{"id":88761,"date":"2026-08-01T17:43:35","date_gmt":"2026-08-01T09:43:35","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/88761.html"},"modified":"2026-08-01T17:43:35","modified_gmt":"2026-08-01T09:43:35","slug":"g1-%e5%9e%83%e5%9c%be%e5%9b%9e%e6%94%b6%e5%99%a8-%ef%bc%9asatb-tams%e6%a0%b8%e5%bf%83%e6%9c%ba%e5%88%b6%e6%b7%b1%e5%ba%a6%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/88761.html","title":{"rendered":"G1 \u5783\u573e\u56de\u6536\u5668 \uff1aSATB + TAMS\u6838\u5fc3\u673a\u5236\u6df1\u5ea6\u89e3\u6790"},"content":{"rendered":"

\u524d\u8a00<\/h3>\n

\u5728 JVM \u5783\u573e\u56de\u6536\u9886\u57df，G1（Garbage First） \u51ed\u501f\u5176\u53ef\u9884\u6d4b\u7684\u505c\u987f\u65f6\u95f4\u548c\u4f18\u79c0\u7684\u541e\u5410\u8868\u73b0，\u5df2\u7ecf\u6210\u4e3a\u670d\u52a1\u7aef\u5e94\u7528\u7684\u9996\u9009\u6536\u96c6\u5668\u4e4b\u4e00\u3002\u800c\u652f\u6491 G1 \u6b63\u786e\u8fdb\u884c\u5e76\u53d1\u6807\u8bb0\u7684\u6838\u5fc3，\u5c31\u662f SATB（Snapshot At The Beginning） \u7b97\u6cd5\u4ee5\u53ca TAMS（Top At Mark Start） \u6307\u9488\u673a\u5236\u3002<\/p>\n

\u4e00\u3001SATB：Snapshot At The Beginning（\u539f\u59cb\u5feb\u7167）<\/h3>\n

1.1 \u6838\u5fc3\u601d\u60f3<\/h4>\n

\u4e00\u8f6e\u5e76\u53d1\u6807\u8bb0\u521a\u521a\u542f\u52a8\u7684\u77ac\u95f4，G1 \u4f1a\u5f62\u6210\u4e00\u5f20\u903b\u8f91\u5feb\u7167：\u51e1\u662f\u5feb\u7167\u4e2d\u5b58\u5728\u7684\u5bf9\u8c61，\u672c\u8f6e GC \u90fd\u5fc5\u987b\u5f53\u4f5c\u5b58\u6d3b\u5bf9\u8c61\u5904\u7406\u3002<\/p>\n

\u901a\u4fd7\u7406\u89e3：\u5728\u6807\u8bb0\u542f\u52a8\u90a3\u4e00\u523b\u8fd8\u6d3b\u7740\u7684\u5bf9\u8c61，\u54ea\u6015\u5728\u6807\u8bb0\u8fdb\u884c\u4e2d\u5f7b\u5e95\u6ca1\u4eba\u4f7f\u7528\u4e86，\u672c\u8f6e GC \u4e5f\u4e0d\u80fd\u56de\u6536\u5b83，\u53ea\u80fd\u7b49\u5230\u4e0b\u4e00\u8f6e GC \u6e05\u7406\u3002\u7531\u6b64\u4ea7\u751f\u7684\u201c\u53ef\u56de\u6536\u4f46\u672c\u8f6e\u4e0d\u56de\u6536\u201d\u7684\u5bf9\u8c61，\u88ab\u79f0\u4e3a\u6d6e\u52a8\u5783\u573e\u3002<\/p>\n

1.2 \u5e76\u53d1\u6807\u8bb0\u5b58\u5728\u7684\u98ce\u9669（\u9644\u5b8c\u6574\u65f6\u5e8f\u6848\u4f8b）<\/h4>\n

GC \u7ebf\u7a0b\u6b63\u5728\u904d\u5386\u5bf9\u8c61\u56fe\u5bfb\u627e\u5b58\u6d3b\u8282\u70b9，\u4e0e\u6b64\u540c\u65f6\u4e1a\u52a1\u7ebf\u7a0b\u8fd8\u5728\u4e0d\u65ad\u4fee\u6539\u5bf9\u8c61\u5f15\u7528\u3002\u5f53\u4e0b\u9762\u8fd9\u4e2a\u975e\u5e38\u4e25\u683c\u7684\u65f6\u5e8f\u6761\u4ef6\u540c\u65f6\u6ee1\u8db3\u65f6，\u5c31\u4f1a\u51fa\u73b0\u6f0f\u6807，\u5bfc\u81f4\u5b58\u6d3b\u5bf9\u8c61\u88ab\u9519\u8bef\u56de\u6536：<\/p>\n

  • \u67d0\u5bf9\u8c61 A \u539f\u672c\u6301\u6709\u5bf9\u8c61 B \u7684\u5f15\u7528，GC \u7ebf\u7a0b\u5df2\u7ecf\u904d\u5386\u5b8c\u6210\u5bf9\u8c61 A，\u4e0d\u4f1a\u518d\u6b21\u56de\u5934\u626b\u63cf A；<\/li>\n
  • \u4e1a\u52a1\u7ebf\u7a0b\u5e76\u884c\u6267\u884c\u4e24\u4ef6\u4e8b：\u2460 \u5207\u65ad A \u5bf9 B \u7684\u5f15\u7528（A.field = null）；\u2461 \u5df2\u7ecf\u88ab GC \u904d\u5386\u5b8c\u6bd5\u7684\u5b58\u6d3b\u5bf9\u8c61 C，\u65b0\u5efa\u5f15\u7528\u6307\u5411 B（C.field = B）\u3002<\/li>\n

    \u26a0\ufe0f \u5173\u952e\u6b67\u4e49\u63d0\u9192：\u5982\u679c C \u8fd8\u6ca1\u6709\u88ab GC \u904d\u5386\u5230，\u90a3\u4e48\u540e\u7eed GC \u626b\u63cf\u5230 C \u65f6\u81ea\u7136\u80fd\u53d1\u73b0 B，\u5b8c\u5168\u4e0d\u4f1a\u4ea7\u751f\u6f0f\u6807！\u6f0f\u6807\u6210\u7acb\u7684\u786c\u6027\u524d\u63d0\u662f：\u521b\u5efa\u65b0\u5f15\u7528\u7684\u5bf9\u8c61 C，GC \u5df2\u7ecf\u626b\u63cf\u5b8c\u6bd5，\u4e0d\u4f1a\u518d\u88ab\u8bbf\u95ee\u3002<\/p>\n

    \u4ece\u5ba2\u89c2\u4e8b\u5b9e\u6765\u770b：B \u4f9d\u7136\u88ab C \u5f15\u7528，B \u662f\u5b58\u6d3b\u5bf9\u8c61\u3002\u4ece GC \u89c6\u89d2\u6765\u770b：A \u5df2\u7ecf\u5904\u7406\u5b8c\u6bd5\u4e0d\u518d\u56de\u770b；C \u65e9\u5df2\u626b\u63cf\u5b8c\u6210，GC \u770b\u4e0d\u5230 C \u65b0\u5efa\u7684\u5f15\u7528\u3002GC \u8bef\u4ee5\u4e3a B \u65e0\u4efb\u4f55\u5f15\u7528，\u5224\u5b9a\u4e3a\u5783\u573e，\u4e00\u65e6\u56de\u6536\u5c31\u4f1a\u89e6\u53d1\u7a0b\u5e8f\u5d29\u6e83\u3002<\/p>\n

    SATB \u5982\u4f55\u62e6\u622a\u8fd9\u4e2a\u573a\u666f（\u5b8c\u6574\u5904\u7406\u6d41\u7a0b）<\/h5>\n

    \u5f53\u4e1a\u52a1\u7ebf\u7a0b\u6267\u884c A.field = null，\u5207\u65ad A\u2192B \u65f6：\u8d4b\u503c\u524d，\u5199\u524d\u5c4f\u969c（Pre-Write Barrier）\u89e6\u53d1，\u628a\u88ab\u4e22\u5f03\u7684\u65e7\u5f15\u7528\u5bf9\u8c61 B \u5b58\u5165 SATBMarkQueue\u3002<\/p>\n

    \u91cd\u70b9：\u5c4f\u969c\u6355\u83b7\u7684\u662f\u88ab\u8986\u76d6\u6d88\u5931\u7684\u5bf9\u8c61 B，\u800c\u4e0d\u662f\u65b0\u589e\u5f15\u7528\u7684\u76ee\u6807\u3002<\/p>\n

    \u5b58\u5165\u961f\u5217 \u4e0d\u7b49\u4e8e\u7acb\u523b\u626b\u63cf：<\/p>\n

      \n
    • \u5e76\u53d1\u6807\u8bb0\u9636\u6bb5，GC \u4e0d\u4f1a\u5b9e\u65f6\u5904\u7406 SATB \u961f\u5217，\u800c\u662f\u7ee7\u7eed\u6b63\u5e38\u904d\u5386\u5806；<\/li>\n
    • \u7b49\u5230 Final Mark（\u6700\u7ec8\u6807\u8bb0，\u77ed\u6682 STW \u9636\u6bb5）：- GC \u6682\u505c\u6240\u6709\u4e1a\u52a1\u7ebf\u7a0b；- \u904d\u5386\u6574\u4e2a SATBMarkQueue，\u53d6\u51fa\u961f\u5217\u91cc\u6240\u6709\u5bf9\u8c61（\u6848\u4f8b\u4e2d\u7684 B）；- \u4ee5\u8fd9\u4e9b\u5bf9\u8c61\u4e3a\u8d77\u70b9，\u6cbf\u7740\u5f15\u7528\u94fe\u5b8c\u6574\u9012\u5f52\u626b\u63cf\u3001\u6807\u8bb0\u6574\u6761\u5f15\u7528\u94fe\u4e0a\u6240\u6709\u5bf9\u8c61，\u6700\u7ec8\u4fdd\u8bc1 B \u4ee5\u53ca B \u5173\u8054\u7684\u6240\u6709\u5bf9\u8c61\u90fd\u88ab\u6807\u8bb0\u4e3a\u5b58\u6d3b，\u672c\u8f6e GC \u7edd\u4e0d\u4f1a\u56de\u6536\u3002<\/li>\n<\/ul>\n

      \u5bf9\u6bd4\u533a\u5206（\u91cd\u70b9\u4fee\u6b63，\u6e05\u6670\u533a\u5206\u65b0\u589e \/ \u5220\u9664\u4e24\u79cd\u884c\u4e3a）- CMS \u589e\u91cf\u66f4\u65b0：\u53ea\u76d1\u63a7\u65b0\u589e\u4ea7\u751f\u7684\u5f15\u7528；\u4e0d\u5904\u7406\u5355\u7eaf\u7684\u5f15\u7528\u5220\u9664\u3002- G1 SATB：\u53ea\u76d1\u63a7\u88ab\u5220\u9664\u3001\u88ab\u8986\u76d6\u7684\u65e7\u5f15\u7528；\u65b0\u589e\u5f15\u7528\u672c\u8eab\u4e0d\u9700\u8981\u5c4f\u969c\u5904\u7406\u3002<\/p>\n

      \u8865\u5145\u5173\u952e\u533a\u5206：\u5355\u7eaf\u65b0\u589e\u5f15\u7528\u4e0d\u4f1a\u5f15\u53d1\u6f0f\u6807；\u5355\u7eaf\u5220\u9664\u5f15\u7528\u4e5f\u4e0d\u4f1a\u5f15\u53d1\u6f0f\u6807；\u53ea\u6709\u300c\u65e7\u5f15\u7528\u65ad\u5f00 + \u65b0\u5f15\u7528\u6765\u81ea\u5df2\u7ecf\u626b\u63cf\u5b8c\u6210\u7684\u5bf9\u8c61\u300d\u7ec4\u5408\u5728\u4e00\u8d77，\u624d\u4f1a\u89e6\u53d1\u6f0f\u6807\u3002SATB \u901a\u8fc7\u5728\u5220\u9664\u5f15\u7528\u4fa7\u505a\u62e6\u622a，\u5b8c\u7f8e\u6253\u7834\u4e86\u8be5\u7ec4\u5408\u6761\u4ef6\u3002<\/p>\n

      \u4e8c\u3001TAMS：Top At Mark Start（\u6807\u8bb0\u542f\u52a8\u65f6\u7684\u5206\u914d\u9876\u7aef\u6307\u9488）<\/h3>\n

      SATB \u89e3\u51b3\u4e86\u8001\u5bf9\u8c61\u5f15\u7528\u53d8\u66f4\u7684\u6f0f\u6807\u95ee\u9898，\u4f46\u5bf9\u4e8e\u6807\u8bb0\u8fc7\u7a0b\u4e2d\u65b0\u521b\u5efa\u7684\u5bf9\u8c61，\u9700\u8981\u53e6\u4e00\u5957\u9ad8\u6548\u673a\u5236\u6765\u5e94\u5bf9，\u8fd9\u5c31\u662f TAMS\u3002<\/p>\n

      2.1 TAMS \u6570\u636e\u7ed3\u6784<\/h4>\n

      \u6bcf\u4e00\u4e2a Region \u5185\u90e8\u7ef4\u62a4\u4e24\u4e2a\u6307\u9488，\u6807\u8bb0\u9636\u6bb5\u542f\u52a8\u65f6\u8bb0\u5f55\u5f53\u65f6\u7684\u5185\u5b58\u5206\u914d\u4e0a\u9650\u3002\u6307\u9488\u987a\u5e8f\u5982\u4e0b：<\/p>\n

      bottom（Region \u8d77\u59cb\u5730\u5740） \u2192 prevTAMS \u2192 nextTAMS \u2192 top（\u5f53\u524d\u5df2\u5206\u914d\u4f4d\u7f6e） \u2192 end（Region \u672b\u5c3e）\u5e76\u53d1\u6807\u8bb0\u3010\u521a\u542f\u52a8\u4e00\u77ac\u95f4\u3011nextTAMS = top，\u4e24\u8005\u5730\u5740\u5b8c\u5168\u91cd\u5408；
      \n\u4f46\u662f\u6807\u8bb0\u5f00\u59cb\u4e4b\u540e，\u5e94\u7528\u7ebf\u7a0b\u4e0d\u65ad\u5206\u914d\u5bf9\u8c61，top \u6301\u7eed\u5411\u53f3\u79fb\u52a8，nextTAMS \u56fa\u5b9a\u4e0d\u52a8！<\/p>\n

        \n
      • nextTAMS（NTAMS）：\u672c\u8f6e\u5e76\u53d1\u6807\u8bb0\u542f\u52a8\u77ac\u95f4，\u8bb0\u5f55\u8be5 Region \u5f53\u65f6\u7684 top \u5730\u5740；<\/li>\n
      • prevTAMS：\u4e0a\u4e00\u8f6e\u5e76\u53d1\u6807\u8bb0\u8bb0\u5f55\u7684 nextTAMS，\u7528\u4e8e\u524d\u540e\u8f6e\u6807\u8bb0\u533a\u95f4\u5224\u65ad\u3002<\/li>\n<\/ul>\n

        TAMS \u628a Region \u5185\u5b58\u5206\u6210\u4e0a\u4e0b\u4e24\u5757：<\/p>\n

      • \u5730\u5740\u8303\u56f4 [bottom, nextTAMS)\u6807\u8bb0\u5f00\u59cb\u4e4b\u524d\u5206\u914d\u7684\u8001\u5bf9\u8c61，\u9700\u8981 GC \u9010\u4e2a\u904d\u5386\u3001\u8ffd\u8e2a\u5f15\u7528\u94fe，\u5224\u65ad\u662f\u5426\u5b58\u6d3b\u3002<\/li>\n
      • \u5730\u5740\u8303\u56f4 [nextTAMS, top)\u5e76\u53d1\u6807\u8bb0\u8fc7\u7a0b\u4e2d\u65b0\u5206\u914d\u7684\u5bf9\u8c61\u3002👉 \u76f4\u63a5\u9ed8\u8ba4\u5224\u5b9a\u4e3a\u5b58\u6d3b，\u4e0d\u9700\u8981 GC \u904d\u5386\u626b\u63cf！<\/li>\n

        2.2 \u4e3a\u4ec0\u4e48\u9700\u8981 TAMS？<\/h4>\n

        \u5e76\u53d1\u6807\u8bb0\u8fd0\u884c\u671f\u95f4，\u5e94\u7528\u7ebf\u7a0b\u4e0d\u65ad new \u65b0\u5bf9\u8c61\u3002\u5982\u679c\u6240\u6709\u8fd9\u4e9b\u5bf9\u8c61\u90fd\u8981\u53c2\u4e0e\u5b8c\u6574\u7684\u5f15\u7528\u904d\u5386，CPU \u5f00\u9500\u5c06\u5de8\u5927\u5230\u4e0d\u53ef\u63a5\u53d7\u3002<\/p>\n

        SATB \u89c4\u5219\u7ea6\u5b9a：\u6807\u8bb0\u5468\u671f\u5185\u65b0\u5efa\u7684\u5bf9\u8c61\u9ed8\u8ba4\u5168\u90e8\u5b58\u6d3b\u3002TAMS \u5c31\u662f\u8fd9\u6761\u89c4\u5219\u5728\u5185\u5b58\u7ba1\u7406\u4e0a\u7684\u843d\u5730\u5b9e\u73b0\u2014\u2014\u4e00\u6761\u7b80\u5355\u7684\u5730\u5740\u5206\u754c\u7ebf，\u7528\u4ee5\u5feb\u901f\u533a\u5206\u65b0\u65e7\u5bf9\u8c61，\u7701\u53bb\u6d77\u91cf\u626b\u63cf\u5de5\u4f5c\u3002<\/p>\n

        \u26a0\ufe0f \u91cd\u8981\u533a\u5206：TAMS \u53ea\u7ba1\u300c\u6807\u8bb0\u671f\u95f4\u65b0\u5efa\u5bf9\u8c61\u300d，\u4e0d\u89e3\u51b3\u4e0a\u9762\u6240\u8bf4\u7684\u5f15\u7528\u4fee\u6539\u9020\u6210\u7684\u6f0f\u6807\u95ee\u9898\u3002\u5f15\u7528\u4fee\u6539\u7684\u6f0f\u6807\u5b8c\u5168\u7531 SATB + \u5199\u524d\u5c4f\u969c\u8d1f\u8d23\u3002<\/p>\n

        \u4e09\u3001SATB + TAMS \u5b8c\u6574\u534f\u4f5c\u65f6\u5e8f<\/h3>\n

        \u6574\u4e2a\u5e76\u53d1\u6807\u8bb0\u5468\u671f\u4e2d，\u4e24\u8005\u534f\u8c03\u5de5\u4f5c\u5982\u4e0b：<\/p>\n

      • \u521d\u59cb\u6807\u8bb0（Initial Mark，\u77ed\u6682 STW）- \u904d\u5386\u6240\u6709 Region，\u628a\u6bcf\u4e2a Region \u5f53\u524d\u7684 top \u5730\u5740\u8d4b\u503c\u7ed9 nextTAMS，\u5237\u65b0 TAMS \u5206\u754c\u7ebf；- \u6b64\u65f6\u5efa\u7acb\u4e86\u5feb\u7167\u8fb9\u754c\u3002<\/li>\n
      • \u5e76\u53d1\u6807\u8bb0（Concurrent Marking）- \u8001\u5bf9\u8c61 [bottom, nextTAMS) ：\u6b63\u5e38\u904d\u5386\u5f15\u7528\u94fe；\u5f53\u65e7\u5f15\u7528\u88ab\u8986\u76d6\/\u5220\u9664\u65f6，\u89e6\u53d1\u5199\u524d\u5c4f\u969c，\u88ab\u4e22\u5f03\u7684\u5bf9\u8c61\u5b58\u5165 SATBMarkQueue；- \u65b0\u5bf9\u8c61 [nextTAMS, top) ：\u4f9d\u9760 TAMS \u8bc6\u522b，\u76f4\u63a5\u9ed8\u8ba4\u5b58\u6d3b，\u65e0\u9700\u626b\u63cf\u3002<\/li>\n
      • \u6700\u7ec8\u6807\u8bb0（Final Mark，\u77ed\u6682 STW）- \u6682\u505c\u6240\u6709\u4e1a\u52a1\u7ebf\u7a0b；- \u904d\u5386\u6e05\u7a7a SATBMarkQueue，\u9010\u4e2a\u53d6\u51fa\u961f\u5217\u5185\u7684\u5bf9\u8c61；- \u4ee5\u6bcf\u4e2a\u961f\u5217\u5bf9\u8c61\u4e3a\u8d77\u70b9，\u6cbf\u7740\u5f15\u7528\u94fe\u5b8c\u6574\u9012\u5f52\u6807\u8bb0，\u786e\u4fdd\u903b\u8f91\u5feb\u7167\u4e2d\u7684\u5bf9\u8c61\u65e0\u4e00\u9057\u6f0f\u3002<\/li>\n
      • Mixed GC- \u6839\u636e\u6807\u8bb0\u7ed3\u679c，\u6311\u9009\u5783\u573e\u6700\u591a\u7684\u82e5\u5e72 Region \u6267\u884c\u56de\u6536，\u65e2\u56de\u6536\u5e74\u8f7b\u4ee3\u4e5f\u56de\u6536\u90e8\u5206\u8001\u5e74\u4ee3\u3002<\/li>\n

        \u56db\u3001\u6a2a\u5411\u5bf9\u6bd4：SATB（G1） vs \u589e\u91cf\u66f4\u65b0（CMS）<\/h3>\n\n\u5bf9\u6bd4\u7ef4\u5ea6SATB（G1）\u589e\u91cf\u66f4\u65b0（CMS）<\/tr>\n\n\n\n\n\n\n
        \u76d1\u63a7\u884c\u4e3a<\/td>\n\u65e7\u5f15\u7528\u88ab\u5220\u9664\u3001\u8986\u76d6<\/td>\n\u7a0b\u5e8f\u65b0\u5efa\u5f15\u7528\u5173\u7cfb<\/td>\n<\/tr>\n
        \u4f7f\u7528\u5c4f\u969c<\/td>\n\u5199\u524d\u5c4f\u969c（Pre-Write Barrier）<\/td>\n\u5199\u540e\u5c4f\u969c（Post-Write Barrier）<\/td>\n<\/tr>\n
        \u5904\u7406\u65b9\u5f0f<\/td>\n\u88ab\u4e22\u5f03\u5bf9\u8c61\u5b58\u5165 SATB \u961f\u5217；\u6700\u7ec8\u6807\u8bb0 STW \u9636\u6bb5\u6cbf\u5f15\u7528\u94fe\u7edf\u4e00\u626b\u63cf\u6807\u8bb0<\/td>\n\u628a\u4ea7\u751f\u65b0\u5f15\u7528\u7684\u6e90\u5bf9\u8c61\u91cd\u65b0\u52a0\u5165\u6807\u8bb0\u961f\u5217，\u518d\u6b21\u904d\u5386<\/td>\n<\/tr>\n
        \u4ea7\u751f\u7ed3\u679c<\/td>\n\u4ea7\u751f\u6d6e\u52a8\u5783\u573e（\u672c\u8f6e\u4e0d\u56de\u6536）<\/td>\n\u65e0\u6d6e\u52a8\u5783\u573e（\u91cd\u65b0\u6807\u8bb0\u53ef\u4fee\u6b63）<\/td>\n<\/tr>\n
        \u914d\u5957\u7ec4\u4ef6<\/td>\nTAMS \u533a\u5206\u6807\u8bb0\u671f\u95f4\u65b0\u5efa\u5bf9\u8c61<\/td>\n\u4e0d\u5b58\u5728 TAMS（\u65b0\u751f\u4ee3\u7531 Young GC \u8d1f\u8d23）<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        \u4e94\u3001\u9762\u8bd5\u7cbe\u7b80\u80cc\u8bf5\u7248<\/h3>\n

        SATB \u662f G1 \u5e76\u53d1\u6807\u8bb0\u91c7\u7528\u7684\u7b97\u6cd5\u3002\u5e76\u53d1\u6807\u8bb0\u542f\u52a8\u77ac\u95f4\u751f\u6210\u903b\u8f91\u5feb\u7167，\u5feb\u7167\u5185\u5b58\u5728\u7684\u5bf9\u8c61\u672c\u8f6e\u89c6\u4f5c\u5b58\u6d3b；\u5f53\u65e7\u5f15\u7528\u88ab\u8986\u76d6\/\u5220\u9664，\u5199\u524d\u5c4f\u969c\u6355\u83b7\u88ab\u4e22\u5f03\u7684\u5f15\u7528\u5b58\u5165 SATBMarkQueue，\u7b49\u5230\u6700\u7ec8\u6807\u8bb0\u9636\u6bb5 STW，\u904d\u5386\u961f\u5217，\u4ee5\u961f\u5217\u5bf9\u8c61\u4e3a\u8d77\u70b9\u6cbf\u7740\u5f15\u7528\u94fe\u5b8c\u6574\u6807\u8bb0，\u9632\u6b62\u5b58\u6d3b\u5bf9\u8c61\u88ab\u9519\u8bef\u56de\u6536，\u4ee3\u4ef7\u662f\u4ea7\u751f\u6d6e\u52a8\u5783\u573e\u3002<\/p>\n

        TAMS \u662f\u6bcf\u4e2a Region \u5185\u90e8\u7684\u5730\u5740\u6307\u9488，\u521d\u59cb\u6807\u8bb0\u9636\u6bb5\u8bb0\u5f55\u6807\u8bb0\u542f\u52a8\u65f6\u523b\u7684\u5206\u914d\u4f4d\u7f6e；TAMS \u5206\u754c\u7ebf\u4e4b\u540e\u662f\u6807\u8bb0\u5468\u671f\u4e2d\u65b0\u521b\u5efa\u7684\u5bf9\u8c61，\u76f4\u63a5\u9ed8\u8ba4\u5b58\u6d3b，\u4e0d\u7528\u904d\u5386\u6807\u8bb0\u3002<\/p>\n

        \u534f\u4f5c\u5173\u7cfb：SATB \u8d1f\u8d23\u5904\u7406\u8001\u5bf9\u8c61\u5f15\u7528\u53d8\u66f4\u7684\u6f0f\u6807\u95ee\u9898；TAMS \u7528\u6765\u533a\u5206\u6807\u8bb0\u671f\u95f4\u65b0\u521b\u5efa\u5bf9\u8c61；\u4e8c\u8005\u914d\u5408，\u4fdd\u969c\u5e76\u53d1\u6807\u8bb0\u7684\u6b63\u786e\u6027\u3002<\/p>\n

        \u516d\u3001\u4e24\u4e2a\u6df1\u5ea6\u8ffd\u95ee<\/h3>\n

        \u8ffd\u95ee\u4e00：\u4e3a\u4ec0\u4e48 SATB \u4e0d\u80fd\u533a\u5206\u201c\u4e34\u65f6\u65ad\u5f00\u201d\u4e0e\u201c\u6c38\u4e45\u5220\u9664\u201d？<\/h4>\n

        \u4f60\u53ef\u80fd\u4f1a\u60f3：\u65e2\u7136\u5bf9\u8c61 B \u7684\u5f15\u7528\u65ad\u5f00\u4e86，\u4e3a\u4ec0\u4e48 SATB \u4e0d\u8fdb\u4e00\u6b65\u5224\u65ad B \u662f\u5426\u771f\u7684\u53d8\u6210\u4e86\u5783\u573e？<\/p>\n

        \u539f\u56e0\u5728\u4e8e\u5e76\u53d1\u573a\u666f\u4e0b\u65e0\u6cd5\u96f6\u6210\u672c\u5730\u7cbe\u786e\u533a\u5206\u3002\u5f15\u7528\u65ad\u5f00\u7684\u90a3\u4e00\u523b，JVM \u6839\u672c\u65e0\u6cd5\u9884\u77e5\u672a\u6765 0.1ms \u5185\u7528\u6237\u7ebf\u7a0b\u662f\u5426\u4f1a\u91cd\u65b0\u5efa\u7acb\u5f15\u7528\u3002<\/p>\n

          \n
        • \u82e5\u9009\u62e9\u201c\u5192\u8fdb\u56de\u6536\u201d，\u4e00\u65e6\u5f15\u7528\u6062\u590d\u5c31\u4f1a\u5bfc\u81f4 JVM \u5d29\u6e83；<\/li>\n
        • \u82e5\u9009\u62e9\u201c\u5b9e\u65f6\u626b\u63cf\u5168\u5806\u5224\u65ad\u201d，\u5219\u4f1a\u4e25\u91cd\u62d6\u6162\u5e76\u53d1\u6807\u8bb0\u8fdb\u5ea6，\u505c\u987f\u65f6\u95f4\u4e0d\u53ef\u63a7\u3002<\/li>\n<\/ul>\n

          \u56e0\u6b64 SATB \u91c7\u7528\u4fdd\u5b88\u7b56\u7565\u2014\u2014\u5b81\u53ef\u653e\u8fc7，\u4e0d\u53ef\u9519\u6740\u3002\u8fd9\u662f\u5e76\u53d1 GC \u4e2d\u5178\u578b\u7684\u6027\u80fd\u4e0e\u5b89\u5168\u6743\u8861\u3002<\/p>\n

          \u8ffd\u95ee\u4e8c：CMS \u4e3a\u4ec0\u4e48\u6ca1\u6709 TAMS \u8fd9\u6837\u7684\u673a\u5236？<\/h4>\n

          CMS \u6ca1\u6709\u7c7b\u4f3c TAMS \u7684\u673a\u5236，\u6839\u672c\u539f\u56e0\u5728\u4e8e\u5206\u4ee3\u8bbe\u8ba1\u5dee\u5f02：<\/p>\n

            \n
          • CMS \u4ec5\u8d1f\u8d23\u8001\u5e74\u4ee3\u7684\u56de\u6536，\u5e76\u53d1\u6807\u8bb0\u65f6\u65b0\u521b\u5efa\u7684\u5bf9\u8c61\u5168\u90e8\u5206\u914d\u5728\u65b0\u751f\u4ee3（Young Gen）；<\/li>\n
          • \u65b0\u751f\u4ee3\u5bf9\u8c61\u5b8c\u5168\u7531\u72ec\u7acb\u7684 Young GC \u8d1f\u8d23，CMS \u6839\u672c\u4e0d\u7528\u63d2\u624b，\u81ea\u7136\u4e0d\u9700\u8981\u5728 Region \u5185\u5212\u5206\u6807\u8bb0\u8fb9\u754c\u3002<\/li>\n<\/ul>\n

            \u800c G1 \u7684 Region \u53ef\u4ee5\u7075\u6d3b\u5212\u4f5c\u65b0\u751f\u4ee3\u6216\u8001\u5e74\u4ee3，\u65b0\u5206\u914d\u7684\u5bf9\u8c61\u53ef\u80fd\u76f4\u63a5\u8fdb\u5165\u6b63\u5728\u5e76\u53d1\u6807\u8bb0\u7684 Region \u4e2d，\u56e0\u6b64\u5fc5\u987b\u6709 TAMS \u8fd9\u79cd\u673a\u5236\u6765\u5212\u6e05\u754c\u9650，\u9ed8\u8ba4\u5b58\u6d3b，\u907f\u514d\u5927\u91cf\u65e0\u6548\u626b\u63cf\u3002<\/p>\n

            \u603b\u7ed3<\/h3>\n
              \n
            • SATB \u4ee5\u201c\u903b\u8f91\u5feb\u7167\u201d\u4e3a\u6838\u5fc3，\u901a\u8fc7\u5728\u5220\u9664\u5f15\u7528\u4fa7\u8bb0\u5f55\u65e7\u5bf9\u8c61，\u4fdd\u969c\u5e76\u53d1\u5b89\u5168；<\/li>\n
            • TAMS \u7528\u4e00\u6761\u7b80\u5355\u7684\u5730\u5740\u6307\u9488，\u5c06\u6807\u8bb0\u671f\u95f4\u7684\u65b0\u5bf9\u8c61\u9ed8\u8ba4\u6807\u8bb0\u4e3a\u5b58\u6d3b，\u6781\u5927\u964d\u4f4e\u626b\u63cf\u5f00\u9500；<\/li>\n
            • \u4e24\u8005\u4e00\u4e2a\u89e3\u51b3\u201c\u5f15\u7528\u53d8\u66f4\u6f0f\u6807\u201d，\u4e00\u4e2a\u89e3\u51b3\u201c\u65b0\u5bf9\u8c61\u8bc6\u522b\u201d，\u5171\u540c\u652f\u6491\u8d77 G1 \u9ad8\u6548\u3001\u6b63\u786e\u7684\u5e76\u53d1\u6807\u8bb0\u3002<\/li>\n<\/ul>\n

              \u7406\u89e3 SATB + TAMS，\u5c31\u6293\u4f4f\u4e86 G1 \u5e76\u53d1\u6807\u8bb0\u7684\u7075\u9b42\u3002\u5e0c\u671b\u672c\u6587\u80fd\u5e2e\u4f60\u5f7b\u5e95\u626b\u6e05\u8fd9\u4e00\u6838\u5fc3\u77e5\u8bc6\u70b9\u7684\u969c\u788d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

              \u524d\u8a00
              \n\u5728 JVM \u5783\u573e\u56de\u6536\u9886\u57df，G1（Garbage First） \u51ed\u501f\u5176\u53ef\u9884\u6d4b\u7684\u505c\u987f\u65f6\u95f4\u548c\u4f18\u79c0\u7684\u541e\u5410\u8868\u73b0，\u5df2\u7ecf\u6210\u4e3a\u670d\u52a1\u7aef\u5e94\u7528\u7684\u9996\u9009\u6536\u96c6\u5668\u4e4b\u4e00\u3002\u800c\u652f\u6491 G1 \u6b63\u786e\u8fdb\u884c\u5e76\u53d1\u6807\u8bb0\u7684\u6838\u5fc3，\u5c31\u662f SATB（Snapshot At The Beginning） \u7b97\u6cd5\u4ee5\u53ca TAMS（Top At Mark Start） \u6307\u9488\u673a\u5236\u3002
              \n\u4e00\u3001SATB：Sn<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,426],"topic":[],"class_list":["post-88761","post","type-post","status-publish","format-standard","hentry","category-server","tag-java","tag-jvm"],"yoast_head":"\nG1 \u5783\u573e\u56de\u6536\u5668 \uff1aSATB + TAMS\u6838\u5fc3\u673a\u5236\u6df1\u5ea6\u89e3\u6790 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/88761.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"G1 \u5783\u573e\u56de\u6536\u5668 \uff1aSATB + TAMS\u6838\u5fc3\u673a\u5236\u6df1\u5ea6\u89e3\u6790 - 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