{"id":241,"date":"2026-09-06T00:43:33","date_gmt":"2026-09-05T16:43:33","guid":{"rendered":"https:\/\/www.ziliaochi.cn\/index.php\/2026\/09\/06\/interview-jvm-gc\/"},"modified":"2026-09-06T00:43:33","modified_gmt":"2026-09-05T16:43:33","slug":"interview-jvm-gc","status":"publish","type":"post","link":"https:\/\/www.ziliaochi.cn\/index.php\/2026\/09\/06\/interview-jvm-gc\/","title":{"rendered":"JVM \u4e0e GC \u9762\u8bd5 25 \u95ee\uff1a\u5185\u5b58\u7ed3\u6784\u3001\u56de\u6536\u5668\u9009\u578b\u4e0e\u7ebf\u4e0a\u6392\u67e5"},"content":{"rendered":"
\n
\u5173\u952e\u8bcd<\/span>JVM \u9762\u8bd5\u3001GC \u7b97\u6cd5\u3001G1\u3001ZGC\u3001Shenandoah\u3001\u5185\u5b58\u6cc4\u6f0f\u3001JDK 25<\/div>\n
\n
\u76ee\u5f55<\/div>\n
    \n
  1. \u4e00\u3001\u8fd0\u884c\u65f6\u6570\u636e\u533a\uff1a\u5148\u5206\u6e05\u54ea\u4e9b\u5171\u4eab\u3001\u54ea\u4e9b\u79c1\u6709<\/a><\/li>\n
  2. \u4e8c\u3001\u5bf9\u8c61\u751f\u547d\u5468\u671f\uff1a\u4e09\u4e2a\u5fc5\u8003\u9898<\/a><\/li>\n
  3. \u4e09\u3001GC \u7b97\u6cd5\uff1a\u4e09\u4e2a\u7b97\u6cd5\u5404\u81ea\u7684\u4ee3\u4ef7<\/a><\/li>\n
  4. \u56db\u3001\u56de\u6536\u5668\u9009\u578b\uff1a2026 \u5e74\u8be5\u7b54\u54ea\u4e9b<\/a><\/li>\n
  5. \u4e94\u3001\u8c03\u4f18\u4e0e\u6392\u67e5\uff1a\u9762\u8bd5\u5b98\u771f\u6b63\u60f3\u542c\u7684\u90e8\u5206<\/a><\/li>\n
  6. \u516d\u3001\u5c0f\u7ed3<\/a><\/li>\n<\/ol>\n<\/div>\n

    JVM \u662f Java \u540e\u7aef\u9762\u8bd5\u91cc\u6700\u80fd\u533a\u5206”\u7528\u8fc7”\u548c”\u61c2”\u7684\u4e00\u5757<\/strong>\u3002\u591a\u6570\u4eba\u80fd\u80cc\u51fa”\u5806\u5206\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3”\uff0c\u4f46\u4e00\u8ffd\u95ee”\u5bf9\u8c61\u4ec0\u4e48\u65f6\u5019\u8fdb\u5165\u8001\u5e74\u4ee3””G1 \u4e3a\u4ec0\u4e48\u80fd\u8bbe\u505c\u987f\u76ee\u6807””\u7ebf\u4e0a Full GC \u9891\u7e41\u4f60\u600e\u4e48\u6392\u67e5”\uff0c\u5c31\u9732\u602f\u4e86\u3002<\/p>\n

    \u672c\u6587\u6309\u5185\u5b58\u7ed3\u6784 \u2192 \u5bf9\u8c61\u751f\u547d\u5468\u671f \u2192 GC \u7b97\u6cd5 \u2192 \u56de\u6536\u5668\u9009\u578b \u2192 \u8c03\u4f18\u6392\u67e5<\/strong>\u4e94\u6bb5\u7ec4\u7ec7\uff0c\u5e76\u7ed3\u5408 JDK 25\uff082025 \u5e74 9 \u6708\u53d1\u5e03\u7684\u6700\u65b0 LTS\uff09\u7684\u65b0\u53d8\u5316\uff0c\u628a 2026 \u5e74\u8be5\u7b54\u5230\u7684\u70b9\u8865\u9f50\u3002<\/p>\n

    \"Full
    JVM \u6392\u67e5\u6d41\u7a0b\uff1a\u6b62\u8840 \u2192 \u4fdd\u7559\u73b0\u573a \u2192 \u770b\u8d8b\u52bf \u2192 \u770b\u5bf9\u8c61 \u2192 \u5b9a\u4f4d\u4ee3\u7801<\/figcaption><\/figure>\n

    \u4e00\u3001\u8fd0\u884c\u65f6\u6570\u636e\u533a\uff1a\u5148\u5206\u6e05\u54ea\u4e9b\u5171\u4eab\u3001\u54ea\u4e9b\u79c1\u6709<\/h2>\n

    Q1\uff1aJVM \u5185\u5b58\u5206\u54ea\u51e0\u5757\uff1f<\/h3>\n\n\n\n\n\n\n\n\n\n
    \u533a\u57df<\/th>\n\u7ebf\u7a0b\u5171\u4eab<\/th>\n\u5b58\u4ec0\u4e48<\/th>\n\u53ef\u80fd\u629b\u4ec0\u4e48\u9519<\/th>\n<\/tr>\n<\/thead>\n
    \u7a0b\u5e8f\u8ba1\u6570\u5668<\/td>\n\u79c1\u6709<\/td>\n\u5f53\u524d\u6307\u4ee4\u5730\u5740<\/td>\n\u65e0\uff08\u552f\u4e00\u4e0d OOM \u7684\u533a\u57df\uff09<\/td>\n<\/tr>\n
    \u865a\u62df\u673a\u6808<\/td>\n\u79c1\u6709<\/td>\n\u6808\u5e27\uff08\u5c40\u90e8\u53d8\u91cf\u8868\u3001\u64cd\u4f5c\u6570\u6808\uff09<\/td>\nStackOverflowError \/ OOM<\/td>\n<\/tr>\n
    \u672c\u5730\u65b9\u6cd5\u6808<\/td>\n\u79c1\u6709<\/td>\nNative \u65b9\u6cd5<\/td>\n\u540c\u4e0a<\/td>\n<\/tr>\n
    \u5806<\/td>\n\u5171\u4eab<\/strong><\/td>\n\u5bf9\u8c61\u5b9e\u4f8b\u3001\u6570\u7ec4<\/td>\nOutOfMemoryError: Java heap space<\/code><\/td>\n<\/tr>\n
    \u65b9\u6cd5\u533a \/ \u5143\u7a7a\u95f4<\/td>\n\u5171\u4eab<\/strong><\/td>\n\u7c7b\u5143\u4fe1\u606f\u3001\u5e38\u91cf\u3001\u9759\u6001\u53d8\u91cf\u3001JIT \u4ee3\u7801\u7f13\u5b58<\/td>\nOOM: Metaspace<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u9ad8\u9891\u8ffd\u95ee\uff1a\u5143\u7a7a\u95f4\uff08Metaspace\uff09\u548c\u6c38\u4e45\u4ee3\uff08PermGen\uff09\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/strong><\/p>\n

      \n
    • \u6c38\u4e45\u4ee3<\/strong>\uff08JDK 7 \u53ca\u4ee5\u524d\uff09\uff1a\u5728\u5806\u5185\uff0c\u5927\u5c0f\u53d7 -XX:MaxPermSize<\/code> \u9650\u5236\uff0c\u5bb9\u6613 OOM\u3002<\/li>\n
    • \u5143\u7a7a\u95f4<\/strong>\uff08JDK 8 \u8d77\uff09\uff1a\u4f7f\u7528\u672c\u5730\u5185\u5b58<\/strong>\uff0c\u7406\u8bba\u4e0a\u53ea\u53d7\u673a\u5668\u5185\u5b58\u9650\u5236\uff0c\u9ed8\u8ba4\u503c\u6309\u9700\u6269\u5c55\u3002<\/li>\n
    • \u8fc1\u79fb\u5e26\u6765\u7684\u5b9e\u9645\u53d8\u5316\uff1a\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u548c\u9759\u6001\u53d8\u91cf\u79fb\u5230\u4e86\u5806\u91cc<\/strong>\uff08JDK 7 \u5c31\u5f00\u59cb\u8fc1\u79fb\uff09\uff0c\u7c7b\u5143\u4fe1\u606f\u7559\u5728\u5143\u7a7a\u95f4\u3002<\/li>\n
    • \u6ce8\u610f\uff1a\u5143\u7a7a\u95f4\u4e0d\u53d7\u9650\u4e0d\u4ee3\u8868\u6ca1\u98ce\u9669\uff0c\u52a8\u6001\u751f\u6210\u5927\u91cf\u7c7b\uff08CGLib\u3001\u53cd\u5c04\u3001Groovy \u811a\u672c\uff09\u4ecd\u4f1a\u6491\u7206\u672c\u5730\u5185\u5b58<\/strong>\u3002<\/li>\n<\/ul>\n

      Q2\uff1a\u5bf9\u8c61\u5728\u5185\u5b58\u91cc\u957f\u4ec0\u4e48\u6837\uff1f<\/h3>\n

      \u5bf9\u8c61\u5934\uff08Mark Word + \u7c7b\u578b\u6307\u9488\uff09+ \u5b9e\u4f8b\u6570\u636e + \u5bf9\u9f50\u586b\u5145\u3002Mark Word \u91cc\u5b58\u7740\u54c8\u5e0c\u7801\u3001GC \u5206\u4ee3\u5e74\u9f84\u3001\u9501\u72b6\u6001\u6807\u5fd7\u2014\u2014\u8fd9\u4e5f\u662f synchronized<\/code> \u9501\u5347\u7ea7\uff08\u504f\u5411\u9501 \u2192 \u8f7b\u91cf\u7ea7\u9501 \u2192 \u91cd\u91cf\u7ea7\u9501\uff09\u7684\u72b6\u6001\u8f7d\u4f53\u3002<\/strong><\/p>\n

      \n

      2026 \u5e74\u52a0\u5206\u70b9\uff1aJDK 25 \u7684\u7d27\u51d1\u5bf9\u8c61\u5934\uff08JEP 519\uff09\u5df2\u8f6c\u6b63<\/strong>\uff0c\u901a\u8fc7 -XX:+UseCompactObjectHeaders<\/code> \u53ef\u628a 64 \u4f4d\u5e73\u53f0\u4e0a\u7684\u5bf9\u8c61\u5934\u4ece 96\u2013128 bit \u538b\u7f29\u5230 64 bit<\/strong>\u3002\u5bf9\u8c61\u5bc6\u96c6\u578b\u7684\u8d1f\u8f7d\u901a\u5e38\u80fd\u7701\u4e0b\u53ef\u89c2\u5806\u5185\u5b58\u5e76\u6539\u5584\u6570\u636e\u5c40\u90e8\u6027\uff0c\u76f8\u5f53\u4e8e\u4e00\u6b21”\u514d\u8d39\u5347\u7ea7”\u3002\u843d\u5730\u524d\u6ce8\u610f\u4e0e\u6240\u7528 GC \u7ec4\u5408\u7684\u517c\u5bb9\u6027\uff0c\u9700\u5728\u76ee\u6807\u73af\u5883\u5b9e\u6d4b\u9a8c\u8bc1\u3002<\/strong><\/p>\n<\/blockquote>\n

      \u4e8c\u3001\u5bf9\u8c61\u751f\u547d\u5468\u671f\uff1a\u4e09\u4e2a\u5fc5\u8003\u9898<\/h2>\n

      Q3\uff1a\u5bf9\u8c61\u600e\u4e48\u5224\u65ad”\u5df2\u6b7b”\uff1f<\/h3>\n

      \u4e0d\u662f\u5f15\u7528\u8ba1\u6570\u6cd5\uff0c\u662f\u53ef\u8fbe\u6027\u5206\u6790\u3002<\/strong>\u4ece GC Roots \u51fa\u53d1\uff0c\u80fd\u88ab\u5f15\u7528\u94fe\u5230\u8fbe\u7684\u5bf9\u8c61\u662f\u5b58\u6d3b\u7684\uff0c\u5176\u4f59\u5224\u5b9a\u4e3a\u53ef\u56de\u6536\u3002<\/p>\n

      GC Roots \u5305\u62ec\uff1a\u865a\u62df\u673a\u6808\/\u672c\u5730\u65b9\u6cd5\u6808\u4e2d\u7684\u5f15\u7528\u3001\u65b9\u6cd5\u533a\u4e2d\u9759\u6001\u5c5e\u6027\u548c\u5e38\u91cf\u7684\u5f15\u7528\u3001\u88ab\u540c\u6b65\u9501\u6301\u6709\u7684\u5bf9\u8c61\u3001JVM \u5185\u90e8\u5f15\u7528\uff08\u5982\u7cfb\u7edf\u7c7b\u52a0\u8f7d\u5668\u3001\u5f02\u5e38\u5bf9\u8c61\uff09\u3002<\/p>\n

      \u8ffd\u95ee”\u5f15\u7528\u8ba1\u6570\u6cd5\u4e3a\u4ec0\u4e48\u4e0d\u7528<\/strong>“\u2014\u2014\u56e0\u4e3a\u5b83\u89e3\u51b3\u4e0d\u4e86\u5faa\u73af\u5f15\u7528<\/strong>\uff1aA \u5f15\u7528 B\u3001B \u5f15\u7528 A\uff0c\u4e24\u8005\u8ba1\u6570\u90fd\u4e0d\u4e3a 0\uff0c\u4f46\u5916\u90e8\u5df2\u7ecf\u6ca1\u4eba\u7528\u4e86\u3002<\/p>\n

      Q4\uff1a\u56db\u79cd\u5f15\u7528\u7c7b\u578b\u5206\u522b\u7528\u5728\u4ec0\u4e48\u5730\u65b9\uff1f<\/h3>\n
        \n
      • \u5f3a\u5f15\u7528<\/strong>\uff1a\u9ed8\u8ba4\u3002\u53ea\u8981\u5b58\u5728\uff0cGC \u7edd\u4e0d\u56de\u6536\u3002<\/li>\n
      • \u8f6f\u5f15\u7528\uff08SoftReference\uff09<\/strong>\uff1a\u5185\u5b58\u4e0d\u8db3\u65f6\u624d\u56de\u6536<\/strong>\u3002\u9002\u5408\u505a\u5185\u5b58\u654f\u611f\u7684\u7f13\u5b58\u3002<\/li>\n
      • \u5f31\u5f15\u7528\uff08WeakReference\uff09<\/strong>\uff1a\u4e0b\u4e00\u6b21 GC \u5c31\u56de\u6536<\/strong>\u3002ThreadLocalMap<\/code>\u3001WeakHashMap<\/code> \u7528\u5b83\u6765\u907f\u514d\u5185\u5b58\u6cc4\u6f0f\u3002<\/li>\n
      • \u865a\u5f15\u7528\uff08PhantomReference\uff09<\/strong>\uff1a\u5b8c\u5168\u4e0d\u5f71\u54cd\u751f\u547d\u5468\u671f\uff0c\u53ea\u7528\u4e8e\u5728\u5bf9\u8c61\u88ab\u56de\u6536\u65f6\u6536\u5230\u901a\u77e5\u3002\u5178\u578b\u7528\u9014\u662f\u5806\u5916\u5185\u5b58\u7684\u6e05\u7406<\/strong>\uff08DirectByteBuffer \u7684 Cleaner\uff09\u3002<\/li>\n<\/ul>\n
        \n

        \u9ad8\u9891\u8fde\u73af\u95ee\uff1a”ThreadLocal \u4e3a\u4ec0\u4e48\u4f1a\u5185\u5b58\u6cc4\u6f0f\uff1f<\/strong>“\u2014\u2014ThreadLocalMap<\/code> \u7684 key \u662f\u5f31\u5f15\u7528\uff0cvalue \u662f\u5f3a\u5f15\u7528\u3002key \u88ab GC \u56de\u6536\u540e\u53d8\u6210 null<\/code>\uff0c\u4f46 value \u4ecd\u88ab Entry<\/code> \u5f3a\u5f15\u7528\u7740\uff0c\u800c Entry<\/code> \u53c8\u5728\u7ebf\u7a0b\u7684 map \u91cc\u3002\u5982\u679c\u7ebf\u7a0b\u957f\u671f\u4e0d\u7ed3\u675f\uff08\u7ebf\u7a0b\u6c60\u573a\u666f\u5c24\u5176\u4e25\u91cd<\/strong>\uff09\uff0cvalue \u5c31\u6c38\u8fdc\u65e0\u6cd5\u56de\u6536\u3002\u89e3\u6cd5\uff1a\u7528\u5b8c\u5fc5\u987b\u8c03\u7528 remove()<\/code>\u3002<\/strong><\/p>\n<\/blockquote>\n

        Q5\uff1a\u5bf9\u8c61\u4ec0\u4e48\u65f6\u5019\u8fdb\u5165\u8001\u5e74\u4ee3\uff1f<\/h3>\n

        \u4e09\u6761\u8def\u5f84\uff1a<\/p>\n

          \n
        1. \u5e74\u9f84\u9608\u503c<\/strong>\uff1a\u6bcf\u71ac\u8fc7\u4e00\u6b21 Minor GC \u5e74\u9f84 +1\uff0c\u9ed8\u8ba4 15\uff08-XX:MaxTenuringThreshold<\/code>\uff09\u540e\u664b\u5347\u3002<\/li>\n
        2. \u52a8\u6001\u5e74\u9f84\u5224\u5b9a<\/strong>\uff1aSurvivor \u533a\u4e2d\u540c\u9f84\u5bf9\u8c61\u603b\u5927\u5c0f\u8d85\u8fc7 Survivor \u4e00\u534a<\/strong>\u65f6\uff0c\u5927\u4e8e\u7b49\u4e8e\u8be5\u5e74\u9f84\u7684\u5bf9\u8c61\u76f4\u63a5\u8fdb\u5165\u8001\u5e74\u4ee3\u3002\u8fd9\u6761\u7ecf\u5e38\u88ab\u6f0f\u7b54\u3002<\/strong><\/li>\n
        3. \u5927\u5bf9\u8c61\u76f4\u63a5\u8fdb\u8001\u5e74\u4ee3<\/strong>\uff1a\u8d85\u8fc7 -XX:PretenureSizeThreshold<\/code> \u7684\u5bf9\u8c61\uff08\u5178\u578b\u662f\u957f\u6570\u7ec4\u3001\u5927\u5b57\u7b26\u4e32\uff09\u76f4\u63a5\u5728\u8001\u5e74\u4ee3\u5206\u914d\uff0c\u907f\u514d\u5728 Eden \u548c Survivor \u4e4b\u95f4\u53cd\u590d\u62f7\u8d1d\u3002<\/li>\n<\/ol>\n

          \u8fd8\u6709\u4e00\u6761\u7a7a\u95f4\u5206\u914d\u62c5\u4fdd<\/strong>\uff1aMinor GC \u524d JVM \u4f1a\u68c0\u67e5\u8001\u5e74\u4ee3\u5269\u4f59\u7a7a\u95f4\u662f\u5426\u5927\u4e8e\u65b0\u751f\u4ee3\u5bf9\u8c61\u603b\u5927\u5c0f\uff08\u6216\u5386\u6b21\u664b\u5347\u7684\u5e73\u5747\u5927\u5c0f\uff09\uff0c\u4e0d\u591f\u5219\u5148\u89e6\u53d1\u4e00\u6b21 Full GC\u3002<\/p>\n

          \u4e09\u3001GC \u7b97\u6cd5\uff1a\u4e09\u4e2a\u7b97\u6cd5\u5404\u81ea\u7684\u4ee3\u4ef7<\/h2>\n

          Q6\uff1a\u4e09\u79cd\u57fa\u7840\u7b97\u6cd5\u53ca\u4f18\u52a3\uff1f<\/h3>\n\n\n\n\n\n\n\n
          \u7b97\u6cd5<\/th>\n\u505a\u6cd5<\/th>\n\u4f18\u70b9<\/th>\n\u7f3a\u70b9<\/th>\n\u9002\u7528<\/th>\n<\/tr>\n<\/thead>\n
          \u6807\u8bb0-\u6e05\u9664<\/td>\n\u6807\u8bb0\u540e\u76f4\u63a5\u6e05\u9664<\/td>\n\u7b80\u5355\uff0c\u4e0d\u79fb\u52a8\u5bf9\u8c61<\/td>\n\u4ea7\u751f\u5185\u5b58\u788e\u7247<\/strong><\/td>\n\u8001\u5e74\u4ee3 CMS \u7684\u5e76\u53d1\u6e05\u7406\u9636\u6bb5<\/td>\n<\/tr>\n
          \u590d\u5236<\/td>\n\u5b58\u6d3b\u5bf9\u8c61\u590d\u5236\u5230\u53e6\u4e00\u534a\u7a7a\u95f4<\/td>\n\u65e0\u788e\u7247\uff0c\u901f\u5ea6\u5feb<\/td>\n\u6d6a\u8d39\u4e00\u534a\u7a7a\u95f4<\/strong><\/td>\n\u65b0\u751f\u4ee3\uff08Eden:Survivor = 8:1:1\uff09<\/td>\n<\/tr>\n
          \u6807\u8bb0-\u6574\u7406<\/td>\n\u6807\u8bb0\u540e\u5b58\u6d3b\u5bf9\u8c61\u5f80\u4e00\u7aef\u79fb\u52a8<\/td>\n\u65e0\u788e\u7247\u3001\u4e0d\u6d6a\u8d39\u7a7a\u95f4<\/td>\n\u79fb\u52a8\u5bf9\u8c61\u9700\u8981 STW \u4e14\u66f4\u65b0\u5f15\u7528<\/strong><\/td>\n\u8001\u5e74\u4ee3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          \u5173\u952e\u7406\u89e3\uff1a\u590d\u5236\u7b97\u6cd5\u5728”\u5927\u90e8\u5206\u5bf9\u8c61\u90fd\u4f1a\u6b7b”\u7684\u524d\u63d0\u4e0b\u624d\u5212\u7b97<\/strong>\u3002\u65b0\u751f\u4ee3\u5bf9\u8c61\u671d\u751f\u5915\u6b7b\uff08\u901a\u5e38 98% \u4ee5\u4e0a\u6d3b\u4e0d\u8fc7\u4e00\u6b21 GC\uff09\uff0c\u6240\u4ee5\u53ea\u9700\u8981\u4fdd\u7559\u5c11\u91cf\u5b58\u6d3b\u5bf9\u8c61\uff0c10% \u7684 Survivor \u7a7a\u95f4\u5c31\u591f\u4e86\u3002\u8001\u5e74\u4ee3\u5bf9\u8c61\u5b58\u6d3b\u7387\u9ad8\uff0c\u7528\u590d\u5236\u5c31\u5f97\u590d\u5236\u4e00\u5927\u5806\uff0c\u6240\u4ee5\u6539\u7528\u6807\u8bb0-\u6574\u7406\u3002<\/p>\n

          \u56db\u3001\u56de\u6536\u5668\u9009\u578b\uff1a2026 \u5e74\u8be5\u7b54\u54ea\u4e9b<\/h2>\n

          Q7\uff1a\u4e3b\u6d41\u56de\u6536\u5668\u600e\u4e48\u9009\uff1f<\/h3>\n
            \n
          • Serial \/ Serial Old<\/strong>\uff1a\u5355\u7ebf\u7a0b\uff0cSTW \u5168\u7a0b\u6682\u505c\u3002\u53ea\u9002\u5408\u5ba2\u6237\u7aef\u6216\u6781\u5c0f\u5806\uff08\u767e MB \u7ea7\uff09\u3002<\/li>\n
          • Parallel \/ Parallel Old<\/strong>\uff1a\u541e\u5410\u91cf\u4f18\u5148<\/strong>\uff0c\u591a\u7ebf\u7a0b\u5e76\u884c\u56de\u6536\u4f46 STW\u3002JDK 8 \u9ed8\u8ba4\u3002\u9002\u5408\u6279\u5904\u7406\u3001\u79bb\u7ebf\u8ba1\u7b97\u8fd9\u7c7b\u4e0d\u5728\u4e4e\u5355\u6b21\u505c\u987f\u3001\u53ea\u5728\u4e4e\u603b\u541e\u5410<\/strong>\u7684\u573a\u666f\u3002<\/li>\n
          • CMS<\/strong>\uff1a\u5e76\u53d1\u6807\u8bb0\u6e05\u9664\uff0c\u4f4e\u505c\u987f\uff0c\u4f46\u6709\u788e\u7247\u95ee\u9898\u4e14\u5df2\u5728 JDK 14 \u4e2d\u88ab\u79fb\u9664<\/strong>\u3002\u4e86\u89e3\u5373\u53ef\uff0c\u4e0d\u8981\u5728\u65b0\u9879\u76ee\u91cc\u63d0\u3002<\/li>\n
          • G1<\/strong>\uff1aJDK 9 \u8d77\u7684\u9ed8\u8ba4\u56de\u6536\u5668<\/strong>\u3002\u628a\u5806\u5212\u5206\u6210\u591a\u4e2a Region\uff0c\u53ef\u9884\u6d4b\u7684\u505c\u987f\u65f6\u95f4\u6a21\u578b<\/strong>\uff08-XX:MaxGCPauseMillis<\/code>\uff0c\u9ed8\u8ba4 200ms\uff09\uff0c\u901a\u8fc7\u4f18\u5148\u56de\u6536\u6536\u76ca\u6700\u9ad8\u7684 Region\uff08Garbage First\uff09\u6765\u63a7\u5236\u505c\u987f\u3002\u9002\u5408\u5806 4GB\u2013\u6570\u5341 GB\u3001\u8981\u6c42\u5747\u8861\u5ef6\u8fdf\u4e0e\u541e\u5410\u7684\u670d\u52a1\u3002<\/li>\n
          • ZGC<\/strong>\uff1a\u8d85\u4f4e\u5ef6\u8fdf<\/strong>\uff0c\u505c\u987f\u65f6\u95f4\u57fa\u672c\u4e0e\u5806\u5927\u5c0f\u65e0\u5173\uff0c\u53ef\u7a33\u5b9a\u5728\u6beb\u79d2\u7ea7<\/strong>\uff0c\u652f\u6301 TB \u7ea7\u5806\u3002\u6838\u5fc3\u6280\u672f\u662f\u67d3\u8272\u6307\u9488\uff08Colored Pointers\uff09+ \u8bfb\u5c4f\u969c\uff08Load Barrier\uff09<\/strong>\uff0c\u5b9e\u73b0\u5e76\u53d1\u6574\u7406\u3002JDK 21 \u8d77\u652f\u6301\u5206\u4ee3\u3002<\/li>\n
          • Shenandoah<\/strong>\uff1a\u4e0e ZGC \u540c\u5c5e\u4f4e\u5ef6\u8fdf\u9635\u8425\uff0c\u6838\u5fc3\u6280\u672f\u662f Brooks \u8f6c\u53d1\u6307\u9488 + \u8bfb\u5c4f\u969c<\/strong>\uff0c\u5b9e\u73b0\u5e76\u53d1\u6574\u7406\u3002JDK 25 \u4e2d\u5206\u4ee3\u6a21\u5f0f\u8f6c\u6b63\uff08JEP 521\uff09<\/strong>\uff0c\u53ef\u7528 -XX:ShenandoahGCMode=generational<\/code> \u5f00\u542f\uff0c\u5728\u77ed\u751f\u547d\u5468\u671f\u5bf9\u8c61\u4e3a\u4e3b\u7684\u8d1f\u8f7d\u4e0a\u541e\u5410\u8868\u73b0\u66f4\u597d\u3002<\/li>\n<\/ul>\n
            \n

            \u9009\u578b\u5224\u65ad\u53e5\uff1a\u5806\u4e0d\u5927\u3001\u8ffd\u6c42\u541e\u5410 \u2192 Parallel\uff1b\u901a\u7528\u670d\u52a1\u7aef\u3001\u8981\u5e73\u8861 \u2192 G1\uff1b\u5ef6\u8fdf\u654f\u611f\u4e14\u5806\u5f88\u5927 \u2192 ZGC \u6216 Shenandoah\u3002<\/strong>\u522b\u4e00\u4e0a\u6765\u5c31\u8bf4”\u7528 ZGC”\uff0c\u5b83\u4e3a\u4e86\u4f4e\u5ef6\u8fdf\u4ed8\u51fa\u7684\u662f\u541e\u5410\u91cf\u4e0b\u964d\u548c\u989d\u5916\u7684\u5185\u5b58\u5f00\u9500\uff08\u8bfb\u5c4f\u969c\u6709\u6210\u672c\uff09\u3002<\/p>\n<\/blockquote>\n

            Q8\uff1aG1 \u4e3a\u4ec0\u4e48\u80fd\u8bbe\u505c\u987f\u76ee\u6807\uff1f<\/h3>\n

            \u56e0\u4e3a\u5b83\u4e0d\u518d\u8981\u6c42\u4e00\u6b21\u628a\u6574\u4e2a\u4ee3\u6e05\u7406\u5e72\u51c0<\/strong>\u3002G1 \u628a\u5806\u5206\u6210\u7ea6 2048 \u4e2a\u5927\u5c0f\u76f8\u7b49\u7684 Region\uff0c\u6bcf\u4e2a Region \u53ef\u4ee5\u5728\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3\u4e4b\u95f4\u52a8\u6001\u5207\u6362\u89d2\u8272\u3002\u56de\u6536\u65f6\uff1a<\/p>\n

              \n
            1. \u5e76\u53d1\u6807\u8bb0\u51fa\u5404\u4e2a Region \u7684\u5b58\u6d3b\u5bf9\u8c61\u6bd4\u4f8b\uff1b<\/li>\n
            2. \u6309”\u56de\u6536\u6536\u76ca \/ \u505c\u987f\u6210\u672c”\u6392\u5e8f\uff1b<\/li>\n
            3. \u5728\u505c\u987f\u76ee\u6807\u7684\u7ea6\u675f\u4e0b\uff0c\u9009\u62e9\u6536\u76ca\u6700\u9ad8\u7684\u4e00\u6279 Region \u4f5c\u4e3a\u56de\u6536\u96c6\uff08CSet\uff09<\/strong>\uff0c\u91c7\u7528\u590d\u5236\u7b97\u6cd5\u628a\u5b58\u6d3b\u5bf9\u8c61\u590d\u5236\u5230\u7a7a\u95f2 Region\uff1b<\/li>\n
            4. \u4e00\u6b21\u53ea\u56de\u6536\u4e00\u90e8\u5206\uff0c\u5269\u4e0b\u7684\u4e0b\u6b21\u518d\u6765\u3002<\/li>\n<\/ol>\n

              \u8fd9\u5c31\u662f”Garbage First”\u7684\u542b\u4e49\uff1a\u4f18\u5148\u56de\u6536\u5783\u573e\u6700\u591a\uff08\u6536\u76ca\u6700\u5927\uff09\u7684\u533a\u57df\uff0c\u4ece\u800c\u5728\u6709\u9650\u7684\u65f6\u95f4\u5185\u62ff\u5230\u6700\u5927\u7684\u7a7a\u95f4\u6536\u76ca\u3002<\/strong><\/p>\n

              Q9\uff1aZGC \u7684\u67d3\u8272\u6307\u9488\u662f\u4ec0\u4e48\uff1f<\/h3>\n

              \u4f20\u7edf\u65b9\u6848\u628a\u5bf9\u8c61\u72b6\u6001\uff08\u662f\u5426\u88ab\u79fb\u52a8\u3001\u662f\u5426\u5b58\u6d3b\uff09\u5b58\u5728\u5bf9\u8c61\u5934<\/strong>\u91cc\uff0cZGC \u628a\u5b83\u7f16\u7801\u8fdb64 \u4f4d\u6307\u9488\u7684\u9ad8\u4f4d\u7a7a\u95f2\u6bd4\u7279<\/strong>\u91cc\uff08\u6240\u4ee5\u53eb”\u67d3\u8272\u6307\u9488”\uff0c\u4e5f\u53eb Colored Pointer\uff09\u3002\u597d\u5904\u662f\uff1a<\/p>\n