{"id":89002,"date":"2019-07-29T18:27:09","date_gmt":"2019-07-29T10:27:09","guid":{"rendered":"http:\/\/4563.org\/?p=89002"},"modified":"2019-07-29T18:27:09","modified_gmt":"2019-07-29T10:27:09","slug":"%e6%9c%89%e5%85%b3-golang-%e5%a4%9a%e7%ba%bf%e7%a8%8b%e5%af%b9%e6%95%b0%e7%bb%84%e6%93%8d%e4%bd%9c%e6%97%b6%e7%9a%84%e6%80%a7%e8%83%bd%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=89002","title":{"rendered":"\u6709\u5173 Golang \u591a\u7ebf\u7a0b\u5bf9\u6570\u7ec4\u64cd\u4f5c\u65f6\u7684\u6027\u80fd\u95ee\u9898"},"content":{"rendered":"
\n
\n
\n

\u6709\u5173 Golang \u591a\u7ebf\u7a0b\u5bf9\u6570\u7ec4\u64cd\u4f5c\u65f6\u7684\u6027\u80fd\u95ee\u9898 <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : vcfghtyjc <\/span> <\/i> 43<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u6211\u5c1d\u8bd5\u7740\u7528\u591a\u7ebf\u7a0b\u5206\u522b\u8fd0\u884c\u4ee5\u4e0b\u4e24\u4e2a\u51fd\u6570\uff0c\u5e76\u4f7f\u7528 time<\/code> \u6765\u67e5\u770b\u5b83\u4eec\u7684 cpu \u4f7f\u7528\u7387\uff0c\u4e00\u4e2a\u7684\u4f7f\u7528\u7387\u5c31\u7b26\u5408\u542f\u52a8\u7684\u7ebf\u7a0b\u6570\uff08\u6bd4\u5982 8 \u7ebf\u7a0b\u5c31\u5f97\u5230 800% \u7684\u4f7f\u7528\u7387\uff09\uff0c\u53e6\u4e00\u4e2a\u5c31\u65e0\u6cd5\u5f97\u5230\u76f8\u7b26\u5408\u7684 cpu \u4f7f\u7528\u7387 (\u6bd4\u5982 8 \u7ebf\u7a0b\u5f97\u5230 600% \u7684\u4f7f\u7528\u7387\uff0c2 \u7ebf\u7a0b\u5f97\u5230 300% \u7684\u4f7f\u7528\u7387)\u3002\u867d\u7136\u4e24\u4e2a\u51fd\u6570\u90fd\u6ca1\u6709\u7ebf\u7a0b\u95f4\u7684\u4e92\u65a5\u9501\uff0c\u8fd9\u4e24\u4e2a\u51fd\u6570\u7684\u533a\u522b\u5728\u4e8e\uff1a\u7b2c\u4e00\u4e2a\u51fd\u6570\u6ca1\u6709\u5bf9\u6570\u7ec4\u7684\u64cd\u4f5c\uff0c\u7b2c\u4e8c\u4e2a\u51fd\u6570\u6709\u5bf9\u6570\u7ec4\u7684\u64cd\u4f5c\u3002\u5177\u4f53\u51fd\u6570\u5982\u4e0b\uff1a<\/p>\n

\u51fd\u6570 1: addOne<\/p>\n

\u8be5\u51fd\u6570\u6301\u7eed\u505a\u52a0\u6cd5\u8fd0\u7b97<\/p>\n

func addOne(n int,wg *sync.WaitGroup){     var i int     for i < n{         i++     }     wg.Done() } <\/code><\/pre>\n
\u51fd\u6570 2: appendArray<\/p>\n
\u8be5\u51fd\u6570\u4e0d\u65ad\u5411\u4e00\u4e2a\u6570\u7ec4\u4e2d\u6dfb\u52a0\u5143\u7d20\uff0c\u4e3a\u4e86\u9632\u6b62\u5185\u5b58\u6ea2\u51fa\uff0c\u6bcf\u6dfb\u52a0 10,000 \u4e2a\u5143\u7d20\uff0c\u5c31\u6e05\u7a7a\u6570\u7ec4\u3002<\/p>\n
func appendArray(n int,wg *sync.WaitGroup){     var i int     list := make([]int,10000)     for i < n{         for j := 0 ; j < 10000; j++{             list = append(list, i)         }         list = make([]int,10000)         i++     }     wg.Done() } <\/code><\/pre>\n
\u542f\u52a8\u591a\u7ebf\u7a0b\u7684\u51fd\u6570: test<\/p>\n
\u8be5\u51fd\u6570\u5c06\u5de5\u4f5c\u603b\u6570 totalJobs<\/code> \u5e73\u5206\u7ed9\u6bcf\u4e2a\u7ebf\u7a0b<\/p>\n
func test(totalThreads, totalJobs int){     n := totalJobs\/totalThreads     var wg sync.WaitGroup     for i := 0; i < totalThreads; i++{         wg.Add(1)         go appendArray(n,&wg)         \/\/ go addOne(n,&wg)     }     wg.Wait() } <\/code><\/pre>\n
\u901a\u8fc7\u4f7f\u7528 pprof<\/code>, \u4e24\u4e2a\u4ee3\u7801\u7684 cpu \u5206\u6790\u5982\u4e0b\uff1a<\/p>\n
\u51fd\u6570 1: \"\u6709\u5173<\/p>\n
\u51fd\u6570 2: \"\u6709\u5173<\/p>\n
\u6211\u53d1\u73b0\u5bf9\u4e8e\u7b2c\u4e8c\u4e2a\u51fd\u6570\uff0c\u867d\u7136\u4ee3\u7801\u4e2d\u6ca1\u6709\u8c03\u7528\u9501\uff0c\u5728\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d\u4f1a\u51fa\u73b0 runtime lock<\/code>, runtime futex<\/code> \u4e4b\u7c7b\u7684\u9501\u64cd\u4f5c\u3002<\/p>\n
\u8fd9\u91cc\u6211\u4e0d\u660e\u767d\u7684\u662f\uff1a<\/p>\n
    \n
  1. \u4e3a\u4ec0\u4e48\u5728\u6709\u6570\u7ec4\u64cd\u4f5c\u540e\uff0c\u7f16\u8bd1\u540e\u7684\u7a0b\u5e8f\u51fa\u73b0\u4e86\u9501\u64cd\u4f5c\uff0c\u4ece\u800c\u5f71\u54cd\u529b cpu \u7684\u4f7f\u7528\uff1f<\/li>\n
  2. \u5982\u4f55\u907f\u514d \/\u51cf\u7f13\u8fd9\u4e9b\u9501\u64cd\u4f5c\u5e26\u6765\u7684\u6027\u80fd\u5f71\u54cd\uff1f<\/li>\n<\/ol><\/div>\n
     \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (17<\/span>)        <\/div>\n
     <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
      \n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : nifury <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u56e0\u4e3a append \u505a\u4e0d\u5230\u539f\u5b50\u64cd\u4f5c\u5427\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : ncwhale <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   mem alloc \u548c move \u90fd\u662f\u5f00\u9500\u5927\u5934\u554a\u55b5\u2026\u2026\u6ca1\u4e8b\u522b\u8fd9\u4e48\u73a9\u5185\u5b58\u554a\u55b5\u2026\u2026\u788e\u7247\u5316\u548c\u53cd\u590d\u62f7\u8d1d\u90fd\u662f\u8d85\u7ea7\u6d88\u8017\u8d44\u6e90\u7684\uff0c\u800c\u4e14\uff0c\u8fd8\u56e0\u4e3a\u5185\u5b58 \/\u7f13\u5b58 \/CPU \u591a\u6838\u540c\u6b65\u7b49\u95ee\u9898\uff0c\u5bfc\u81f4\u5fc5\u987b\u4e0a\u9501\u5426\u5219\u4f1a\u51fa\u73b0\u672a\u77e5\u5185\u5b58\u5206\u5e03\u72b6\u6001\u55b5\u2026\u2026<\/p>\n
      \u6b63\u5e38\u4e00\u70b9\u505a\u6cd5\u5c31\u662f\u522b\u5728\u5faa\u73af\u91cc\u8279\u6570\u7ec4\u5c3a\u5bf8\u55b5\uff01\u63d0\u524d\u9884\u5224\u4e00\u4e0b\u5206\u914d\u7a7a\u95f4\u5c31\u597d\uff01<\/p>\n
      \u5426\u5219\u8bf7\u4f7f\u7528\u5176\u5b83\u6570\u636e\u7ed3\u6784\u800c\u4e0d\u662f\u6570\u7ec4\uff01                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : mcrwayfun <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u6211\u60f3\u4e3b\u60f3\u8868\u8fbe\u7684\u662f\u5207\u7247\u800c\u4e0d\u662f\u6570\u7ec4                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : gramyang <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u6211\u6d4b\u8bd5\u8fc7 append \u662f\u53ef\u4ee5\u76f4\u63a5\u64cd\u4f5c\u4e00\u4e2a\u5207\u7247\u58f0\u660e\u800c\u4e0d\u62a5\u7a7a\u6307\u9488\u7684\uff0c\u6240\u4ee5 append \u91cc\u9762\u4f1a\u8c03\u7528 make \u8fd4\u56de\u4e00\u4e2a\u5207\u7247\u5b9e\u4f8b\u3002\u8fd9\u79cd\u64cd\u4f5c\u5fc5\u7136\u662f\u8017\u65f6\u64cd\u4f5c\u3002
      \u4e0d\u8fc7\u9898\u4e3b\u7528\u7684\u8fd9\u4e2a pprof \u770b\u8d77\u6765\u633a\u597d\u7528\u7684\uff0c\u53ef\u4ee5\u8bd5\u8bd5                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : Herobs <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   make \u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u957f\u5ea6\uff0c\u7b2c\u4e09\u4e2a\u53c2\u6570\u624d\u662f\u5bb9\u91cf\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : useben <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   make \u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u957f\u5ea6\uff0c\u7b2c\u4e09\u4e2a\u53c2\u6570\u624d\u662f\u5bb9\u91cf\u3002+1
      \u4f60\u8fd9\u91cc\u8fd8\u662f\u4f1a\u6307\u6570\u5206\u914d\u5185\u5b58                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : nifury <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   @mcrwayfun #3 \u554a\u778e\u4e86\u3002\u5c31\u626b\u4e86\u4e00\u773c\u6ca1\u8fc7\u5927\u8111                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : zhs227 <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   append \u5f88\u591a\u60c5\u51b5\u4e0b\u662f\u5bf9\u5bf9\u5185\u5b58\u8fdb\u884c malloc, memcpy, free\u3002\u8fd9\u4e9b\u64cd\u4f5c\u672a\u5b8c\u6210\u4e4b\u524d\u662f\u4e0d\u4f1a\u8fd4\u56de\u7684\u3002\u6240\u4ee5\u4f60\u4f1a\u770b\u5230\u5404\u79cd\u9501\u3002\u5728\u6709\u9501\u7684\u72b6\u6001\u4e0b\uff0c\u5176\u5b83\u7684 goroutine \u5b9e\u9645\u4e0a\u662f\u5728\u7b49\u5f85\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : dazhangpan <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u7528 time \u67e5\u770b CPU \u7684\u4f7f\u7528\u7387\uff1f\uff1f\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : Smash <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u6b6a\u4e2a\uff0c\u4e3b\u51fd\u6570\u8c03\u7528\u56fe\u662f\u7528\u4ec0\u4e48\u751f\u6210\u7684\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : qieqie <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   @Smash pprof \u7136\u540e\u7528 svg \u6216\u8005\u522b\u7684\u56fe\u7247\u683c\u5f0f\u5bfc\u51fa                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : watsy0007 <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   “`golang
      func appendArray(n int,wg *sync.WaitGroup){
       var i int
       list := make([]int,10000)
       for i < n{
       for j := 0 ; j < 10000; j++{
       list[j] = i
       }
       list = make([]int,10000)
       i++
       }
       wg.Done()
      }
      “`                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : whoami9894 <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u539f\u56e0\u5c31\u662f#5 \u8bf4\u7684\uff0c\u5e94\u8be5`make([]int, 0, 10000)`                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : CEBBCAT <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u9f13\u6363\u4e86\u5927\u534a\u5929\uff0c\u88ab\u4eba\u5bb6\u51e0\u5c0f\u65f6\u4e4b\u524d\u5c31\u8bf4\u8fc7\u4e86\uff0c\u4e0d\u723d\u554a\u2026\u2026 <\/p>\n
      https:\/\/play.golang.org\/p\/3iTdWuMIgoe                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : vcfghtyjc <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   @ncwhale \u662f\u5426\u5bf9\u4e8e\u4efb\u4f55\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u90fd\u4f1a\u51fa\u73b0\u8fd9\u4e2a\u95ee\u9898\uff08\u7ebf\u7a0b\u7533\u8bf7\u65b0\u7684\u5185\u5b58\u65f6\uff0c\u6240\u6709\u7ebf\u7a0b\u9700\u8981\u7528\u9501\u6765\u540c\u6b65\u5f53\u524d\u8fdb\u7a0b\u63a7\u5236\u7684\u5185\u5b58\uff09\uff1f\u5982\u679c\u7528\u5176\u4ed6\u8bed\u8a00\uff0c\u5982 C++\uff0c\u5b83\u7684 overhead \u8fd8\u6709\u8fd9\u4e48\u9ad8\u5417\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : vcfghtyjc <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   @dazhangpan \u6709\u4ec0\u4e48\u63a8\u8350\u7684\u5de5\u5177\u5417\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : fcten <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u5185\u5b58\u5206\u914d\u662f\u5fc5\u7136\u8981\u52a0\u9501\u7684\uff0c\u56e0\u4e3a\u5806\u5185\u5b58\u662f\u6574\u4e2a\u7a0b\u5e8f\u5171\u4eab\u7684
      \u6bd4\u8f83\u73b0\u4ee3\u7684\u5185\u5b58\u5206\u914d\u5668\u4f1a\u5bf9\u591a\u7ebf\u7a0b\u573a\u666f\u8fdb\u884c\u4f18\u5316\uff0c\u628a\u4e00\u90e8\u5206\u5185\u5b58\u5212\u5206\u4e3a\u7ebf\u7a0b\u72ec\u5360\uff0c\u4ece\u800c\u51cf\u5c11\u9501\u7684\u4f7f\u7528\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n","protected":false},"excerpt":{"rendered":"
      \u6709\u5173 Golang \u591a\u7ebf\u7a0b\u5bf9\u6570\u7ec4\u64cd…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/89002"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=89002"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/89002\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=89002"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=89002"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=89002"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}