{"id":933,"date":"2026-07-07T16:23:36","date_gmt":"2026-07-07T16:23:36","guid":{"rendered":"https:\/\/boochlin.com\/?p=933"},"modified":"2026-08-15T09:29:13","modified_gmt":"2026-08-15T09:29:13","slug":"android-%e7%88%9b%e8%a3%9d%e7%bd%ae%e6%83%b3%e8%b7%91%e4%ba%ba%e8%87%89%e8%be%a8%e8%ad%98-gc-thrashing-%e6%80%9d%e8%b7%af%e8%a3%9c%e5%85%85","status":"publish","type":"post","link":"https:\/\/boochlin.com\/?p=933","title":{"rendered":"Android \u721b\u88dd\u7f6e\u60f3\u8dd1\u4eba\u81c9\u8fa8\u8b58 – GC Thrashing \u601d\u8def\u88dc\u5145"},"content":{"rendered":"\n

\u5728\u6211\u5011\u90a3\u53f0\u53ea\u6709 2GB RAM\u3001CPU \u6548\u80fd\u5b71\u5f31\u7684\u5d4c\u5165\u5f0f\u9580\u7981\u6a5f\u4e0a\u8dd1\u4eba\u81c9\u8fa8\u8b58\uff0c\u958b\u767c\u8005\u7684\u65e5\u5e38\u57fa\u672c\u4e0a\u5c31\u662f\u8ddf\u7cfb\u7d71\u5728\u61f8\u5d16\u908a\u6436\u8a18\u61b6\u9ad4\u3002<\/p>\n\n\n\n

\u4e00\u5207\u7684\u958b\u7aef\uff0c\u6e90\u81ea\u65bc\u4e00\u6bb5\u8b93\u6211\u5011\u6bdb\u9aa8\u609a\u7136\u7684 Logcat\u3002<\/p>\n\n\n\n

\u67d0\u5929\uff0c\u6211\u5011\u767c\u73fe\u9580\u7981\u6a5f\u9023\u7e8c\u904b\u884c\u5e7e\u5c0f\u6642\u5f8c\uff0c\u756b\u9762\u958b\u59cb\u5287\u70c8\u6389\u5e40\u3001\u8fa8\u8b58\u5361\u6210\u5e7b\u71c8\u7247\u3002\u7cfb\u7d71\u6c92\u6709 OOM \u9583\u9000\uff0c\u4f46\u63a5\u4e0a adb \u6253\u958b logcat \u4e00\u770b\uff0c\u756b\u9762\u6b63\u5728\u4ee5\u6bcf\u79d2\u6578\u5341\u884c\u7684\u901f\u5ea6\u760b\u72c2\u6d17\u983b\uff1a<\/p>\n\n\n

\nI\/art: Background concurrent copying GC freed 50(2KB) AllocSpace objects, 0(0B) LOS objects, 11% free, 21MB\/23MB, paused 2.1ms total 25.1ms\nI\/art: Background concurrent copying GC freed 12(1KB) AllocSpace objects, 0(0B) LOS objects, 10% free, 21MB\/23MB, paused 1.8ms total 22.3ms\n<\/pre><\/div>\n\n\n
\u9019\u5728\u7cfb\u7d71\u5c64\u9762\u53eb\u505a GC Thrashing\uff08\u5783\u573e\u56de\u6536\u983b\u7e41\u985b\u7c38\uff09<\/strong>\u3002<\/p>\n\n\n\n
\u6ce8\u610f\u770b\u90a3\u500b freed<\/code> \u7684\u6578\u5b57\uff1aART \u7684\u5783\u573e\u56de\u6536\u5668\u6b63\u8655\u65bc\u6975\u5ea6\u6050\u614c\u7684\u72c0\u614b\uff0c\u5e7e\u5341\u6beb\u79d2\u5c31\u62da\u8001\u547d\u8dd1\u4e00\u6b21 GC\uff0c\u6bcf\u6b21\u537b\u53ea\u80fd\u6e05\u51fa\u5fae\u4e0d\u8db3\u9053\u7684 1~2 KB \u5783\u573e\u3002CPU \u7b97\u529b\u5168\u90e8\u88ab GC \u6436\u5149\uff0cAI \u6a21\u578b\u6839\u672c\u5206\u4e0d\u5230\u6642\u9593\u904b\u7b97\u3002<\/p>\n\n\n\n
\u6211\u5011\u7528 Memory Profiler \u6293\u4e0b Heap Dump\uff0c\u7a0b\u5f0f\u78bc\u660e\u660e\u6c92\u6709 Memory Leak\uff0c\u4f46\u537b\u770b\u5230\u5e7e\u5343\u500b OpenCV \u7684 Mat<\/code> \u548c ToF \u9ede\u96f2\u5305\u88dd\u7269\u4ef6\uff0c\u5168\u90e8\u5361\u5728\u4e00\u500b\u53eb java.lang.ref.FinalizerReference<\/code> \u7684\u968a\u5217\u88e1\u5927\u6392\u9577\u9f8d\u3002<\/p>\n\n\n\n
\u9019\u8b93\u6211\u5011\u7576\u5834\u50bb\u773c\uff1a\u300c\u7b49\u7b49\uff0c\u6211\u5011\u4e0d\u662f\u65e9\u5c31\u5347\u5230 Android 10 \u4e86\u55ce\uff1f\u5b98\u65b9\u4e0d\u662f\u65e9\u5c31\u5168\u9762\u6539\u7528 Cleaner \u4e86\u55ce\uff1f\u70ba\u4ec0\u9ebc Finalizer \u7684\u5e7d\u9748\u9084\u5728\uff1f\u300d<\/strong><\/p>\n\n\n\n
\n\n\n\n
<\/h2>\n\n\n\n
\u5f88\u591a\u958b\u767c\u8005\uff08\u5305\u62ec\u7576\u6642\u7684\u6211\u5011\uff09\u90fd\u6709\u4e00\u500b\u7f8e\u9e97\u7684\u8aa4\u89e3\uff1a\u4ee5\u70ba Android 8.0 \/ 10 \u628a Bitmap<\/code> \u6539\u7528 NativeAllocationRegistry` \u4e4b\u5f8c\uff0c`finalize()<\/code> \u9019\u500b\u6b77\u53f2\u5305\u88b1\u5c31\u5df2\u7d93\u5fb9\u5e95\u5f9e Android \u4e16\u754c\u4e0a\u6d88\u5931\u4e86\u3002<\/p>\n\n\n\n
\u73fe\u5be6\u7d66\u4e86\u6211\u5011\u4e00\u8a18\u91cd\u62f3\u3002<\/strong><\/p>\n\n\n\n
\u5728 Android 10\uff08API 29\uff09\u4e2d\uff0c\u771f\u76f8\u662f\u9019\u6a23\u7684\uff1a<\/p>\n\n\n\n
    \n
  • Google \u5b98\u65b9\u78ba\u5be6\u76e1\u529b\u4e86<\/strong>\uff1aAOSP \u5167\u5efa\u7684\u7cfb\u7d71\u985e\u5225\uff08\u4f8b\u5982 Bitmap<\/code>\u3001Paint<\/code>\u3001Canvas<\/code>\u3001Surface<\/code>\uff09\u78ba\u5be6 100% \u9077\u79fb\u5230\u4e86 NativeAllocationRegistry<\/code> \/ Cleaner<\/code>\uff0c\u4e0d\u518d\u4f7f\u7528 finalize()<\/code>\u3002<\/li>\n\n\n\n
  • \u4f46 ART \u865b\u64ec\u6a5f\u70ba\u4e86\u5411\u4e0b\u76f8\u5bb9\uff0c\u4f9d\u7136\u4fdd\u7559\u8457 Finalizer \u6a5f\u5236<\/strong>\uff1aFinalizerDaemon<\/code>\uff08\u55ae\u57f7\u884c\u7dd2\u8655\u7406\u968a\u5217\uff09\u8207 FinalizerWatchdogDaemon<\/code>\uff0810 \u79d2\u770b\u9580\u72d7\uff09\u4f9d\u7136\u5728\u80cc\u666f\u5e38\u99d0\u3002<\/li>\n\n\n\n
  • \u6700\u81f4\u547d\u7684\u523a\u5ba2\uff1a\u7b2c\u4e09\u65b9\u51fd\u5f0f\u5eab\u8207\u820a JNI \u5c01\u88dd<\/strong>\uff1a\u8a31\u591a\u7b2c\u4e09\u65b9 C++ \u5c01\u88dd\u5eab\uff08\u4f8b\u5982\u67d0\u4e9b\u7248\u672c\u7684 OpenCV org.opencv.core.Mat<\/code>\u3001\u820a\u7248\u76f8\u6a5f HAL \u5305\u88dd\u5c64\uff09\uff0c\u70ba\u4e86\u9632\u6b62\u958b\u767c\u8005\u5fd8\u8a18\u624b\u52d5\u91cb\u653e Native \u8a18\u61b6\u9ad4\uff0c\u5e95\u5c64\u4f9d\u7136\u5beb\u8457 protected void finalize()<\/code> \u4f86\u7576\u4f5c\u5b89\u5168\u7db2\u3002<\/li>\n<\/ul>\n\n\n\n
    \u5728\u4e00\u822c\u624b\u6a5f App \u4e0a\uff0c\u5076\u723e new \u5e7e\u500b Mat \u6839\u672c\u611f\u89ba\u4e0d\u51fa\u5dee\u5225\u3002<\/p>\n\n\n\n
    \u4f46\u5728\u6211\u5011\u9019\u53f0\u6bcf\u79d2\u541e\u5410 30 \u5e40\u9ad8\u983b\u5f71\u50cf\u7684\u9580\u7981\u6a5f\u4e0a\uff0c\u6bcf\u79d2\u7522\u751f\u5e7e\u767e\u500b\u5e36\u6709 finalize()<\/code> \u7684\u5f71\u50cf\u8207\u9ede\u96f2\u7269\u4ef6\u3002\u53ea\u8981 Class \u5ba3\u544a\u4e86 finalize()<\/code>\uff0cAndroid 10 \u7684 ART \u5728 new \u7269\u4ef6\u6642\uff0c\u5c31\u6703\u7121\u689d\u4ef6\u70ba\u5b83\u5efa\u7acb\u4e00\u500b FinalizerReference<\/code> \u585e\u9032\u968a\u5217\uff01<\/strong><\/p>\n\n\n\n
    \n\n\n\n
    \u4e0d\u662f\u6d29\u6f0f\uff0c\u662f\u56b4\u91cd\u585e\u8eca<\/h2>\n\n\n\n
    \u770b\u4e00\u773c\u6211\u5011\u4ee5\u524d\u81ea\u4ee5\u70ba\u8070\u660e\u7684\u820a\u4ee3\u78bc\uff0c\u4f60\u5c31\u77e5\u9053\u554f\u984c\u51fa\u5728\u54ea\uff1a<\/p>\n\n\n
    \n\/\/ \u4ee5\u524d\u81ea\u4ee5\u70ba\u7701\u4e8b\u7684\u5beb\u6cd5\uff1a\u628a\u91cb\u653e\u8cac\u4efb\u63a8\u7d66 GC\npublic class TofBufferWrapper {\n    private long nativePtr; \/\/ \u6307\u5411 C++ \u5e7e\u5341 MB \u7684 16-bit \u9ede\u96f2\n\n    public TofBufferWrapper(long ptr) {\n        this.nativePtr = ptr;\n    }\n\n    \/\/ \u6bd2\u7624\u6240\u5728\uff1a\u8a66\u5716\u9760 finalize() \u5e6b\u6211\u81ea\u52d5\u547c\u53eb C++ free\n    @Override\n    protected void finalize() throws Throwable {\n        try {\n            if (nativePtr != 0) {\n                nativeRelease(nativePtr); \/\/ JNI \u547c\u53eb C++ free\n            }\n        } finally {\n            super.finalize();\n        }\n    }\n}\n<\/pre><\/div>\n\n\n
    \u9019\u6bb5\u4ee3\u78bc\u5728\u4f4e\u968e\u786c\u9ad4\u4e0a\u5f15\u7206\u4e86\u9023\u74b0\u8eca\u798d\uff1a<\/p>\n\n\n\n
      \n
    • \u7368\u6728\u6a4b\u6548\u61c9<\/strong>\uff1a\u5168 App \u53ea\u6709\u552f\u4e00\u4e00\u689d\u57f7\u884c\u7dd2\uff08FinalizerDaemon<\/code>\uff09\u8ca0\u8cac\u57f7\u884c\u6240\u6709\u7269\u4ef6\u7684 finalize()<\/code>\u3002\u5728 1.4GHz \u7684\u7834 CPU \u4e0a\uff0c\u55ae\u4e00\u57f7\u884c\u7dd2\u6839\u672c\u6d88\u5316\u4e0d\u5b8c\u6bcf\u4e00\u5e40\u5e7e\u5341\u842c\u50cf\u7d20\u7684\u5716\u50cf\u6b98\u9ab8\u3002<\/li>\n\n\n\n
    • \u8a18\u61b6\u9ad4\u6bad\u5c4d\u5316<\/strong>\uff1a\u7576\u4e00\u500b\u7269\u4ef6\u88ab GC \u5224\u5b9a\u4e0d\u53ef\u9054\u6642\uff0c\u5b83\u4e0d\u6703\u7576\u5834\u88ab\u91cb\u653e<\/strong>\uff0c\u800c\u662f\u88ab\u9001\u9032 Finalizer \u968a\u5217\u6392\u968a\u7b49\u5f85\u3002\u9019\u610f\u5473\u8457\u5b83\u81f3\u5c11\u8981\u591a\u82df\u5ef6\u6b98\u5598\u4e00\u8f2a GC\u3002\u7a7a\u9593\u6e05\u4e0d\u51fa\u4f86\uff0cJava Heap \u88ab\u4f54\u6eff\uff0cGC \u5c31\u66f4\u983b\u7e41\u89f8\u767c\uff0c\u76f4\u63a5\u5f15\u7206 GC Thrashing\u3002<\/li>\n\n\n\n
    • \u96b1\u85cf\u7684 10 \u79d2\u6b7b\u5211<\/strong>\uff1aFinalizerWatchdogDaemon<\/code> \u53ea\u8981\u767c\u73fe\u67d0\u500b\u7269\u4ef6\u7684 finalize()<\/code> \u57f7\u884c\u8d85\u904e 10 \u79d2\uff08\u5728 CPU \u88ab AI \u8207 GC \u6436\u5149\u3001I\/O \u963b\u585e\u6642\u6975\u5bb9\u6613\u767c\u751f\uff09\uff0c\u770b\u9580\u72d7\u5c31\u6703\u76f4\u63a5\u5674\u51fa TimeoutException<\/code>\uff0c\u7121\u60c5\u5730\u628a App \u6574\u500b\u9032\u7a0b\u69cd\u6583\u3002<\/li>\n\n\n\n
    • GC \u76f2\u5340<\/strong>\uff1aJava \u7684 TofBufferWrapper<\/code> \u53ea\u6709\u5e7e\u5341 bytes\uff0cJava Heap \u89ba\u5f97\u5929\u4e0b\u592a\u5e73\uff1b\u4f46\u5e95\u5c64 C++ \u65e9\u5c31\u5806\u4e86\u5e7e\u767e MB \u7684\u9ede\u96f2\uff0c\u76f4\u63a5\u89f8\u767c LMKD \u6bba\u9032\u7a0b\u3002<\/li>\n<\/ul>\n\n\n\n
      \n","protected":false},"excerpt":{"rendered":"
      \u5728\u6211\u5011\u90a3\u53f0\u53ea\u6709 2GB RAM\u3001CPU \u6548\u80fd\u5b71\u5f31\u7684\u5d4c\u5165\u5f0f\u9580\u7981\u6a5f\u4e0a\u8dd1\u4eba\u81c9\u8fa8\u8b58\u6a21\u578b\uff0c\u958b\u767c\u8005\u7684\u65e5\u5e38\u5c31\u662f\u8ddf\u7cfb\u7d71\u6436\u8a18\u61b6\u9ad4\u3002<\/p>\n
      \u4e00\u5207\u7684\u958b\u7aef\uff0c\u6e90\u81ea\u65bc\u4e00\u6bb5\u8b93\u6211\u5011\u6bdb\u9aa8\u609a\u7136\u7684 Log\u3002<\/p>\n
      \u67d0\u5929\uff0c\u6211\u5011\u767c\u73fe AI \u8fa8\u8b58\u7cfb\u7d71\u5728\u9023\u7e8c\u904b\u884c\u5e7e\u5c0f\u6642\u5f8c\uff0c\u756b\u9762\u958b\u59cb\u56b4\u91cd\u6389\u5e40\u3001\u7cfb\u7d71\u6975\u5ea6\u5361\u9813\u3002\u6c92\u6709 OOM \u9583\u9000\uff0c\u4f46\u7576\u6211\u628a\u6a5f\u5668\u63a5\u4e0a adb \u6253\u958b logcat \u6642\uff0c\u756b\u9762\u6b63\u88ab\u9019\u7a2e\u65e5\u8a8c\u4ee5\u6bcf\u79d2\u6578\u5341\u884c\u7684\u901f\u5ea6\u760b\u72c2\u6d17\u983b\uff1a<\/p>\n","protected":false},"author":1,"featured_media":934,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[50,3,80],"tags":[],"_links":{"self":[{"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/posts\/933"}],"collection":[{"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=933"}],"version-history":[{"count":6,"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/posts\/933\/revisions"}],"predecessor-version":[{"id":982,"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/posts\/933\/revisions\/982"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/media\/934"}],"wp:attachment":[{"href":"https:\/\/boochlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=933"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=933"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=933"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}