7a0b\u5bf9cpu\u7684\u5229\u7528\u7387\u6700\u591a400%\n\n2\u3001\u5173\u4e8eload average\uff1a\n\u5728\u67d0\u6bb5\u65f6\u95f4\u5185\u5e73\u5747\u6d3b\u8dc3\u7684\u8fdb\u7a0b\u6570\uff08\u5305\u542b\u7cfb\u7edf\u5904\u4e8e\u53ef\u8fd0\u884c\u72b6\u6001\u4ee5\u53ca\u4e0d\u53ef\u4e2d\u65ad\u72b6\u6001\u7684\u5e73\u5747\u8fdb\u7a0b\u6570\uff09\n\n\u4e3a\u4f55\u4e0d\u53ef\u4e2d\u65ad\u7761\u7720\u4e5f\u5c5e\u4e8e\u6d3b\u8dc3\u7684\u8fdb\u7a0b\n    \u4e00\u4e2a\u8fdb\u7a0b\u5185\u8981\u505a\u7684\u4e8b\u53ef\u4ee5\u5206\u4e3a\u4e24\u5927\u7c7b\n    1\u3001\u8ba1\u7b97\u4efb\u52a1---\u300bcpu\u8d1f\u8d23\u8fd0\u884c\n    2\u3001io\u4efb\u52a1-----\u300b\u78c1\u76d8\u3001\u7f51\u5361\u8d1f\u8d23\u5904\u7406\n\n    \u53ea\u8981\u8be5\u8fdb\u7a0b\u6b63\u5728\u88ab\u5904\u7406\u7740\uff0c\u90a3\u5b83\u5c31\u5c5e\u4e8e\u6d3b\u8dc3\u7684\u8fdb\u7a0b\n    cpu\u5728\u6267\u884c\u8be5\u8fdb\u7a0b\u7684\u8ba1\u7b97\u673a\u4efb\u52a1\uff0c\u80af\u5b9a\u5c5e\u4e8e\u6d3b\u8dc3\n    \u78c1\u76d8\u5728\u5904\u7406\u8be5\u8fdb\u7a0b\u7684io\u4efb\u52a1\uff0c\u90a3\u80af\u5b9a\u4e5f\u5c5e\u4e8e\u6d3b\u8dc3\n    \u603b\u4e4b\u6709\u4e8b\u505a\u5c31\u5c5e\u4e8e\u6d3b\u8dc3\n\n    \u800cS\u72b6\u6001\uff0c\u5728\u7b49\u5f85\u7528\u6237\u8f93\u5165\u5185\u5bb9\uff0c\u800c\u6b64\u65f6\u7528\u6237\u4ec0\u4e48\u4e5f\u6ca1\u6709\u8f93\uff0c\u5373io\u64cd\u4f5c\u5565\u4e8b\u4e5f\u6ca1\u505a\uff0c\u8ba1\u7b97\u4efb\u52a1\u4e5f\u80af\u5b9a\u6ca1\u6709\n    \u6574\u4e2a\u8fdb\u7a0b\u5c31\u662f\u4e0d\u6d3b\u8dc3\u7684\n\n\u5982\u679c\u4f60\u7684\u7269\u7406\u673a\u67091\u9897cpu\uff0c\u90a3\u4e48\u6ee1\u8d1f\u8f7d\u4e3a1\uff0c\u4ee3\u8868\u53ef\u4ee5\u540c\u65f6\u8fd0\u884c1\u4e2a\u8fdb\u7a0b\uff0c\u8d85\u8fc71\u5c31\u4ee3\u8868\u8d85\u8f7d\uff0c\u5c0f\u4e8e1\u5c31\u4ee3\u8868\u7a7a\u95f2\n\n\u5982\u679c\u4f60\u7684\u7269\u7406\u673a\u67094\u9897cpu\uff0c\u90a3\u4e48\u6ee1\u8d1f\u8f7d\u4e3a4\uff0c\u4ee3\u8868\u53ef\u4ee5\u540c\u65f6\u8fd0\u884c4\u4e2a\u8fdb\u7a0b\uff0c\u8d85\u8fc74\u5219\u4ee3\u8868\u8d85\u8f7d\uff0c\u5c0f\u4e8e4\u5c31\u4ee3\u8868\u7a7a\u95f2\n\n\u4ee51\u9897cpu\u4e3a\u4f8b\uff0c\u5982\u679c\u5904\u7406\u5668\u4e0a\u6709\u4e00\u4e2aR\u7684\u8fdb\u7a0b\uff0c\u540c\u65f6\u5728\u7cfb\u7edf\u7684\u8fdb\u7a0b\u53ef\u8fd0\u884c\u961f\u5217\u91cc\u67099\u4e2a\u8fdb\u7a0b\uff0c\u90a3\u4e481\u5206\u949f\u7684load average=1+9\n\n\u5982\u679c\u5bbf\u4e3b\u673a\u67094\u9897cpu\uff0c\u90a3\u4e48\u5e73\u5747\u8d1f\u8d23\u662f\u53ef\u4ee5\u8d85\u8fc74\u7684\n\n3\u3001\u7ed3\u8bba\n\u6709\u53ef\u80fd\u4f1a\u51fa\u73b0\u5de5\u4f5c\u91cf\u5f88\u5927\uff0c\u4f46\u662f\u5229\u7528\u7387\u5f88\u4f4e\uff0c\u6bd4\u5982\u6bcf\u4e2a\u5458\u5de5\u624b\u91cc\u90fd\u6709\u5f88\u591a\u6d3b\u8981\u505a\uff0c\u4f46\u5b9e\u9645\u4e0a\u4f60\u95ee\u95ee\u6bcf\u4e2a\u6d3b\u7684\u8fdb\u5ea6\u662f\u5565\u5927\u5bb6\u90fd\u544a\u8bc9\u8fd9\u4e9b\u6d3b\u90fd\u5728\u8fdb\u884c\u7740\uff0c\u4f46\u662f\u90fd\u5904\u4e8e\n\u7b49\u5f85\u7684\u72b6\u6001\uff0c\u90a3\u6012\u4e86\uff0c\u4f60\u50bb\u554a\uff0c\u7b49\u5f85\u7684\u8fc7\u7a0b\u4f60\u4e0d\u4f1a\u5e72\u522b\u7684\u4e8b\u554a\uff0c\u5458\u5de5\u4e5f\u5f88\u51a4\u6789\uff0c\u8bf4\u4e0d\u884c\u554a\u8001\u677f\uff0c\u6211\u8fd9\u4e2aio\u662f\u4e0d\u53ef\u4e2d\u65ad\u7684io\uff0c\u4e0d\u80fd\u88ab\u4e2d\u65ad\n\u5fc5\u987b\u7b49\u7740\u5bf9\u65b9\u9001\u8fc7\u6765\u6570\u636e\u624d\u884c\uff0c\u4f60\u522b\u770b\u6211\u5f88\u95f2\uff0c\u4f46\u662f\u8fd9\u4ef6\u4e8b\u786e\u5b9e\u662f\u6b63\u5728\u8fdb\u884c\u7684\u4e8b\u60c5\n<\/code><\/pre>\n
\u4e8c\u3001\u5f15\u5165\u4eca\u65e5\u95ee\u9898<\/h1>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528cpu cgroup\u5bf9\u5bb9\u5668\u7684cpu\u8d44\u6e90\u8fdb\u884c\u9650\u5236\uff0c\u4f46\u662fcpu cgroup\u5e76\u975e\u662f\u4e07\u80fd\u7684\uff0c\u5b83\u65e0\u6cd5\u9650\u5236Load Average\uff0c\u6ca1\u6709\u8fd9\u4e2a\u9650\u5236\uff0c\u4f1a\u5f71\u54cd\u6211\u4eec\u5bf9\u8d44\u6e90\u7684\u5408\u7406\u8c03\u5ea6\uff0c\u8fdb\u800c\u5bfc\u81f4\u7cfb\u7edf\u53d8\u5f97\u5f88\u6162<\/p>\n
\u4f8b\u5982\uff1a<\/p>\n
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\n\u5176\u5b9e\u8fd9\u4e0elinux\u7cfb\u7edf\u7684Load Average\u7684\u7edf\u8ba1\u65b9\u5f0f\u6709\u5173
\n\u5728linux\u64cd\u4f5c\u7cfb\u7edf\u4e2d\uff0cLoad Average\u628a\u4e0d\u53ef\u4e2d\u65ad\u7761\u7720\u72b6\u6001\u7684\u8fdb\u7a0b\u4e5f\u5f53\u6210\u662f\u6d3b\u8dc3\u7684\u8fdb\u7a0b\uff0c\u5e76\u8ba1\u7b97\u5230\u4e86Load Average\u91cc
\n\u6240\u4ee5\u5982\u679c\u7cfb\u7edf\u4e2d\u6709\u5927\u91cf\u8fdb\u7a0b\u5904\u4e8eD\u72b6\u6001\uff0c\u4f1a\u5bfc\u81f4Load Average\u589e\u9ad8\uff0c\u800cD\u72b6\u6001\u4f5c\u4e3a\u4e00\u79cd\u7761\u7720\u72b6\u6001\u662f\u4e0d\u4f1a\u6d88\u8017cpu\u7684\uff0c\u6240\u4ee5cpu\u5229\u7528\u7387\u4f1a\u5f88\u4f4e<\/p>\n
\u95ee\u9898\u5c55\u793a<\/p>\n
\u5148\u6765\u67e5\u770b\u4e00\u4e0b\u521d\u59cb\u7684load average\uff0ccpu\u7684\u5269\u4f59\u5f88\u5145\u8db3\uff0cload average\u4e5f\u4e0d\u9ad8<\/p>\n
\"\"<\/div><\/p>\n
\u7136\u540e\u6211\u6765\u6a21\u62df\u4e00\u4e0b\uff0ccpu idle\u5269\u4f59\u7387\u5f88\u591a\u3001cpu\u5f88\u5145\u8db3\uff0c\u4f46\u662fload average\u975e\u5e38\u9ad8<\/p>\n
linux\u7cfb\u7edf\u4e2d\u4e5f\u5b58\u5728\u5bb9\u6613\u6355\u6349\u7684TASK_UNINTERRUPTIBLE\u72b6\u6001\u3002\n\u6267\u884cvfork\u7cfb\u7edf\u8c03\u7528\u540e\uff0c\u7236\u8fdb\u7a0b\u5c06\u8fdbTASK_UNINTERRUPTIBLE\u72b6\u6001\uff0c\n\u76f4\u5230\u5b50\u8fdb\u7a0b\u8c03\u7528exit\u6216exec \u901a\u8fc7\u4e0b\u9762\u7684\u4ee3\u7801\u5c31\u80fd\u5f97\u5230\u5904\u4e8eTASK_UNINTERRUPTIBLE\u72b6\u6001\u7684\u8fdb\u7a0b\uff1a\n\n[root@test04 ~]# cat test.c \nvoid main() {  \nif (!vfork()) while (1) {sleep(1);};  \n}\n[root@test04 ~]# gcc -o test test.c \n\n[root@test04 ~]# for i in `seq 1 100`;do (.\/test &) ;done  # \u542f\u52a8100\u4e2aD\u72b6\u6001\u7684\u8fdb\u7a0b<\/code><\/pre>\n
\u8ba9\u5b50\u5f39\u98de\u4e00\u4f1a\u4e4b\u540e\uff0c\u518d\u6b21\u67e5\u770b\u4f60\u4f1a\u53d1\u73b0cpu\u5269\u4f59\u7387\u91cf\u5927\u5f88\u5145\u8db3\uff0c\u4f46\u662f\u5e73\u5747\u8d1f\u8f7d\u5374\u5f88\u9ad8<\/p>\n
\"\"<\/div><\/p>\n
\u63a5\u4e0b\u6765\u95ee\u9898\u5c31\u6765<\/p>\n
1\u3001\u6211\u4eec\u67e5\u770b\u4e00\u4e2acpu\u7684\u4f7f\u7528\u60c5\u51b5\uff0c\u5230\u5e95\u662f\u4ee5cpu usage\u4e3a\u51c6\uff0c\u8fd8\u662f\u4ee5load average\u4e3a\u51c6\u5462\uff1f<\/p>\n
2\u3001D\u72b6\u6001\u7684\u8fdb\u7a0b\u4e3a\u4f55\u4f1a\u5bfc\u81f4load average\u5347\u9ad8\u5462\uff1f<\/p>\n
\u4e09\u3001Load Average\u7684\u7edf\u8ba1\u65b9\u5f0f<\/h1>\n
top\u547d\u4ee4\u53ef\u4ee5\u770b\u5230load average\uff0c\u5206\u522b\u5bf9\u5e941\u5206\u949f\u30015\u5206\u949f\u300115\u5206\u949f\u7684cpu\u5e73\u5747\u8d1f\u8f7d<\/p>\n
\"\"<\/div><\/p>\n
\u4e3a\u4f55linux\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u628a\u4e0d\u53ef\u4e2d\u65ad\u7761\u7720\u4e5f\u8ba1\u7b97\u5230Load Average\u91cc
\n——————–\u300b\u7b54\u6848
\nlinux\u8d77\u6e90\u4e8eunix\uff0c\u65e9\u5728unix\u7cfb\u7edf\u91cc\uff0c\u5c31\u6709load average\u7684\u6982\u5ff5\u4e86\uff0c\u4f46\u662f\u5728unix\u7cfb\u7edf\u91cc\u6ca1\u6709\u628a\u4e0d\u53ef\u4e2d\u65ad\u7761\u7720D\u72b6\u6001\u7684\u8fdb\u7a0b\u6570\u8ba1\u7b97\u5230Load Average\u91cc\uff0c\u800c\u5728linux\u7cfb\u7edf\u91cc\u5374\u628a\u4e0d\u53ef\u4e2d\u65ad\u7761\u7720D\u72b6\u6001\u7684\u8fdb\u7a0b\u6570\u8ba1\u7b97\u5230Load Average\u91cc\u4e86<\/p>\n
    \n
  • \n
    1\u3001\u5728\u5927\u591a\u6570unix\u53d1\u884c\u7248\u91cc\uff1a
    \nload average = \u6b63\u5728\u8fd0\u884c\u7684\u8fdb\u7a0b\u6570 + \u5904\u4e8e\u5c31\u7eea\u7684\u8fdb\u7a0b\u6570\uff08\u5373\u5df2\u7ecf\u5b58\u5728\u4e8e\u64cd\u4f5c\u7cfb\u7edf\u7684\u8fdb\u7a0b\u53ef\u8fd0\u884c\u961f\u5217\u91cc\uff0c\u53ea\u8981\u7533\u8bf7\u5230cpu\u8d44\u6e90\u5373\u53ef\u6295\u5165\u8fd0\u884c\u7684\u8fdb\u7a0b)<\/p>\n<\/li>\n
  • \n
    2\u3001\u800c\u5728linux\u7cfb\u7edf\u91cc\uff1a
    \nload average=\u6b63\u5728\u8fd0\u884c\u7684\u8fdb\u7a0b\u6570 +  \u5904\u4e8e\u5c31\u7eea\u7684\u8fdb\u7a0b\u6570 + \u4f11\u7720\u961f\u5217\u4e2d\u5904\u4e8e\u4e0d\u53ef\u4e2d\u65ad\u7761\u7720D\u72b6\u6001\u7684\u8fdb\u7a0b\u6570<\/p>\n<\/li>\n<\/ul>\n
    linux\u7cfb\u7edf\u4e3a\u4f55\u8981\u8fd9\u4e48\u505a\u5462\uff1f\uff1f\uff1f
    \n\u8981\u89e3\u7b54\u8fd9\u4e2a\u7591\u95ee\uff0c\u4f60\u5fc5\u987b\u8981\u641e\u660e\u767dLoad Average\u8fd9\u4e2a\u6307\u6807\u5230\u5e95\u8981\u53cd\u5e94\u4ec0\u4e48\uff1f<\/p>\n
    \u6253\u4e2a\u6bd4\u65b9\uff0c
    \n\u4e3a\u4e86\u601d\u8003\u65b9\u4fbf\uff0c\u5148\u5047\u8bbe\u4f60\u7684\u673a\u5668\u5c31\u4e00\u4e2acpu<\/p>\n
      \n
    • \u4e00\u4e2a\u8fdb\u7a0b\u90fd\u662f\u5411\u524d\u884c\u8fdb\u7684\u4e00\u8f86\u8f66<\/li>\n
    • \u65e2\u7136\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u88ab\u6bd4\u55bb\u4e3a\u4e00\u8f86\u5f80\u524d\u884c\u8fdb\u7684\u8f66\uff0c\u90a3\u8d1f\u8d23\u8fd0\u884c\uff08\u6216\u8005\u8bf4\u627f\u8f7d\uff09\u8fdb\u7a0b\u7684cpu\u5c31\u76f8\u5f53\u4e8e\u4e00\u6761\u5355\u884c\u8f66\u9053\uff08\u540c\u4e00\u65f6\u95f4\u53ea\u5141\u8bb8\u901a\u884c\u4e00\u8f86\u8f66\uff09<\/li>\n
    • \u800cload average\u53cd\u5e94\u7684\u5c31\u662f\u6574\u4e2a\u7cfb\u7edf\u7684\u4ea4\u901a\u60c5\u51b5\uff0c\u5177\u4f53\u662f\u6307\u6240\u6709\u6761\u8def\u7684\u5355\u4f4d\u65f6\u95f4\u901a\u8fc7\u7684\u8f66\u8f86\u6570\uff08\u5373\u6d3b\u8dc3\u7684\u8fdb\u7a0b\u6570\uff09<\/li>\n
    • D\u72b6\u6001\u7684\u8fdb\u7a0b\u5c31\u597d\u6bd4\u662f\u8f66\u8f86\u5728\u7b49\u5f85\u7ea2\u706f\uff0c\u800c\u4e14\u662f\u4e0d\u53ef\u4e2d\u65ad\u7684\u7b49\uff0c\u6beb\u65e0\u7591\u95ee\u8fd9\u8f86\u8f66\u5e94\u8be5\u88ab\u8ba4\u4e3a\u662f\u5904\u4e8e\u6d3b\u8dc3\u72b6\u6001\uff0c\u5904\u4e8eD\u72b6\u6001\uff0c\u867d\u7136\u4e0d\u6d88\u8017cpu\u3001\u4e0d\u4f1a\u7edf\u8ba1\u5230cpu\u5360\u7528\u7387\u91cc\uff0c\u4f46\u662f\u5b83\u4e00\u5b9a\u662f\u6d3b\u8dc3\u7684\u8fdb\u7a0b<\/li>\n
    • S\u72b6\u6001\u7684\u8fdb\u7a0b\u5c31\u597d\u6bd4\u662f\u8f66\u8f86\u505c\u5728\u4f60\u52a0\u8f66\u5e93\u91cc\u5462<\/li>\n<\/ul>\n
      \u4f60\u4ed4\u7ec6\u601d\u8003\u4e00\u4e0b\uff0c\u5982\u679c\u6211\u4eec\u8981\u53cd\u5e94\u8def\u51b5\u60c5\u51b5\uff0c\u80af\u5b9a\u662f\u9700\u8981\u628a\u7b49\u5f85\u7ea2\u706f\u7684\u60c5\u51b5\u5373D\u72b6\u6001\u4e5f\u8003\u8651\u8fdb\u53bb\uff0c\u8fd9\u79cd\u7edf\u8ba1\u66f4\u4e3a\u79d1\u5b66\uff0c\u4e00\u6761\u8def\u7684\u8def\u51b5\u80af\u5b9a\u662f\u9700\u8981\u8003\u8651\u7ea2\u7eff\u706f\u60c5\u51b5\u7684\uff0c\u60f3\u60f3\u5c31\u660e\u767d\u4e86\uff0c\u54ea\u6015\u6709\u4e00\u6761\u8def\u5f88\u7a7a\uff08cpu\u5229\u7528\u7387\u5f88\u4f4e\uff09\uff0c\u4f46\u662f\u7ea2\u7eff\u7279\u522b\u591a\uff0c\u6c7d\u8f66\u4e5f\u9700\u8981\u6392\u961f\uff0c\u4e0d\u53ef\u80fd\u5f00\u5feb\u3002\u5982\u679c\u8fd9\u8f86\u8f66\u662f\u51fa\u79df\u8f66\u4f60\u4f5c\u4e3a\u5ba2\u6237\u5750\u5728\u8f66\u91cc\u7684\u76f4\u89c2\u611f\u53d7\u5c31\u662f\u8f66\u5f00\u7684\u5f88\u6162<\/p>\n
      \u6240\u4ee5\u8bf4Load Average\u53cd\u5e94\u7684\u662f\u6574\u4e2a\u7cfb\u7edf\u7684\u4efb\u52a1\u91cf\/\u8d1f\u8f7d\u91cf\u60c5\u51b5
      \n\u800ccpu\u5229\u7528\u7387\u53cd\u5e94\u7684\u5219\u662f\u6bcf\u4e2acpu\u7684\u5229\u7528\u60c5\u51b5<\/p>\n
      \u5982\u679c\u6211\u4eec\u628a\u6574\u4e2a\u7cfb\u7edf\u6bd4\u55bb\u4e3a\u4e00\u5bb6\u516c\u53f8\uff0cload average\u53cd\u5e94\u7684\u5c31\u662f\u8fd9\u5bb6\u516c\u53f8\u7684\u529e\u4e8b\u6548\u7387\uff0c\u800ccpu\u53cd\u5e94\u7684\u5c31\u662f\u6bcf\u4e2a\u5458\u5de5\u7684\u5077\u61d2\u7a0b\u5ea6\uff0c\u6b63\u5e38\u60c5\u51b5\u662f\uff0c\u6bcf\u4e2a\u5458\u5de5\u7684\u5077\u61d2\u5f88\u5c11\u3001\u5229\u7528\u7387\u9ad8\uff0c\u540c\u65f6\u8fd9\u5bb6\u516c\u53f8\u7684\u529e\u4e8b\u6548\u7387\u4e5f\u9ad8
      \n\u4e0d\u6b63\u5e38\u60c5\u51b5\u662f\uff0c\u5728\u5f00\u6708\u5e95\u603b\u7ed3\u5927\u4f1a\u7684\u65f6\u5019\uff0c\u8001\u677f\u53d1\u73b0\u516c\u53f8\u6b63\u5728\u529e\u7684\u4e8b\u5f88\u591a\uff0c\u4f46\u662f\u6bcf\u4e2a\u5458\u5de5\u90fd\u5f88\u95f2\uff0c\u6b64\u65f6\u53ef\u80fd\u7684\u539f\u56e0\u5c31\u662f\u5927\u91cf\u7684\u4e8b\u60c5\u90fd\u5904\u4e8e\u4e0d\u53ef\u4e2d\u65ad\u7684\u7b49\u5f85\u8fc7\u7a0b\u4e2d\uff0c\u8fd9\u662f\u9700\u8981\u4f18\u5316\u7684\uff0c\u4e0d\u7136\u54ea\u6015\u8fd9\u5bb6\u516c\u53f8\u6bcf\u5458\u5de5\u7684\u80fd\u529b\u90fd\u662f\u8d85\u4ebapro\uff0c\u90a3\u8fd9\u5bb6\u516c\u53f8\u7684\u6574\u4f53\u8fd0\u4f5c\u6548\u7387\u4e5f\u4e0d\u9ad8<\/p>\n
      \u7efc\u4e0a\uff0c\u5982\u679c IO \u8bbe\u5907\u51fa\u73b0\u74f6\u9888\uff0c\u52bf\u5fc5\u4f1a\u9020\u6210\u5927\u91cf\u7684\u8fdb\u7a0b\u5904\u4e8e\u7b49\u5f85 IO \u7684\u72b6\u6001\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u867d\u7136\u4e0d\u5173 CPU \u4ec0\u4e48\u4e8b\uff0c\u6574\u4e2a\u7cfb\u7edf\u7684\u5904\u7406\u80fd\u529b\u5176\u5b9e\u5df2\u7ecf\u51fa\u73b0\u7684\u5f88\u5927\u7684\u74f6\u9888\uff0c
      \n\u6240\u4ee5\u628a D \u72b6\u6001\u7684\u8fdb\u7a0b\u7b97\u5728\u5e73\u5747\u8d1f\u8f7d\u91cc\u4e5f\u8fd8\u7b97\u5408\u7406\u3002\u5f53\u7cfb\u7edf load average \u6bd4\u8f83\u9ad8\u65f6\uff0c\u9996\u5148\u6211\u4eec\u9700\u8981\u53bb\u7504\u522b\uff0c\u5230\u5e95\u662f CPU \u7684\u95ee\u9898\u8fd8\u662f IO \u7684\u95ee\u9898\u3002<\/p>\n
      \u67094\u9897cpu\uff0c\u6ee1\u8d1f\u8f7d\u4efb\u52a1\u6570\u5c31\u4e3a4\uff0c\u8d85\u4e86\u5c31\u8981\u5206\u6790\u539f\u56e0\u4e86\uff0c\u770b\u770b\u662f\u5426\u662fD\u72b6\u6001\u5e26\u6765\u7684\u5f71\u54cd\u3002<\/p>\n
      \u56e0\u4e3a\u5f53D\u72b6\u6001\u8fc7\u591a\uff0c\u5c31\u53ef\u80fd\u7a0b\u5e8f\u51fa\u4e00\u79cd\u6548\u679c\uff1a\u6240\u6709\u8fdb\u7a0b\u7684cpu\u5360\u7528\u7387\u975e\u5e38\u4f4e\uff0c\u4f46\u662fcpu\u76841\u5206\u949f5\u5206\u949f15\u5206\u949f\u8d1f\u8f7d\u975e\u5e38\u9ad8\uff0c\u8fd9\u4e2a\u4f1a\u5f71\u54cdk8s\u7684\u8c03\u5ea6<\/p>\n
      \u793a\u4f8b\uff1a\u5728\u7cfb\u7edf\u6ca1\u6709\u5927\u91cf\u7684D\u72b6\u6001\u8fdb\u7a0b\u65f6\uff0clinux\u7cfb\u7edf\u7684load average\u7684\u589e\u957f\u4e0ecpu\u5229\u7528\u7387\u8d8b\u4e8e\u4e00\u81f4<\/p>\n
      [root@test04 ~]# cat libdead_loop.c \nvoid DeadLoop() {\n     while (1) {\n         ; \n     }\n} \n[root@test04 ~]# gcc libdead_loop.c -fPIC -shared -o \/opt\/libdead_loop.so\n[root@test04 ~]# cat test.py \n#coding:utf-8\nfrom ctypes import cdll\nfrom threading import Thread\nimport sys\n\nif __name__ == "__main__":\n    if not (len(sys.argv) == 2 and sys.argv[1].isdigit()):\n        print("Usage: python xxx.py cpu\u4e2a\u6570")\n        exit()\n\n    num = int(sys.argv[1])\n    lib = cdll.LoadLibrary("\/opt\/libdead_loop.so")\n    for i in range(num):\n        Thread(target=lib.DeadLoop).start()\n\n[root@test04 ~]# python test.py 2 &\n[1] 67657\n<\/code><\/pre>\n
      \u6211\u4eec\u542f\u52a8\u4e00\u4e2a\u5360\u75282\u9897cpu\u7684\u7684\u8fdb\u7a0b\uff0c\u4f1a\u53d1\u73b0\u4e00\u5206\u949f\u8d1f\u8d23\u4e3a2.08\u4e0e\u6211\u4eec\u7684cpu usage\u543b\u5408\uff0c\u6b64\u5916\u6211\u4eec\u67094\u9897cpu\uff0c\u4f60\u5360\u75282\u9897\uff0c\u6240\u4ee5\u603b\u4f7f\u7528\u7387\u4e3a50%<\/p>\n
      \"\"<\/div><\/p>\n
      \u4f46\u5982\u679c\u6211\u4eec\u542f\u52a8\u4e86\u5927\u91cf\u7684D\u8fdb\u7a0b\uff0cload average\u4fbf\u4e0d\u4f1a\u4e0ecpu usage\u4e00\u81f4\uff0c\u800c\u662f\u4f1a\u8d85\u8fc7\u5b83<\/p>\n
      \u56db\u3001D\u72b6\u6001\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u5206\u6790<\/h1>\n
      <\/p>
      <\/div>
      \u67e5\u770b\u66f4\u591a<\/h2>
      \u8054\u7cfb\u7ba1\u7406\u5458\u5fae\u4fe1tutu19192010\uff0c\u6ce8\u518c\u8d26\u53f7<\/p>\n<\/div>
      <\/div>
      <\/td><\/tr>
      <\/td><\/tr><\/tbody><\/table>
      		<\/td><\/tr><\/tbody><\/table><\/form>
      Register<\/a><\/div>
      Forgotten username or password?<\/a><\/div>
      <\/div><\/div><\/div>
      <\/div>","protected":false},"excerpt":{"rendered":"
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