{"id":121,"date":"2020-12-14T17:04:47","date_gmt":"2020-12-14T09:04:47","guid":{"rendered":"https:\/\/dulizao.com\/?p=121"},"modified":"2020-12-14T17:04:47","modified_gmt":"2020-12-14T09:04:47","slug":"golang%e4%b8%adselect%e7%94%a8%e6%b3%95%e5%af%bc%e8%87%b4cpu%e5%8d%a0%e7%94%a8100%e7%9a%84%e9%97%ae%e9%a2%98%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"https:\/\/dulizao.com\/index.php\/2020\/12\/14\/golang%e4%b8%adselect%e7%94%a8%e6%b3%95%e5%af%bc%e8%87%b4cpu%e5%8d%a0%e7%94%a8100%e7%9a%84%e9%97%ae%e9%a2%98%e5%88%86%e6%9e%90\/","title":{"rendered":"Golang\u4e2dselect\u7528\u6cd5\u5bfc\u81f4CPU\u5360\u7528100%\u7684\u95ee\u9898\u5206\u6790"},"content":{"rendered":"\n
for{\n   select {\n      case i := <-chan:\n         \/\/\/\/\/\/code\n      \/\/default: \u203b \u5904\u7406\u529e\u6cd5\u662f\u6ce8\u91ca\u6389defualt\u9009\u9879\uff0c\u8ba9\u7a0b\u5e8f\u5904\u4e8e\u88ab\u963b\u585e\u72b6\u6001\uff0c\u800c\u4e0d\u662f\u6b7b\u5faa\u73af\u72b6\u6001 \u6b7b\u5faa\u73af\u72b6\u6001\u4f1a\u8ba9cpu\u5360\u7528100%\uff01\n   }\n}<\/pre>\n\n\n\n
\u5b9e\u73b0\u529f\u80fd<\/h2>\n\n\n\n
\u901a\u8fc7\u64cd\u4f5cchan\u6765\u5b9e\u73b0\u6d88\u8d39\u8005\u903b\u8f91\u3002<\/p>\n\n\n\n
\u95ee\u9898\u73b0\u8c61<\/h2>\n\n\n\n
\u4f46\u5728\u8fd0\u884c\u7684\u65f6\u5019\uff0c\u5373\u53d1\u73b0CPU\u5360\u7528\u7387100%\uff0c\u4e0b\u9762\u6211\u4eec\u5206\u6790\u4e00\u4e0b\u4ec0\u4e48\u539f\u56e0\u5f15\u8d77\u7684\u3002<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u95ee\u9898\u5206\u6790<\/h2>\n\n\n\n
\u7a0b\u5e8f\u8fd0\u884c\u65f6\uff0c\u5148\u4f7f\u7528go\u5173\u952e\u5b57\u521b\u5efa\u4e00\u4e2a goroutine\uff0c\u91cc\u9762\u662f\u4e00\u4e2afor\u5faa\u73af\u8bed\u53e5\u3002for\u8bed\u53e5\u91cc\u9762\u901a\u8fc7select{}\u6765\u76d1\u542c\u662f\u5426\u6709chan\u7684IO\u64cd\u4f5c\uff0c\u5f53ch\u4e2d\u6709\u53ef\u4ee5\u8bfb\u53d6\u7684\u6570\u636e\u65f6\uff0c\u5219\u5c06\u503c\u6253\u5370\u51fa\u6765\u3002\u6ca1\u6709\u7684\u8bdd\u5219\u6267\u884cdefault\u8bed\u53e5\uff0c\u800c\u8fd9\u91ccdefault\u8bed\u53e5\u4e3a\u7a7a\uff0c\u6240\u4ee5\u7ee7\u7eed\u4e0b\u4e00\u6b21for\u8bed\u53e5\uff0cfor{}\u662f\u4e00\u4e2a\u6b7b\u5faa\u73af\u8bed\u53e5\u3002<\/p>\n\n\n\n
\u5f53\u8bfb\u53d615\u6b21ch\u540e\uff0c\u7531\u4e8ech\u4f1a\u6c38\u8fdc\u5904\u4e8e\u963b\u585e\u72b6\u6001\uff0c\u6240\u4ee5\u4f1a\u4e00\u76f4\u6267\u884cdefault\u6761\u4ef6\uff0c\u7136\u540e\u518d\u6267\u884cfor\u5faa\u73af\u3002\u6b64\u65f6\u8fd9\u6bb5\u903b\u8f91\u57fa\u672c\u6f14\u53d8\u6210\u4e86\u4e00\u4e2a\u7a7a\u7684 for{} \u8bed\u53e5\uff0c\u6240\u4ee5\u4f1a\u5bfc\u81f4CPU\u5360\u7528100%\u3002<\/p>\n\n\n\n
\u89e3\u51b3\u529e\u6cd5<\/h2>\n\n\n\n
\u65e2\u7136\u6211\u4eec\u77e5\u9053\u8fd9\u4e2agoroutine\u4f1a\u4e00\u76f4\u5728\u6b7b\u5faa\u73af\u7684\u6267\u884c\u7a7a\u7684\u8bed\u53e5\uff0c\u5bfc\u81f4\u4e00\u76f4\u5360\u7528\u7740cpu\u4e0d\u653e\uff0c\u6211\u4eec\u53ea\u9700\u8981\u8ba9\u5f53\u524dgoroutine\u51fa\u8ba9CPU\u63a7\u5236\u6743\u7ed9\u5176\u5b83goroutine\u5373\u53ef\u3002\u6839\u636eGPM\u8c03\u5ea6\u539f\u7406<\/a>\uff0c\u8fd9\u91cc\u6211\u4eec\u53ea\u9700\u8981\u8ba9\u64cd\u4f5cchan\u7684IO\u8bed\u53e5\u8fdb\u884c\u963b\u585e\u5373\u53ef\uff0c\u8fd9\u6837Go Seched \u5c31\u4f1a\u53d1\u73b0goroutine\u53d1\u751f\u963b\u585e\uff0c\u4e8e\u662f\u5c06\u5f53\u524dG\u5207\u6362\u51fa\u53bb\uff0c\u91cd\u65b0\u8c03\u5ea6\u4e00\u4e2a\u65b0\u7684G\u8fc7\u6765\uff0c\u5f00\u59cb\u4e00\u4e2a\u65b0\u7684GPM\u5173\u7cfb\u7ee7\u7eed\u8fd0\u884c\u3002
\u8fd9\u91cc\u6700\u7b80\u5355\u7684\u5b9e\u73b0\u65b9\u6cd5\u5c31\u6ce8\u91ca\u6389 default<\/strong> \u8bed\u53e5\u5373\u53ef\u3002\u5c06\u5f53\u524dgoroutine\u6b7b\u5faa\u73af\u72b6\u6001\u53d8\u6210\u963b\u585e\u72b6\u6001\u3002<\/p>\n\n\n\n
\u6ce8\u610f\u8fd9\u91cc\u7684\u963b\u585e\u548c\u6267\u884c\u7a7a\u7684 default\u662f\u4e24\u7801\u4e8b\uff0c\u963b\u585e\u662f\u6267\u884c\u5230\u8fd9\u91cc\u4e3b\u505c\u6b62\u4e0d\u518d\u7ee7\u7eed\u6267\u884c\u4e86\uff0c\u800c\u8fd9\u91cc\u6709\u7a7a\u7684default, \u8868\u793a\u7684\u662f\u65e0\u6267\u884c\u4ee3\u7801\uff0c\u4f46\u672c\u6b21\u5faa\u73af\u662f\u53ef\u4ee5\u7ed3\u675f\u7684\uff0c\u7ee7\u7eed\u4e0b\u4e00\u6b21\u5faa\u73af\uff0c\u5c31\u662f\u4e00\u4e2a\u6b7b\u5faa\u73af\u800c\u5df2\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
for{ select { case i := <-chan: \/\/\/\/\/\/code \/\/default […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[5],"tags":[13],"_links":{"self":[{"href":"https:\/\/dulizao.com\/index.php\/wp-json\/wp\/v2\/posts\/121"}],"collection":[{"href":"https:\/\/dulizao.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dulizao.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dulizao.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dulizao.com\/index.php\/wp-json\/wp\/v2\/comments?post=121"}],"version-history":[{"count":2,"href":"https:\/\/dulizao.com\/index.php\/wp-json\/wp\/v2\/posts\/121\/revisions"}],"predecessor-version":[{"id":123,"href":"https:\/\/dulizao.com\/index.php\/wp-json\/wp\/v2\/posts\/121\/revisions\/123"}],"wp:attachment":[{"href":"https:\/\/dulizao.com\/index.php\/wp-json\/wp\/v2\/media?parent=121"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dulizao.com\/index.php\/wp-json\/wp\/v2\/categories?post=121"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dulizao.com\/index.php\/wp-json\/wp\/v2\/tags?post=121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}