{"id":67,"date":"2026-08-02T09:00:00","date_gmt":"2026-08-02T01:00:00","guid":{"rendered":"https:\/\/fsdata.site\/?p=67"},"modified":"2026-07-24T00:36:50","modified_gmt":"2026-07-23T16:36:50","slug":"%e8%b8%a9%e5%9d%91%e8%ae%b0%e5%bd%95%ef%bc%9a%e4%b8%80%e6%ac%a1%e7%94%9f%e4%ba%a7%e7%8e%af%e5%a2%83-oom-%e6%8e%92%e6%9f%a5%e5%85%a8%e6%b5%81%e7%a8%8b%e5%a4%8d%e7%9b%98","status":"publish","type":"post","link":"https:\/\/fsdata.site\/?p=67","title":{"rendered":"\u8e29\u5751\u8bb0\u5f55\uff1a\u4e00\u6b21\u751f\u4ea7\u73af\u5883 OOM \u6392\u67e5\u5168\u6d41\u7a0b\u590d\u76d8"},"content":{"rendered":"

\u4e00\u3001\u90a3\u4e2a\u534a\u591c\u7684\u62a5\u8b66<\/h2>\n

\u67d0\u65e5\u751f\u4ea7\u73af\u5883\u7a81\u7136\u5927\u9762\u79ef\u8d85\u65f6\uff0c\u76d1\u63a7\u663e\u793a JVM \u5806\u5185\u5b58 100%\uff0cFull GC \u6bcf\u79d2\u4e00\u6b21\uff0c\u670d\u52a1\u51e0\u4e4e\u505c\u6ede\u3002\u672c\u6587\u590d\u76d8\u5b8c\u6574\u6392\u67e5\u94fe\u8def\u3002<\/p>\n

\u4e8c\u3001\u7b2c\u4e00\u6b65\uff1a\u786e\u8ba4\u662f\u4e0d\u662f OOM<\/h2>\n
# \u770b\u8fdb\u7a0b\u5185\u5b58\ntop -p $(pgrep -f app.jar)\n# \u770b GC \u9891\u7387\njstat -gcutil $(pgrep -f app.jar) 1000\n<\/code><\/pre>\n
EU\/OU \u63a5\u8fd1 100% \u4e14 FGCT \u6301\u7eed\u589e\u957f\uff0c\u57fa\u672c\u9501\u5b9a\u5806\u5185\u5b58\u95ee\u9898\u3002<\/p>\n
\u4e09\u3001\u7b2c\u4e8c\u6b65\uff1a\u6293\u5806\u8f6c\u50a8<\/h2>\n
# \u81ea\u52a8\u5728 OOM \u65f6 dump\uff08\u63a8\u8350\u63d0\u524d\u52a0\uff09\n-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=\/tmp\/heap.hprof\n# \u6216\u624b\u52a8\u6293\njmap -dump:live,format=b,file=\/tmp\/heap.hprof $(pgrep -f app.jar)\n<\/code><\/pre>\n
\u56db\u3001\u7b2c\u4e09\u6b65\uff1a\u7528 MAT \u5206\u6790<\/h2>\n
\u6253\u5f00 Eclipse MAT\uff0c\u770b Dominator Tree<\/em>\uff0c\u8c01\u5360\u7684\u5185\u5b58\u6700\u591a\u4e00\u76ee\u4e86\u7136\u3002\u672c\u6b21\u53d1\u73b0 ConcurrentHashMap<\/code> \u91cc\u585e\u4e86\u51e0\u767e\u4e07\u6761\u7f13\u5b58\u5bf9\u8c61\uff0c\u4e14\u4ece\u4e0d\u8fc7\u671f\u3002<\/p>\n
\u4e94\u3001\u6839\u56e0\uff1a\u7f13\u5b58\u6ca1\u8bbe\u4e0a\u9650<\/h2>\n
\u4ee3\u7801\u91cc\u7528\u666e\u901a HashMap \u505a\u672c\u5730\u7f13\u5b58\uff0ckey \u968f\u65f6\u95f4\u65e0\u9650\u589e\u957f\u3002\u4fee\u590d\uff1a<\/p>\n
\/\/ \u6539\u7528 Caffeine\uff0c\u5e26\u5bb9\u91cf\u548c\u8fc7\u671f\nCache<String, Data> cache = Caffeine.newBuilder()\n    .maximumSize(10_000)\n    .expireAfterWrite(10, TimeUnit.MINUTES)\n    .build();\n<\/code><\/pre>\n
\u516d\u3001\u590d\u76d8\u6e05\u5355<\/h2>\n
    \n
  • \u672c\u5730\u7f13\u5b58\u5fc5\u987b\u8bbe\u5bb9\u91cf\u4e0a\u9650\u548c\u8fc7\u671f\u7b56\u7565\u3002<\/li>\n
  • \u5bb9\u5668\u5185\u5b58\u9650\u5236\u8981\u5408\u7406\uff0c\u907f\u514d\u88ab OS OOM Killer \u8bef\u6740\u3002<\/li>\n
  • \u63d0\u524d\u5f00 HeapDumpOnOutOfMemoryError<\/code>\uff0c\u51fa\u4e8b\u80fd\u79d2\u5b9a\u4f4d\u3002<\/li>\n
  • \u52a0\u76d1\u63a7\uff1a\u5806\u4f7f\u7528\u7387\u8d85 80% \u5c31\u544a\u8b66\uff0c\u522b\u7b49\u6545\u969c\u3002<\/li>\n<\/ul>\n
    \u7ed3\u8bed<\/h2>\n
    \u6bcf\u6b21 OOM \u90fd\u662f\u4e00\u6b21\u514d\u8d39\u7684\u6559\u5b66\u3002\u628a\u6392\u67e5\u8fc7\u7a0b\u8bb0\u4e0b\u6765\uff0c\u4e0b\u6b21\u540c\u7c7b\u95ee\u9898\u5341\u5206\u949f\u89e3\u51b3\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u771f\u5b9e\u590d\u76d8\u4e00\u6b21\u751f\u4ea7 OOM\uff1a\u5982\u4f55\u786e\u8ba4\u3001\u6293\u5806\u8f6c\u50a8\u3001\u7528 MAT \u5b9a\u4f4d\u5230\u65e0\u4e0a\u9650\u672c\u5730\u7f13\u5b58\uff0c\u4ee5\u53ca\u590d\u76d8\u6e05\u5355\u3002<\/p>\n","protected":false},"author":2,"featured_media":160,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-67","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pitfalls"],"_links":{"self":[{"href":"https:\/\/fsdata.site\/index.php?rest_route=\/wp\/v2\/posts\/67","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fsdata.site\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fsdata.site\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fsdata.site\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/fsdata.site\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=67"}],"version-history":[{"count":1,"href":"https:\/\/fsdata.site\/index.php?rest_route=\/wp\/v2\/posts\/67\/revisions"}],"predecessor-version":[{"id":167,"href":"https:\/\/fsdata.site\/index.php?rest_route=\/wp\/v2\/posts\/67\/revisions\/167"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/fsdata.site\/index.php?rest_route=\/wp\/v2\/media\/160"}],"wp:attachment":[{"href":"https:\/\/fsdata.site\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=67"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fsdata.site\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=67"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fsdata.site\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=67"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}