{"id":321660,"date":"2021-02-05T13:31:33","date_gmt":"2021-02-05T05:31:33","guid":{"rendered":"http:\/\/4563.org\/?p=321660"},"modified":"2021-02-05T13:31:33","modified_gmt":"2021-02-05T05:31:33","slug":"go-map-%e5%b9%b6%e5%8f%91%e5%86%99%e7%9a%84%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=321660","title":{"rendered":"go map \u5e76\u53d1\u5199\u7684\u95ee\u9898"},"content":{"rendered":"
\n
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go map \u5e76\u53d1\u5199\u7684\u95ee\u9898 <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : yujianwjj <\/span> <\/i> 6<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u573a\u666f\u662f\u591a\u4e2a goroutine \u5bf9\u4e00\u4e2a map \u53ea\u5199\u4e0d\u8bfb\u3002<\/p>\n

\u6700\u5f00\u59cb\u7528\u52a0\u9501\u7684\u65b9\u5f0f\uff0c\u6765\u5b9e\u73b0\u591a\u4e2a goroutine \u5bf9\u4e00\u4e2a map \u8fdb\u884c\u5199\u5165\u3002\u540e\u6765\u53d1\u73b0\u6548\u7387\u6709\u70b9\u4f4e\u3002\u5c31\u5c1d\u8bd5\u4e86\u4e0b\u4e0d\u52a0\u9501\u7684\u65b9\u5f0f\u3002<\/p>\n

func TestMap(t *testing.T) {  a := map[string]int{}  count := 100  wg := sync.WaitGroup{}  wg.Add(count)  for i := 0; i < count; i++ {   go func(i int) {    a[fmt.Sprintf(\"%d\", i)] = i    wg.Done()   }(i)  }  wg.Wait()  for k, v := range a {   fmt.Println(k, \" \", v)  } } <\/code><\/pre>\n
\u4ee5\u4e0a\u6d4b\u8bd5\u4ee3\u7801\u80fd\u591f\u6b63\u5e38\u5de5\u4f5c\uff0c\u5e76\u4e14\u5199\u5165\u7684\u6570\u636e\u6b63\u786e\uff0c\u6211\u5c31\u4ee5\u4e3a map \u53ea\u5199\u4e0d\u8bfb\u7684\u60c5\u51b5\u662f\u53ef\u4ee5\u4e0d\u52a0\u9501\u7684\u3002<\/p>\n
\u4f46\u662f\u5b9e\u9645\u573a\u666f\u4e2d count \u4e3a 5000\uff0c\u7136\u540e\u5c31\u62a5\u9519\u4e86\uff1a<\/p>\n
fatal error: concurrent map writes <\/code><\/pre>\n
\u73b0\u5728\u6709\u4e24\u4e2a\u95ee\u9898\uff1a<\/p>\n
    \n
  1. \u4e3a\u4ec0\u4e48 count \u4e3a 5000 \u5c31\u62a5\u9519\uff0c100 \u7684\u65f6\u5019\u4e0d\u62a5\u9519\u3002<\/li>\n
  2. \u591a\u4e2a goroutine \u5bf9 map \u53ea\u5199\u4e0d\u8bfb\u7684\u573a\u666f\u6709\u4ec0\u4e48\u6548\u7387\u66f4\u9ad8\u7684\u65b9\u5f0f\u3002<\/li>\n<\/ol><\/div>\n
     \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (30<\/span>)        <\/div>\n
     <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
      \n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : YUX <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u7528 sync.Map                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : Takamine <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   5000 \u62a5\u9519\uff0c100 \u4e0d\u62a5\u9519\u5c31\u662f\u5355\u7eaf\u6982\u7387\u95ee\u9898\u5427\u3002<\/p>\n
      \u53ea\u5199\u4e0d\u8bfb\u53ef\u4ee5\u7ed9 map \u5305\u4e00\u5c42\u65b9\u6cd5\uff0c\u5728\u5199\u7684\u5730\u65b9\u52a0\u9501\u3002                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : BeautifulSoap <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u56e0\u4e3a\u4f60 count 5000 \u7684\u65f6\u5019\u89e6\u53d1 map \u540c\u65f6\u5199\u5165\u7684\u51e0\u7387\u975e\u5e38\u9ad8\u554a\u3002\u3002\u3002<\/p>\n
      100 \u4e00\u4e0b\u5b50\u5c31\u6267\u884c\u5b8c\u6bd5\u4e86\u6570\u91cf\u4e5f\u5c11\u540c\u65f6\u5199\u5165\u51e0\u7387\u5c0f                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : kiddingU <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   @YUX \u770b\u4e3b\u7684\u573a\u666f\u662f\u53ea\u5199\u4e0d\u8bfb\uff0csync.Map \u4e0d\u9002\u5408\u8fd9\u79cd\u573a\u666f\uff0c\u9501\u7684\u7c92\u5ea6\u592a\u5927\uff0c \u7528 concurrent map \u5c31\u884c\uff0c\u6216\u8005\u81ea\u5df1\u5199\u4e00\u4e2a\u7b97\u6cd5\uff0c\u51cf\u5c0f\u9501\u7684\u7c92\u5ea6                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : MidGap <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u54c8\u54c8\u54c8\u54c8\u54c8\u597d\u53ef\u7231                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : JKeita <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u6211\u8fd9 10 \u90fd\u62a5\u9519\uff0c\u53ef\u80fd\u8ddf\u7535\u8111 CPU \u6027\u80fd\u6709\u5173\u5427\uff0c\u628a\u6570\u636e\u5148\u5e76\u53d1\u5165 chan\uff0c\u518d\u6309\u987a\u5e8f\u8bfb\u53d6\u5199\u5165 map \uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : monsterxx03 <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   100 \u7684\u65f6\u5019\u4f60\u591a\u8bd5\u51e0\u6b21\u5c31\u6302\u4e86\uff0c\u6216\u8005\u52a0 -race.
      sync.Map \u53ea\u5bf9\u8bfb\u591a\u5199\u5c11\u7684\u573a\u666f\u6709\u6548\u7387\u63d0\u5347.
      \u5355 map \u6bcf\u6b21\u5199\u52a0\u9501\u53ef\u80fd\u8fd8\u4e0d\u5982\u987a\u5e8f\u5199.
      \u4e00\u822c\u4f18\u5316\u601d\u8def\u662f\u505a sharding, \u6bd4\u5982\u9884\u5148\u5206\u914d 8 \u4e2a map, \u6bcf\u6b21\u5199\u7684\u65f6\u5019 i%8 \u51b3\u5b9a\u5199\u5165\u54ea\u4e2a map                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : capti0n <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u4e2a\u4eba\u7406\u89e3\uff1a
      1.golang \u7684 map \u662f hashmap\uff0c\u4f1a\u9ed8\u8ba4\u5206\u914d\u4e00\u90e8\u5206\u6876\u51fa\u6765\uff0c\u8fd9\u65f6\u5e76\u884c\u5199\u5165\u6216\u8005\u8bbf\u95ee\u6ca1\u95ee\u9898\uff0c
      \u5f53\u8d85\u8fc7\u4e00\u5b9a\u9608\u503c\uff0c\u4f1a\u89e6\u53d1\u6269\u5bb9\uff0c\u8fd9\u65f6\u5c31\u4f1a\u6709\u5e76\u53d1\u95ee\u9898\u3002
      2.sync.map \u6709\u8bd5\u8fc7\u5417\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : yujianwjj <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   @kiddingU \u4f60\u8bf4\u7684 concurrent map \u662f\u8fd9\u4e2a\u5417\uff1f https:\/\/github.com\/orcaman\/concurrent-map                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : Jooooooooo <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u7b2c\u4e00\u4e2a\u7591\u95ee\u518d\u6b21\u8bf4\u660e\u5e76\u53d1 bug \u5f88\u96be\u53d1\u73b0.                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : kiddingU <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   @yujianwjj \u662f\u7684\uff0c\u4e5f\u662f\u52a0\u9501\uff0c\u53ea\u4e0d\u8fc7\u662f\u5bf9\u9501\u8fdb\u884c\u4e86 shard\uff0c\u51cf\u8f7b\u9501\u7684\u7c92\u5ea6                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : YUX <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   @kiddingU \u597d\u7684 \u5b66\u4e60\u4e86                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : cloverstd <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u6bd4\u8f83\u597d\u5947                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : joesonw <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u8865\u5145 8 , \u8fd9\u91cc\u662f\u5b66\u4e60\u8d44\u6599, https:\/\/draveness.me\/golang\/docs\/part2-foundation\/ch03-datastructure\/golang-hashmap\/                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : nuk <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u56e0\u4e3a\u52a0\u7684\u8d8a\u591a hash \u51b2\u7a81\u5c31\u8d8a\u591a\uff0c\u6dfb\u52a0\u4e00\u4e2a\u952e\u82b1\u7684\u65f6\u95f4\u5c31\u8d8a\u4e45\uff0c\u8d85\u8fc7\u4e86\u542f\u52a8\u4e00\u4e2a goroutine \u7684\u65f6\u95f4\uff0c\u5c31\u4f1a\u62a5\u9519\u4e86\u3002
      \u7528\u65e0\u9501\u961f\u5217\u7136\u540e\u5355\u7ebf\u7a0b\u5199\u597d\u4e00\u70b9\u5427\uff0c\u5199 map \u5e94\u8be5\u4e0d\u662f\u74f6\u9888                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : ihipop <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   @nuk \u5f04\u4e2a chanel \u5355\u5411\u704c\u8fdb\u53bb\u5c31\u884c\u5427\u3002\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : nuk <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   @ihipop channel \u6709\u9501\u7684\u5440\uff0c\u592a\u591a goroutine \u5199\u5c31\u4e0d\u884c\u4e86                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : YouLMAO <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u4e3b\u662f\u53ea\u5199\u4e0d\u8bfb, \u5fc5\u987b\u7528 mutex, \u8fde rwmutex \u90fd\u4e0d\u8981, \u5fc5\u987b\u6bd4 sync.Map \u6027\u80fd\u597d, \u6211\u8bf4\u7684, \u6027\u80fd\u7ecf\u8fc7 G \u5bb6\u8ba4\u8bc1                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : raaaaaar <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u4e3a\u4ec0\u4e48\u53ea\u5199\u4e0d\u8bfb\uff1f\u53ea\u5199\u7684\u7684\u8bdd\u90a3\u4e9b\u6570\u636e\u6709\u4ec0\u4e48\u7528\uff0c\u662f\u4ec0\u4e48\u4e1a\u52a1\u573a\u666f\u554a                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : felixin <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   If there is only one lesson I learn from the 30 years experience of network\/multi-threading programming, that is NEVER SHARE STATES.<\/p>\n
      Pieter Hintjens                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : xmge <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   1. \u6982\u7387\u95ee\u9898\uff0c\u5bf9\u5171\u4eab\u8d44\u6e90\u540c\u65f6\u64cd\u4f5c\u80af\u5b9a\u4f1a\u62a5\u9519
      2. \u5982\u679c\u662f\u53ea\u8bfb\u4e0d\u5199\uff0c\u53ea\u80fd\u52a0\u9501\uff0csync.map \u4e5f\u4e0d\u8981\u7528\uff0csync.map \u5e95\u5c42\u662f\u8bfb\u5199\u5206\u79bb\uff0c\u5199\u65f6\u52a0\u9501\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : yzbythesea <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   chan or mutex lock                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : Kinnice <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u4f60\u7535\u8111\u6027\u80fd\u6709\u70b9\u597d                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : yujianwjj <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u62b1\u6b49\uff0c\u9898\u76ee\u63cf\u8ff0\u6709\u8bef\uff0c\u6211\u7684\u573a\u666f\u662f\u5148\u5199\u540e\u8bfb\uff0c\u5148\u52a0\u8f7d\u5927\u91cf\u7684\u6570\u636e\u5230 map \u91cc\u9762\uff0c\u540e\u9762\u518d\u67e5\u627e\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : march1993 <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u7528 goroutine+chan \u554a\uff0c\u4e00\u4e2a routine \u4e13\u95e8\u8bfb chan \u7136\u540e\u4fee\u6539 map\uff0c\u5176\u4ed6 routine \u628a\u8981\u4fee\u6539\u7684\u5185\u5bb9\u53d1\u5230 chan \u91cc                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : sunshinev <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   sync.Map                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : mengdodo <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u6211\u8bb0\u5f97\u5f53\u521d\u770b\u5230\u8fc7\u8fd9\u6837\u4e00\u53e5\u8bdd\uff1aGo \u4e2d\u7684 Map \u7c7b\u578b\u4e0d\u662f\u4e00\u79cd\u5b89\u5168\u7684\u6570\u636e\u7c7b\u578b\u3002\u6240\u4ee5\u6211\u6bd4\u8f83\u83dc\uff0c\u76f4\u63a5\u5199\u5230 redis \u4e2d                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : kiddingU <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u8bf4\u7528 chan \u7684\uff0cchan \u5e95\u5c42\u6570\u636e\u7ed3\u6784\u662f\u4e2a\u5565\uff0c\u6709\u7814\u7a76\u8fc7\u5417~                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : Dongxiem <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   @kiddingU \u8fd9\u4e2a\u5f88\u96be\u8bf4\u7684\u6e05\u695a\u7684\u5427\uff1f\u53ef\u4ee5\u770b\u770b\u8fd9\u4e2a \u6df1\u5ea6\u89e3\u5bc6 Go \u8bed\u8a00\u4e4b channel \uff08 https:\/\/zhuanlan.zhihu.com\/p\/74613114 \uff09                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : kiddingU <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u6709\u5565\u96be\u8bf4\u6e05\u695a\u7684\uff0c\u770b\u6e90\u7801\u4e0d\u5c31\u6e05\u695a\u4e86~                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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