{"id":321760,"date":"2021-02-05T14:51:09","date_gmt":"2021-02-05T06:51:09","guid":{"rendered":"http:\/\/4563.org\/?p=321760"},"modified":"2021-02-05T14:51:09","modified_gmt":"2021-02-05T06:51:09","slug":"%e5%85%b3%e4%ba%8e%e6%8c%87%e4%bb%a4%e9%87%8d%e6%8e%92%e5%ba%8f%e6%9c%89%e4%b8%aa%e9%97%ae%e9%a2%98%e4%b8%8d%e6%98%8e%e7%99%bd%ef%bc%8c%e6%b1%82%e5%a4%a7%e4%bd%ac%e6%8c%87%e7%82%b9","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=321760","title":{"rendered":"\u5173\u4e8e\u6307\u4ee4\u91cd\u6392\u5e8f\u6709\u4e2a\u95ee\u9898\u4e0d\u660e\u767d\uff0c\u6c42\u5927\u4f6c\u6307\u70b9"},"content":{"rendered":"
\n
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\u5173\u4e8e\u6307\u4ee4\u91cd\u6392\u5e8f\u6709\u4e2a\u95ee\u9898\u4e0d\u660e\u767d\uff0c\u6c42\u5927\u4f6c\u6307\u70b9 <\/h1>\n

<\/p>\n

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

\u300a JAVA \u5e76\u53d1\u7f16\u7a0b\u7684\u827a\u672f\u300b\u4e00\u4e66\u4e2d\u8bf4\u6307\u4ee4\u91cd\u6392\u5e8f\u53ef\u80fd\u4f1a\u6539\u53d8\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u7684\u6267\u884c\u7ed3\u679c\u3002\u4e3e\u7684\u4f8b\u5b50\u5982\u4e0b\uff1a<\/p>\n

class test { private int a = 0; private boolean flag = false;<\/p>\n

public void change() {     a = 1;     flag = true; }  public void sysout() {     while (flag) {         System.out.println(a);     } } <\/code><\/pre>\n
}<\/p>\n
\u4e66\u4e2d\u8bf4\u4ee5\u4e0a\u7a0b\u5e8f\u5728\u591a\u7ebf\u7a0b\u65f6\uff0c\u8f93\u51fa\u7684\u7ed3\u679c\u4e0d\u4e00\u5b9a\u662f 1\uff0c\u6709\u53ef\u80fd\u662f 0 \uff1b \u4f46\u662f\u6211\u81ea\u5df1\u5c1d\u8bd5\u4e86\u591a\u6b21\u4e5f\u672a\u590d\u73b0\u51fa\u8fd9\u79cd\u60c5\u51b5\uff0c\u56e0\u6b64\u975e\u5e38\u7591\u95ee\u8fd9\u4e2a\u60c5\u51b5\u771f\u7684\u53ef\u4ee5\u590d\u73b0\u51fa\u6765\u5417\uff1f\u8fd9\u4e2a\u6307\u4ee4\u91cd\u6392\u5e8f\u5230\u5e95\u8bf4\u7684\u771f\u7684\u5047\u7684\u5440\uff1f\u5982\u679c\u6709\u590d\u73b0\u51fa\u6765\u7684\u540c\u5b66\u53ef\u4ee5\u53d1\u4e2a\u7a0b\u5e8f\u6267\u884c\u7ed3\u679c\u7684\u56fe\u770b\u4e0b\u561b\uff1f<\/p>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (23<\/span>)        <\/div>\n
 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
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    \n
     \u8cc7\u6df1\u5927\u4f6c : lcdtyph <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4f60\u9700\u8981\u5728\u5f31\u5185\u5b58\u4e00\u81f4\u6027\u7684\u5e73\u53f0\u4e0a\uff08\u5982 arm \uff09\u6765\u590d\u73b0\u8fd9\u4e2a\u73b0\u8c61                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : lewis89 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8bf4\u5b9e\u5728\u8bdd \u8fd9\u4e2a\u4e1c\u897f\u9a8c\u8bc1\u5f88\u56f0\u96be\uff0c\u6d89\u53ca\u5230\u5f88\u591a\u6280\u672f\u7ec6\u8282<\/p>\n
    1. \u4f60\u8981\u786e\u8ba4 class \u6587\u4ef6\u7684\u5b57\u8282\u7801\u662f\u5426\u5b58\u5728\u91cd\u6392\u5e8f\uff0c\u6700\u597d\u53bb\u7ffb\u4e00\u4e0b\u5b57\u8282\u7801\uff0c\u4e00\u822c\u8fd9\u79cd\u7b80\u5355\u7684\u4ee3\u7801\uff0c
    \u6211\u89c9\u5f97\u53ef\u80fd\u5b57\u8282\u7801\u5c42\u9762\u4e0d\u4f1a\u53d1\u751f\u91cd\u6392\u5e8f<\/p>\n
    2. \u4f60\u8981\u7528\u8fd9\u4e9b\u4ee3\u7801 \u53cd\u590d\u8fd0\u884c \u8ba9 JVM \u751f\u6210 JIT \u540e\u7684\u6c47\u7f16\u6307\u4ee4\uff0c\u770b\u4e0b JIT \u540e\u7684\u6c47\u7f16\u4ee3\u7801\u662f\u5426\u5b58\u5728\u91cd\u6392\u5e8f<\/p>\n
    3. CPU \u5c42\u9762\u8fd8\u6709\u5206\u652f\u9884\u6d4b\u8ddf\u6307\u4ee4\u5192\u9669 \u8fd9\u4e2a\u66f4\u52a0\u4e0d\u597d\u9a8c\u8bc1<\/p>\n
    4. \u53e6\u5916\u8fd9\u91cc\u591a\u7ebf\u7a0b\u7684\u8bdd \u8fd8\u8981\u6d89\u53ca\u5230\u5185\u5b58\u53ef\u89c1\u6027\u7684\u95ee\u9898\u7684\uff0c\u56e0\u4e3a CPU \u7684 L1 L2 L3 \u540c\u6b65\u7684\u6a21\u578b\u5f88\u590d\u6742\uff0c
    \u73b0\u5728 X86 \u90fd\u662f TSO \u6a21\u578b\uff0c\u5177\u4f53\u5230 Intel \u4e0b\u9762\u8fd8\u6709 MESI \u7684\u6a21\u578b\uff0c\u53e6\u5916 AMD zen2 \u67b6\u6784\u6d41\u884c\u540e\uff0c
    \u73b0\u5728\u53c8\u5f00\u59cb\u6d41\u884c NUMA \u4e86\uff0c\u603b\u4e4b\u591a\u7ebf\u7a0b\u540c\u6b65\u4e0b\u9762\u7684\u6280\u672f\u7ec6\u8282\u592a\u591a\u3002<\/p>\n
    \u6709\u5174\u8da3\u7684\u8bdd \u4f60\u53ef\u4ee5\u7814\u7a76\u6211\u7684\u8fd9\u7bc7\u535a\u6587\uff0c\u662f\u5173\u4e8e\u5185\u5b58\u53ef\u89c1\u6027\u7684\u7814\u7a76\uff0c\u91cc\u9762\u5bf9 JVM \u7684 JIT \u540e\u7684\u4ee3\u7801 \u7528 GDB \u6253\u65ad\u70b9\u9a8c\u8bc1\u8fc7\u4e86 
    https:\/\/www.cnblogs.com\/richard-winters\/p\/14237940.html<\/p>\n
    \u5173\u4e8e\u91cd\u6392\u5e8f\u8ddf memory barrier \u8fd9\u5757\uff0c\u4f60\u53ea\u8981\u8bb0\u4f4f \u591a\u7ebf\u7a0b\u540c\u6b65\u7684\u65f6\u5019 \u4e00\u5b9a\u8981\u7528 Java \u7684\u9501\u6216\u8005\u539f\u5b50\u53d8\u91cf\u5c31\u884c\u4e86\uff0c
    \u56e0\u4e3a\u8fd9\u4e24\u4e2a\u90fd\u4f1a\u7528 x86 \u7684\u540c\u6b65\u539f\u8bed lock sfence mfence \u7b49\u6307\u4ee4\uff0c\u5982\u679c\u4e0d\u60f3\u641e\u6e05\u695a\u5e95\u5c42\u540c\u6b65\u7684\u539f\u8bed\uff0c\u6700\u597d\u7684\u529e\u6cd5\u5c31\u662f\u8bb0\u4f4f Java \u7684 happen before \u539f\u5219\u5c31\u884c\u4e86\uff0c\u8fd9\u6837\u591a\u7ebf\u7a0b\u7f16\u7a0b\u7684\u65f6\u5019\u5c31\u4e0d\u4f1a\u88ab\u5e95\u5c42\u7684\u6280\u672f\u7ec6\u8282\u7ed9\u641e\u8499 B \u4e86\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
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     \u8cc7\u6df1\u5927\u4f6c : lewis89 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u53e6\u5916\u4e66\u4e0a\u8bb2\u7684\u4e0d\u4e00\u5b9a\u662f\u53d1\u751f\u4e86\u6307\u4ee4\u91cd\u6392\u5e8f\uff0c\u4e5f\u6709\u53ef\u80fd\u662f\u5185\u5b58\u53ef\u89c1\u6027\u7684\u95ee\u9898\uff0c<\/p>\n
    sysout() \u7ebf\u7a0b\u53ef\u80fd\u6839\u672c\u5c31\u6ca1\u89c2\u6d4b\u5230 change() \u7ebf\u7a0b\u91cc\u9762 \u5bf9\u53d8\u91cf a \u7684\u4fee\u6539\uff0c\u56e0\u4e3a a \u65e2\u6ca1\u6709 volatile \uff08 x86 \u7684 lock \u539f\u8bed\uff09\uff0c\u53ef\u80fd\u7ebf\u7a0b sysout() \u53d6\u5230 a \u7684\u503c \u53ea\u662f\u5b83\u5728\u5bc4\u5b58\u5668\u91cc\u9762\u4e4b\u524d\u7684\u62f7\u8d1d\uff0c\u6216\u8005\u662f\u7ebf\u7a0b sysout() CPU \u7684 L1 \u7684\u7f13\u5b58\uff0c
    \u800c\u4e14 sysout() \u8ddf change() \u7ebf\u7a0b \u90fd\u6ca1\u6709\u7528\u5230 \u540c\u6b65\u7684\u539f\u8bed                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : lewis89 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @lewis89 #3 \u5173\u4e8e\u8fd9\u4e9b\u9a8c\u8bc1\u7684\u731c\u60f3\uff0c\u90fd\u5f97\u50cf\u5bfb\u5b9d\u4e00\u6837\uff0c\u8bbe\u7f6e\u5404\u79cd\u8fd0\u884c\u6761\u4ef6\uff0c\u53c2\u8003\u5404\u79cd\u8d44\u6599\uff0c\u7136\u540e\u5230\u6c47\u7f16\u4ee3\u7801\u5c42\u9762\u53bb\u9a8c\u8bc1\u624d\u80fd\u8fd8\u539f\u51fa\u7ed3\u679c\u6765\uff0c\u5bf9\u4e8e\u521d\u5b66\u8005\uff0c\u6211\u4e0d\u5efa\u8bae\u5927\u5bb6\u8fd9\u4e48\u53bb\u7814\u7a76\uff0c\u4e00\u6765\u8fd9\u6837\u7814\u7a76\u7684\u4ef7\u503c\u8ddf\u610f\u4e49\u4e0d\u5927\uff0c\u5e94\u7528\u5c42\u9762\u7684\u7f16\u7a0b\u4f60\u53ea\u8981\u9075\u5faa Java \u63d0\u4f9b\u7684\u62bd\u8c61\u6a21\u578b Happen before \u5373\u53ef\uff0c\u4e8c\u6765\u5982\u679c\u4f60\u8ba1\u7b97\u673a\u4f53\u7cfb\u7ed3\u6784\u57fa\u7840\u4e0d\u662f\u5f88\u624e\u5b9e\u7684\u8bdd\uff0c\u5f88\u96be\u5f04\u660e\u767d\u5e95\u5c42\u5e72\u4e86\u4ec0\u4e48\uff0c\u5f53\u7136\u5982\u679c\u4f60\u662f\u53cd\u6c47\u7f16 \u641e\u7834\u89e3\u51fa\u751f\u7684\uff0c\u8fd9\u4e9b\u95ee\u9898\u5c31\u80fd\u6709\u529e\u6cd5\u7814\u7a76\u6e05\u695a                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : hobochen <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 JSR-133 \u80fd\u6551\u4f60                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : sagaxu <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4e0a\u90fd\u8bf4\u7684\u5f88\u5168\u4e86\uff0c\u6784\u9020\u5e76\u53d1\u9519\u8bef\u6bd4\u5199\u51fa\u6ca1\u6709\u5e76\u53d1\u95ee\u9898\u7684\u4ee3\u7801\u8981\u56f0\u96be\u7684\u591a\uff0c\u9996\u5148\u8981\u6df1\u523b\u7406\u89e3\u5e76\u53d1\u6a21\u578b\uff0c\u7136\u540e\u8981\u719f\u6089\u4e0d\u540c\u7684\u5904\u7406\u5668\u67b6\u6784\uff0c\u9009\u62e9\u5408\u7406\u7684\u5904\u7406\u5668\u67b6\u6784(X86 \u7ecf\u5e38\u4e0d\u884c)\uff0c\u518d\u907f\u5f00\u4e00\u4e9b\u4f1a\u5f71\u54cd\u540c\u6b65\u7684\u6d4b\u8bd5\u4ee3\u7801\uff0c\u7136\u540e\u8fd8\u9700\u8981\u4e00\u70b9\u8fd0\u6c14\u3002<\/p>\n
    System.out.println \u7684\u5185\u90e8\u5b9e\u73b0\u81ea\u5e26\u4e00\u4e2a\u9501\uff0c\u5f71\u54cd\u4e86\u5e76\u53d1\u8bed\u4e49\uff0c\u5b83\u662f\u6700\u5bb9\u6613\u72af\u7684\u9a8c\u8bc1\u5e76\u53d1\u7684\u9519\u8bef\u3002                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : fuse <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8bb2\u7684\u90fd\u662f\u5565\uff0c\u91cd\u6392\u5e8f\u8fd9\u79cd\u8bcd\u90fd\u662f\u81ea\u5df1\u6ca1\u61c2\uff0c\u5176\u4ed6\u5730\u65b9\u6284\u6765\u7684<\/p>\n
    \u8ddf\u6c47\u7f16\u6839\u672c\u6ca1\u5173\u7cfb<\/p>\n
    \u8fd9\u4e2a\u95ee\u9898\u662f smp \u60c5\u51b5\u4e0b\uff0ccpu \u5bf9\u5185\u5b58\u7684\u5199\u662f\u5f02\u6b65\u7684\uff0c\u4e00\u4e2a cpu \u8bfb\u5230 flag \u7b49\u4e8e true \u65f6\uff0ca=1 \u8fd9\u4e2a\u5199\u64cd\u4f5c\u4e0d\u4e00\u5b9a\u5c31\u540c\u6b65\u8fc7\u6765\u5230\u8fd9\u4e2a cpu \u4e0a\uff0c\u53ef\u80fd\u770b\u5230\u7684\u8fd8\u662f 0<\/p>\n
    \u4e3a\u4e86\u4fdd\u969c\u903b\u8f91\u6b63\u786e\uff0c\u9700\u8981\u52a0\u540c\u6b65\u7b49\u5f85\u6307\u4ee4                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : SingeeKing <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4e4b\u524d\u6211\u4eb2\u6d4b\u8fc7\uff08 Intel Mac Oracle JDK 8 \uff09\uff0c\u5728 400 \u591a\u4e07\u6b21\u7684\u65f6\u5019\u51fa\u6765\u8fc7\u4e00\u6b21                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : mind3x <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @lewis89 \u5199\u5f97\u5f88\u8be6\u7ec6\u3002\u8865\u5145\u4e00\u4e0b\uff0cjavac \u751f\u6210\u7684\u5b57\u8282\u7801\u662f\u5b8c\u5168\u9633\u6625\u7684\uff0c\u6ca1\u6709\u4efb\u4f55\u4f18\u5316\uff0c\u4e5f\u4e0d\u4f1a\u6709\u4efb\u4f55\u91cd\u6392\u5e8f\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : lewis89 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @fuse #7 <\/p>\n
    \u91cd\u6392\u5e8f\u662f\u5b8c\u5168\u53ef\u80fd\u53d1\u751f\u7684\uff0c\u56e0\u4e3a\u4ece\u7f16\u8bd1\u5668\u5230 CPU \u90fd\u662f\u4fdd\u8bc1\u5355\u7ebf\u7a0b as-if-serial \u8bed\u4e49\uff0c
    \u591a\u7ebf\u7a0b\u7684\u65f6\u5019\u53ea\u80fd\u7528\u5230\u5904\u7406\u7684\u540c\u6b65\u539f\u8bed\u624d\u80fd\u89e3\u51b3<\/p>\n
    int a = 2;
    int c = 1 + a; 
    float b = 3f \/ 2f;<\/p>\n
    \u50cf\u8fd9\u79cd\u4ee3\u7801 \u7b2c\u4e09\u6761\u4ee3\u7801\u5b8c\u5168\u53ef\u80fd\u53d1\u751f\u91cd\u6392\u5e8f\uff0c\u56e0\u4e3a\u6d6e\u70b9\u8fd0\u7b97\u4f1a\u7528\u5230 FPU \u800c CPU \u5b8c\u5168\u662f\u7a7a\u95f2\u51fa\u6765\u7684\uff0c
    \u800c\u4e14\u4ece CPU \u4f18\u5316\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u7b2c\u4e00\u6761\u6307\u4ee4\u8ddf\u7b2c\u4e8c\u6761\u6709\u4f9d\u8d56\uff0c\u6240\u4ee5\u4e0d\u4f1a\u91cd\u6392\uff0c\u4f46\u662f \u7b2c\u4e09\u6761\u6307\u4ee4\u8ddf \u7b2c\u4e00\u6761 and \u7b2c\u4e8c\u6761\u6307\u4ee4\u4e0d\u5b58\u5728\u4efb\u4f55\u4f9d\u8d56\uff0c\u6240\u4ee5\u5c06 float b= 3f\/2f \u63d0\u524d\u62ff\u51fa\u6765 \u4ea4\u7ed9 FPU \u8ba1\u7b97 \u5f97\u51fa\u7ed3\u679c\u662f\u5b8c\u5168\u5408\u7406\u7684\uff0c\u800c\u4e14\u5e76\u4e0d\u4f1a\u5f71\u54cd\u7a0b\u5e8f\u7684\u6b63\u786e\u6027\uff0c\u5f53\u7136\u8fd9\u4e00\u5207\u90fd\u662f\u5728\u5355\u7ebf\u7a0b\u7684\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u4f60\u591a\u7ebf\u7a0b\u9700\u8981\u540c\u6b65\uff0c\u90a3\u4e48\u5fc5\u7136\u8981\u7528 x86 lock mfence \u8fd9\u4e9b\u539f\u8bed\u6765\u7981\u6b62 \u91cd\u6392\u5e8f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : lewis89 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @mind3x #9 \u8fd9\u4e2a\u6211\u5c31\u4e0d\u4e86\u89e3\u4e86\uff0c\u4ece\u6211\u4e86\u89e3\u7684\u8d44\u6599\u6765\u770b\uff0c\u5305\u62ec\u6211\u770b GCC \u7684\u7f16\u8bd1\u540e\u7684\u6c47\u7f16\uff0c\u90fd\u5b58\u5728\u91cd\u6392\u5e8f\u4f18\u5316\u7684\u60c5\u51b5\uff0c\u6240\u4ee5\u6211\u5bf9 Java \u5b57\u8282\u7801 \u4e5f\u662f\u4e00\u79cd\u731c\u6d4b\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : lewis89 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @sagaxu #6 system.out.println \u8fd9\u4e2a\u6211\u4e5f\u7814\u7a76\u8fc7\u4e86 println \u65b9\u6cd5\u91cc\u9762\u7684 synchronize \u5173\u952e\u5b57 \u5728\u5e95\u5c42\u5c31\u7528\u5230\u4e86 \u540c\u6b65\u7684\u539f\u8bed                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : YouLMAO <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 c \u4e5f\u662f\u4f1a                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : agagega <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5982\u679c\u8bf4\u662f\u7f16\u8bd1\u5668\u5bf9\u6307\u4ee4\u505a\u7684\u91cd\u6392\u5e8f\u4f18\u5316\u7684\u8bdd\uff0c\u5f88\u7b80\u5355\uff1a\u628a\u4e00\u6761\u9664\u6cd5\u8bed\u53e5\u653e\u5728\u4e00\u4e2a\u4e0d\u76f8\u5173\u7684\u52a0\u6cd5\u540e\u9762\uff0c\u5927\u591a\u6570\u5e73\u53f0\u4e0a\u8fd9\u4e2a\u9664\u6cd5\u90fd\u4f1a\u88ab\u8c03\u5230\u524d\u9762\u53bb\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : nuk <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u548c\u8fd0\u884c\u7684 cpu \u67b6\u6784\u6709\u5173\u3002\u3002java \u4e0d\u4fdd\u8bc1\u987a\u5e8f\u4e00\u81f4\u6027                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : lewis89 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @nuk #15 \u51e0\u4e4e\u6240\u6709\u8bed\u8a00\u90fd\u53ea\u662f \u4fdd\u8bc1\u5355\u7ebf\u7a0b\u81ea\u8eab\u7684 as-if-serial \u8bed\u4e49\uff0c\u56e0\u4e3a\u5230 CPU \u5c42\u9762 \u4f60\u4e5f\u4e0d\u77e5\u9053 CPU \u5e72\u4e86\u4ec0\u4e48\u4f18\u5316\uff0cCPU \u4e5f\u662f\u4fdd\u8bc1\u5355\u7ebf\u7a0b\u7684 as-if-serial\uff0c\u9664\u975e\u4f60\u5f3a\u5236\u4f7f\u7528 \u5185\u5b58\u6805\u680f\u53bb\u540c\u6b65\uff0c\u8fd9\u6837 CPU \u5c31\u4f1a invalid \u6389 \u5b83\u7684\u91cd\u6392\u5e8f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : mxalbert1996 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @lewis89 \u91cd\u6392\u5e8f\u662f JIT \u7684\u4e8b\uff0c\u5b8c\u5168\u6ca1\u6709\u5fc5\u8981\u5728\u7f16\u8bd1\u6210\u5b57\u8282\u7801\u7684\u65f6\u5019\u518d\u505a\u4e00\u6b21\u91cd\u6392\u5e8f\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : lewis89 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @mxalbert1996 #17 \u53ea\u662f\u731c\u6d4b\uff0c\u6211\u4e5f\u6ca1\u9a8c\u8bc1\u8fc7\uff0c\u6211\u53ea\u662f\u9488\u5bf9\u5176\u5b83\u7f16\u8bd1\u578b\u8bed\u8a00 \u505a\u51fa\u7684\u731c\u6d4b\u5224\u65ad                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : minato <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8fd9\u4e3a\u5565\u4f1a\u626f\u5230\u6307\u4ee4\u91cd\u6392\uff1f\u8fd9\u4e0d\u662f JMM \u7684\u5e38\u89c4\u53ef\u89c1\u6027\u95ee\u9898\u5417\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : svt <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @lewis89 \u975e\u5e38\u611f\u8c22\u60a8\u7684\u53d1\u8a00<\/p>\n
    @minato 
    @fuse \u4f60\u4eec\u4e24\u4f4d\u8bf4\u7684\u662f\u53ef\u89c1\u6027\u7684\u95ee\u9898\uff0c\u4e0d\u8fc7\u6211\u8fd9\u4e2a\u4e3b\u8981\u662f\u4e3a\u4e86\u63a2\u8ba8\u6307\u4ee4\u91cd\u6392\u5e8f\uff0c\u5f53\u7136\u4ee5\u4e0a\u7a0b\u5e8f\u4e5f\u6709\u53ef\u80fd\u662f\u56e0\u4e3a\u53ef\u89c1\u6027\u5bfc\u81f4\u51fa\u73b0\u7684\u8f93\u51fa 0 \u3002\u6211\u8865\u5145\u4e86\u91cd\u6392\u5e8f\u53ef\u80fd\u51fa\u73b0\u7684\u60c5\u51b5\u3002\u60a8\u53ef\u4ee5\u770b\u4e0b\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : Still4 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4f60\u8fd9\u4e2a\u4f8b\u5b50\u6ca1\u95ee\u9898\uff0c\u6307\u4ee4\u91cd\u6392\u4f1a\u4fdd\u8bc1\u6700\u7ec8\u6267\u884c\u7ed3\u679c\u8ddf\u9884\u671f\u4e00\u6837\uff0c\u4f46\u662f\u4e0d\u4fdd\u8bc1\u987a\u5e8f\uff0c\u4e5f\u5c31\u662f\u8bf4 change \u65b9\u6cd5\u6267\u884c\u5b8c\u4ee5\u540e\uff0ca \u4e00\u5b9a=1\uff0cflag \u4e00\u5b9a=true\uff0c\u4f46\u662f\u8c01\u5148\u8c01\u540e\u4e0d\u4e00\u5b9a<\/p>\n
    \u8fd9\u6837\u4e00\u6765\uff0c\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u76d1\u542c\u7ebf\u7a0b\u8bfb\u53d6\u5230 flag \u53d8\u6210 true \u7684\u65f6\u5019\uff0ca \u7684\u503c\u6709\u53ef\u80fd=0 \u6709\u53ef\u80fd=1\uff0c\u4e0d\u80fd\u6309\u7f16\u7801\u987a\u5e8f\u53bb\u7406\u89e3                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : icyalala <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5355\u8bf4\u6307\u4ee4\u7684\u8bdd\uff1a
    \u4e00\u4e2a\u662f\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u65f6\uff0c\u6307\u4ee4\u53ef\u80fd\u4f1a\u88ab\u91cd\u65b0\u6392\u5e8f\uff0c
    \u4e00\u4e2a\u662f CPU \u5728 Out of Order \u6267\u884c\u6307\u4ee4\u65f6\uff0c\u4e5f\u53ef\u80fd\u4f1a\u88ab\u91cd\u6392\u3002<\/p>\n
    \u8981\u8bf4 Memory Model \u90a3\u6d89\u53ca\u5230\u7684\u4e1c\u897f\u5c31\u66f4\u591a\u4e86\u3002                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : zhch602 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @mxalbert1996 \u91cd\u6392\u5e8f\u5e76\u4e0d\u53ea\u662f JIT \u7684\u4e8b\uff0cCPU \u6307\u4ee4\u6d41\u6c34\u7ebf\u6267\u884c\u6307\u4ee4\u7684\u65f6\u5019\u4e5f\u4f1a\u6307\u4ee4\u91cd\u6392\u7684                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"
    \u5173\u4e8e\u6307\u4ee4\u91cd\u6392\u5e8f\u6709\u4e2a\u95ee\u9898\u4e0d\u660e\u767d\uff0c\u6c42\u5927…<\/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\/321760"}],"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=321760"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/321760\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=321760"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=321760"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=321760"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}