{"id":161337,"date":"2024-05-08T13:49:24","date_gmt":"2024-05-08T05:49:24","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/161337.html"},"modified":"2024-05-08T13:49:29","modified_gmt":"2024-05-08T05:49:29","slug":"%e7%81%ab%e7%8b%90%e7%9a%84javascript%e5%bc%95%e6%93%8e%e6%9c%89gc%e6%b2%a1%e6%9c%89","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/161337.html","title":{"rendered":"\u706b\u72d0\u7684Javascript\u5f15\u64ce\u6709GC\u6ca1\u6709"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/26223912\/6924dfff-25b7-4873-84c1-16064b16fbd5.webp\" alt=\"\u706b\u72d0\u7684Javascript\u5f15\u64ce\u6709GC\u6ca1\u6709\" \/><\/p>\n<p><p>\u662f\u7684\uff0c<strong>\u706b\u72d0\u7684JavaScript\u5f15\u64ce\u5305\u542b\u5783\u573e\u56de\u6536\u673a\u5236\uff08GC\uff09<\/strong> 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Eich\u57281995\u5e74\u521b\u5efa\u3002\u5783\u573e\u56de\u6536\u673a\u5236\u662f\u5176\u6838\u5fc3\u7684\u90e8\u5206\uff0c\u8d1f\u8d23\u7ba1\u7406JavaScript\u4ee3\u7801\u5728\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u5360\u7528\u7684\u5185\u5b58\u3002<\/p>\n<\/p>\n<p><p>\u5783\u573e\u56de\u6536\u8fc7\u7a0b\u5927\u81f4\u5206\u4e3a\u51e0\u4e2a\u9636\u6bb5\uff1a\u6807\u8bb0\uff08Mark\uff09\u2014\u2014\u6807\u8bb0\u51fa\u6240\u6709\u4ece\u6839\u8282\u70b9\u5f00\u59cb\u53ef\u5230\u8fbe\u7684\u5bf9\u8c61\uff1b\u6e05\u9664\uff08Sweep\uff09\u2014\u2014\u6e05\u9664\u90a3\u4e9b\u5728\u6807\u8bb0\u9636\u6bb5\u672a\u88ab\u6807\u8bb0\u7684\u5bf9\u8c61\uff1b\u5185\u5b58\u6574\u7406\uff08Compaction\uff09\u2014\u2014\u5728\u5fc5\u8981\u65f6\u6574\u7406\u5185\u5b58\u788e\u7247\uff0c\u63d0\u9ad8\u5185\u5b58\u4f7f\u7528\u6548\u7387\u3002\u5728\u5783\u573e\u56de\u6536\u7684\u5b9e\u65bd\u8fc7\u7a0b\u4e2d\uff0cSpiderMonkey\u5229\u7528\u4e86\u591a\u79cd\u4f18\u5316\u7b56\u7565\uff0c\u6bd4\u5982\u589e\u91cf\u6536\u96c6\u3001\u5206\u4ee3\u6536\u96c6\u7b49\uff0c\u4ee5\u5c3d\u91cf\u51cf\u5c11\u5783\u573e\u56de\u6536\u5bf9\u7a0b\u5e8f\u6267\u884c\u7684\u5e72\u6270\u3002<\/p>\n<\/p>\n<p><p>\u4e00\u3001GARBAGE COLLECTION IN SPIDERMONKEY<\/p>\n<\/p>\n<p><p>\u5783\u573e\u56de\u6536\u5bf9\u4e8e\u4efb\u4f55\u73b0\u4ee3JavaScript\u5f15\u64ce\u90fd\u81f3\u5173\u91cd\u8981\u3002\u5728\u706b\u72d0\u7684SpiderMonkey\u5f15\u64ce\u4e2d\uff0cGC\u4e0d\u4ec5\u4ec5\u662f\u7b80\u5355\u5730\u56de\u6536\u65e0\u7528\u5185\u5b58\u3002\u5b83\u4f7f\u7528\u4e86\u590d\u6742\u548c\u9ad8\u7ea7\u7684\u6280\u672f\u6765\u63d0\u9ad8\u6027\u80fd\u3001\u51cf\u5c11\u5ef6\u8fdf\uff0c\u5e76\u5c3d\u91cf\u51cf\u5c0f\u5bf9\u7528\u6237\u4f53\u9a8c\u7684\u5f71\u54cd\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u5783\u573e\u56de\u6536\u7684\u57fa\u672c\u539f\u7406<\/h3>\n<\/p>\n<p><p>\u5728\u8ba8\u8bbaSpiderMonkey\u6240\u4f7f\u7528\u7684\u5177\u4f53\u5783\u573e\u56de\u6536\u6280\u672f\u4e4b\u524d\uff0c\u9996\u5148\u4e86\u89e3\u5b83\u57fa\u4e8e\u7684\u57fa\u672c\u539f\u7406\u662f\u6709\u5e2e\u52a9\u7684\u3002\u5783\u573e\u56de\u6536\u4e3b\u8981\u901a\u8fc7\u8ffd\u8e2a\u5e94\u7528\u7a0b\u5e8f\u8fd0\u884c\u65f6\u5206\u914d\u7684\u6240\u6709\u5185\u5b58\u5757\u6765\u5de5\u4f5c\u3002\u5f53\u8fd9\u4e9b\u5185\u5b58\u5757\u4e0d\u518d\u88ab\u5e94\u7528\u9700\u8981\u65f6\uff0c\u5373\u89c6\u4e3a\u201c\u5783\u573e\u201d\uff0cGC\u4f1a\u56de\u6536\u8fd9\u4e9b\u5185\u5b58\u4f9b\u65b0\u7684\u4f7f\u7528\u3002<\/p>\n<\/p>\n<p><p>JavaScript\u4f5c\u4e3a\u4e00\u95e8\u9ad8\u7ea7\u8bed\u8a00\uff0c\u62bd\u8c61\u4e86\u5185\u5b58\u7ba1\u7406\u7684\u590d\u6742\u6027\uff0c\u5f00\u53d1\u4eba\u5458\u4e0d\u9700\u8981\u663e\u5f0f\u5730\u5206\u914d\u548c\u91ca\u653e\u5185\u5b58\uff0c\u8fd9\u5c31\u5168\u7136\u4f9d\u8d56\u4e8e\u5f15\u64ce\u7684\u5783\u573e\u56de\u6536\u673a\u5236\u6765\u4fdd\u8bc1\u5185\u5b58\u7684\u6b63\u786e\u4f7f\u7528\u3002SpiderMonkey\u5f15\u64ce\u4f1a\u5b9a\u671f\u6267\u884c\u5783\u573e\u56de\u6536\uff0c\u4ee5\u4fdd\u8bc1\u4e0d\u4f1a\u51fa\u73b0\u5185\u5b58\u6ea2\u51fa\u7684\u60c5\u51b5\uff0c\u540c\u65f6\u4e5f\u8bd5\u56fe\u5c06\u56de\u6536\u64cd\u4f5c\u7684\u6027\u80fd\u5f71\u54cd\u964d\u5230\u6700\u4f4e\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u5783\u573e\u56de\u6536\u7684\u4f18\u5316\u6280\u672f<\/h3>\n<\/p>\n<p><p><strong>SpiderMonkey\u5b9e\u65bd\u4e86\u591a\u79cd\u4f18\u5316\u7684\u5783\u573e\u56de\u6536\u6280\u672f<\/strong>\uff0c\u6bd4\u5982<strong>\u589e\u91cf\u5783\u573e\u56de\u6536\uff08Incremental GC\uff09<\/strong>\u3002\u4f20\u7edf\u7684\u5783\u573e\u56de\u6536\u53ef\u80fd\u4f1a\u505c\u6b62\u7a0b\u5e8f\u7684\u8fd0\u884c\uff0c\u800c\u589e\u91cf\u6536\u96c6\u91c7\u53d6\u5c06\u5783\u573e\u56de\u6536\u5206\u6210\u8bb8\u591a\u5c0f\u5757\u7684\u64cd\u4f5c\uff0c\u5728JavaScript\u4ee3\u7801\u7684\u6267\u884c\u95f4\u9699\u8fdb\u884c\uff0c\u5927\u5e45\u51cf\u5c11\u4e86\u6bcf\u6b21\u6536\u96c6\u5f15\u8d77\u7684\u505c\u987f\u65f6\u95f4\u3002<\/p>\n<\/p>\n<p><p>\u53e6\u4e00\u79cd\u6280\u672f\u662f<strong>\u5206\u4ee3\u6536\u96c6\uff08Generational GC\uff09<\/strong>\u3002\u8fd9\u79cd\u7b56\u7565\u57fa\u4e8e\u8fd9\u6837\u4e00\u4e2a\u89c2\u5bdf\uff1a\u8bb8\u591a\u5bf9\u8c61\u5728\u5185\u5b58\u4e2d\u5b58\u6d3b\u7684\u65f6\u95f4\u8f83\u77ed\u3002\u56e0\u6b64\uff0cSpiderMonkey\u4e2d\u7684\u5bf9\u8c61\u88ab\u5206\u4e3a\u4e0d\u540c\u7684\u201c\u4ee3\u201d\uff0c\u901a\u5e38\u6709\u201c\u65b0\u751f\u4ee3\u201d\u548c\u201c\u8001\u751f\u4ee3\u201d\u3002\u65b0\u521b\u5efa\u7684\u5bf9\u8c61\u9996\u5148\u88ab\u5206\u914d\u5230\u65b0\u751f\u4ee3\uff0c\u5b83\u6709\u8f83\u5c0f\u7684\u7a7a\u95f4\u4f46\u5783\u573e\u6536\u96c6\u9891\u7387\u8f83\u9ad8\u3002\u800c\u4e00\u4e9b\u7ecf\u8fc7\u591a\u6b21\u6536\u96c6\u540e\u4f9d\u7136\u5b58\u6d3b\u7684\u5bf9\u8c61\uff0c\u5219\u88ab\u79fb\u5230\u8001\u751f\u4ee3\uff0c\u5728\u90a3\u91cc\u4ed6\u4eec\u5c06\u4e0d\u90a3\u4e48\u9891\u7e41\u5730\u88ab\u68c0\u67e5\u3002<\/p>\n<\/p>\n<p><p><strong>\u53ef\u8bbf\u95ee\u6027\u5206\u6790\uff08Reachability Analysis\uff09<\/strong> \u4e5f\u662f\u4e00\u4e2a\u6838\u5fc3\u6280\u672f\u3002\u5783\u573e\u56de\u6536\u5668\u4f1a\u5b9a\u671f\u4ece\u201c\u6839\u201d\uff08\u901a\u5e38\u662f\u5168\u5c40\u53d8\u91cf\u548c\u6d3b\u52a8\u7684\u8c03\u7528\u6808\uff09\u5f00\u59cb\uff0c\u6807\u8bb0\u6240\u6709\u53ef\u4ee5\u8bbf\u95ee\u5230\u7684\u5bf9\u8c61\u3002\u5728\u6807\u8bb0\u8fc7\u7a0b\u7ed3\u675f\u540e\uff0c\u672a\u88ab\u6807\u8bb0\u7684\u5bf9\u8c61\u5c31\u4f1a\u88ab\u8ba4\u5b9a\u4e3a\u4e0d\u80fd\u88ab\u8bbf\u95ee\uff0c\u5373\u662f\u201c\u5783\u573e\u201d\uff0c\u5e76\u5c06\u5728\u968f\u540e\u7684\u6e05\u9664\u9636\u6bb5\u88ab\u56de\u6536\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u5783\u573e\u56de\u6536\u5bf9\u6027\u80fd\u7684\u5f71\u54cd<\/h3>\n<\/p>\n<p><p>\u867d\u7136\u5783\u573e\u56de\u6536\u673a\u5236\u4f7f\u5f97\u5f00\u53d1\u4eba\u5458\u4e0d\u9700\u8981\u624b\u52a8\u7ba1\u7406\u5185\u5b58\uff0c\u4f46\u5b83\u4e5f\u4f1a\u5e26\u6765\u6027\u80fd\u8d1f\u62c5\u3002\u6bcf\u6b21\u5783\u573e\u56de\u6536\u90fd\u9700\u8981\u6682\u505c\u7a0b\u5e8f\u7684\u6267\u884c\u6765\u8fdb\u884c\u5185\u5b58\u5206\u6790\u548c\u56de\u6536\uff0c\u8fd9\u6837\u7684\u6682\u505c\u79f0\u4e3a\u201c\u505c\u987f\u65f6\u95f4\u201d\uff08Pause Time\uff09\u3002\u4e3a\u4e86\u6700\u5c0f\u5316\u505c\u987f\u65f6\u95f4\uff0c<strong>SpiderMonkey\u5b9e\u65bd\u4e86\u5e76\u884c\u5783\u573e\u56de\u6536\uff08Parallel GC\uff09\u548c\u5ef6\u8fdf\u6e05\u9664\uff08Incremental Sweeping\uff09<\/strong> 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