{"id":325890,"date":"2021-02-02T21:58:09","date_gmt":"2021-02-02T13:58:09","guid":{"rendered":"http:\/\/4563.org\/?p=325890"},"modified":"2021-02-02T21:58:09","modified_gmt":"2021-02-02T13:58:09","slug":"java-%e7%9a%84%e7%ba%bf%e7%a8%8b%e5%88%b0%e5%ba%95%e5%8d%a0%e7%94%a8%e4%ba%86%e5%a4%9a%e5%b0%91%e5%86%85%e5%ad%98","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=325890","title":{"rendered":"Java \u7684\u7ebf\u7a0b\u5230\u5e95\u5360\u7528\u4e86\u591a\u5c11\u5185\u5b58?"},"content":{"rendered":"
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Java \u7684\u7ebf\u7a0b\u5230\u5e95\u5360\u7528\u4e86\u591a\u5c11\u5185\u5b58? <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : manecocomph <\/span> <\/i> 4<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u539f\u6587\u94fe\u63a5: https:\/\/mp.weixin.qq.com\/s\/wA3pUemz5oWJX6Zp9HFIGA<\/p>\n

\u539f\u6587\u6392\u7248\u6bd4\u8f83\u597d\u4e00\u70b9, \u6b22\u8fce\u8ba8\u8bba. <\/p>\n

\u82e5\u662f\u6709\u4eba\u95ee\u4f60\u6b63\u5728\u8fd0\u884c\u7684 Java \u7a0b\u5e8f\u7684\u5806\u5360\u7528\u4e86\u591a\u5c11\u5185\u5b58, \u4f60\u4e00\u4e2a\u547d\u4ee4\u5c31\u7ed9\u51fa\u4e86\u7b54\u6848; \u82e5\u662f\u6709\u4eba\u95ee\u4f60\u6b63\u5728\u8fd0\u884c\u7684 Java \u7a0b\u5e8f\u7684\u7ebf\u7a0b\u6808\u4f7f\u7528\u4e86\u591a\u5c11\u5185\u5b58, \u8be5\u600e\u4e48\u5f97\u5230\u7b54\u6848\u5462? <\/p>\n

\u6545\u4e8b\u80cc\u666f<\/h3>\n

\u6709\u4eba\u7684 Java \u7a0b\u5e8f\u9047\u5230\u4e86 OOM, \u7a0b\u5e8f\u5d29\u6e83\u4e4b\u524d, \u53ea\u7ed9\u51fa\u4e86\u8fd9\u4e48\u4e00\u53e5\u5173\u952e\u9057\u8a00: “java.lang.OutOfMemoryError: unable to create new native thread”. \u4ece\u8fd9\u4e00\u53e5\u5173\u952e\u7684\u9057\u8a00\u4e2d, \u6211\u4eec\u5e76\u4e0d\u80fd\u5b8c\u5168\u63a8\u5bfc\u51fa\u5b83\u5d29\u6e83\u4e4b\u524d\u5230\u5e95\u53d1\u751f\u4e86\u4ec0\u4e48\u4e8b\u60c5. Google \u7ed9\u51fa\u7684\u7b54\u6848\u91cc, \u6709\u7684\u8bf4\u662f\u9047\u5230\u7684\u64cd\u4f5c\u7cfb\u7edf\u7684 limits \u9650\u5236, \u6709\u7684\u8bf4\u5185\u5b58\u771f\u7684\u88ab\u7528\u5149\u4e86.<\/p>\n

\u672c\u6587\u5e76\u4e0d\u60f3\u53bb\u63a2\u8ba8\u8fd9\u4e2a OOM \u7684\u5177\u4f53\u539f\u56e0, \u800c\u662f\u53bb\u8ffd\u95ee\u5176\u4e2d\u7684\u4e00\u4e2a\u5206\u652f\u95ee\u9898: Java \u7684\u7ebf\u7a0b\u5230\u5e95\u5360\u7528\u4e86\u591a\u5c11\u7269\u7406\u5185\u5b58? <\/p>\n

\u6709\u5173 Xss \u548c ThreadStackSize<\/h3>\n

\u9996\u5148, \u6839\u636e\u7528\u9014, Java \u7684\u5185\u5b58\u4f7f\u7528\u53ef\u4ee5\u5206\u4e3a: \u5806\u533a (\u5e74\u8f7b\u4ee3, \u8001\u5e74\u4ee3, \u5143\u6570\u636e\u533a) , \u6808\u533a, \u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u533a, \u7f16\u8bd1\u5668\u4ee3\u7801\u533a, GC \u7ba1\u7406\u7a0b\u5e8f\u533a, JVM \u81ea\u8eab\u7684\u4ee3\u7801\u533a \u548c \u7b26\u53f7\u533a\u7b49. \u4e00\u822c\u60c5\u51b5\u4e0b, \u5360\u5927\u5934\u7684\u662f\u5806\u533a. \u6808\u533a\u6839\u636e\u7ebf\u7a0b\u6570\u53ef\u80fd\u5927\u5c0f\u4e0d\u4e00. <\/p>\n

\u5728 JVM \u7684 flags \u91cc\u9762, \u6709 2 \u4e2a\u53c2\u6570\u662f\u4e0e\u6808\u5927\u5c0f\u76f8\u5173\u7684. \u5206\u522b\u662f -Xss \u548c -XX:ThreadStackSize. \u6211\u4eec\u53ef\u4ee5\u8ba4\u4e3a 2 \u4e2a flags \u5176\u5b9e\u4ee3\u8868\u4e00\u4e2a\u610f\u601d, \u53ea\u662f\u4e00\u4e2a\u662f\u7b80\u5199, \u4e00\u4e2a\u662f\u5168\u91cf\u5199\u6cd5. \u6839\u636e\u5b98\u65b9\u6587\u6863, \u5b83\u8bbe\u7f6e\u7684\u662f\u4e00\u4e2a\u7ebf\u7a0b Stack \u7684\u5927\u5c0f. \u82e5\u662f\u4e0d\u8bbe\u7f6e, \u6839\u636e\u64cd\u4f5c\u7cfb\u7edf\u7684\u4e0d\u540c, \u6709\u4e0d\u540c\u7684\u9ed8\u8ba4\u503c. \u5982 64 \u4f4d\u7684 Linux \u4e0b, \u9ed8\u8ba4\u662f 1MB. <\/p>\n

\u7ebf\u7a0b\u6808\u7684\u5927\u5c0f<\/h3>\n

\u662f\u4e0d\u662f\u6839\u636e Xss \u7684\u503c\u4e58\u4ee5\u7ebf\u7a0b\u6570, \u5c31\u5f97\u5230\u4e86\u6240\u6709\u7ebf\u7a0b\u6808\u5360\u7528\u7684\u7269\u7406\u5185\u5b58\u5927\u5c0f\u5462? \u4e8e\u662f, \u6211\u627e\u5230\u4e00\u4e2a\u57fa\u4e8e JDK 8, \u6b63\u5728\u8fd0\u884c, \u5e76\u4e14\u7ebf\u7a0b\u6570\u76ee\u5de8\u5927(\u5176\u5b9e\u662f\u6709\u7ebf\u7a0b\u6cc4\u6f0f\u7684 bug)\u7684\u7a0b\u5e8f. \u4f7f\u7528 NMT \u5f97\u5230\u4e86\u4e0b\u9762\u7684\u7ed3\u679c:<\/p>\n

\"Java <\/p>\n

\u8fd9\u4ee3\u8868\u4ec0\u4e48\u5462? \u5f53\u65f6\u7684\u6d3b\u8dc3\u7ebf\u7a0b\u6570\u5927\u6982\u662f 13991 \u4e2a, \u6808\u6240\u58f0\u660e\u8981\u4f7f\u7528\u7684\u5185\u5b58\u6570 14454495KB, \u5b9e\u9645\u63d0\u4ea4 (committed) \u7684 \u5185\u5b58\u7ea6 13.71G. \u8fd9\u662f\u4e00\u4e2a\u58f0\u660e\u4e86\u4f7f\u7528 8 \u6838 16G \u5185\u5b58\u7684 container \u8fdb\u7a0b, \u800c\u8fd9\u4e2a Java \u8fdb\u7a0b\u7684\u6808\u5374\u544a\u8bc9\u6211\u4eec: \u6808\u4f7f\u7528\u4e86 13.71G \u5185\u5b58, \u52a0\u4e0a\u5806\u5360\u7528\u7684 8 \u4e2a\u591a G, \u8be5\u8fdb\u7a0b\u5df2\u7ecf\u63d0\u4ea4\u4e86 24G \u591a\u7684\u5185\u5b58\u5360\u7528 (\u6ca1\u5f00 SWAP). \u8fd9\u660e\u663e\u5df2\u7ecf\u77db\u76fe. <\/p>\n

\u540c\u65f6, \u6211\u4eec\u901a\u8fc7 ps \u547d\u4ee4\u53ef\u4ee5\u770b\u5230, \u8be5\u8fdb\u7a0b\u5360\u7528\u5927\u7ea6 13G \u7684 RSS \u5185\u5b58. Container \u8bbe\u7f6e\u7684\u5185\u5b58\u6700\u5927\u503c\u662f 16G, \u5f53\u524d\u8fd8\u6709 500M \u7684\u7a7a\u4f59. (\u8be5 Container \u662f\u4e00\u4e2a fat Container, \u91cc\u9762\u8fd8\u6709\u5176\u5b83\u8f85\u52a9\u8fdb\u7a0b). \u8fd9\u662f\u4e00\u4e2a\u5408\u7406\u7684\u60c5\u5f62. <\/p>\n

\"Java <\/p>\n

\u6570\u636e\u5bf9\u4e0d\u4e0a, \u81f3\u5c11\u6709\u4e00\u4e2a\u4eba\u5728\u8bf4\u8c0e. <\/p>\n

NMT \u7684 bug<\/h3>\n

NMT \u4f5c\u4e3a JVM \u63d0\u4f9b\u7684\u4e00\u4e2a\u8ffd\u8e2a\u539f\u751f\u5185\u5b58\u4f7f\u7528\u91cf\u7684\u5de5\u5177, \u6700\u65e9\u4e3b\u8981\u7528\u6765\u8ffd\u67e5\u5185\u5b58\u6cc4\u6f0f\u7684. \u4e3b\u8981\u7684\u5185\u5b58\u6cc4\u6f0f\u5927\u90fd\u96c6\u4e2d\u5728\u5806\u533a. \u5bf9\u4e8e\u6808\u533a, \u65e9\u671f\u7684 NMT \u7684\u8ba1\u7b97\u65b9\u5f0f\u4e3b\u8981\u4ee5\u7ebf\u7a0b\u6570\u4e58\u4ee5\u6bcf\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u4f7f\u7528\u7684\u6700\u5927\u5185\u5b58\u91cf( Xss)\u5f97\u5230\u7684. \u6240\u4ee5, \u76f4\u5230 2018 \u5e74, \u6709\u4eba\u62a5\u4e86\u8fd9\u4e2a\u95ee\u9898, \u624d\u6709\u4e86\u8fd9\u4e2a\u4fee\u590d: https:\/\/bugs.openjdk.java.net\/browse\/JDK-8191369. <\/p>\n

\u4f46\u662f\u8fd9\u4e2a\u4fee\u590d\u4e3b\u8981\u4fee\u4e86 Linux \u548c Windows \u7248\u672c. \u6240\u4ee5\u5373\u4fbf\u6211\u5728 MAC \u4e0a\u4e0b\u8f7d\u4e86 JDK 15 \u7684 release \u7248\u672c, \u4f9d\u65e7\u6709\u8fd9\u4e2a\u6570\u636e\u95ee\u9898. <\/p>\n

\u4fee\u590d\u540e\u7684\u7ed3\u679c<\/h3>\n

\u6211\u627e\u4e86\u4e00\u4e2a Linux \u4e0a\u57fa\u4e8e JDK 11 \u7684\u7a0b\u5e8f, \u4f7f\u7528 NMT \u4e4b\u540e, \u7ec8\u4e8e\u770b\u5230\u4e86\u60f3\u8981\u7684\u7ed3\u679c: <\/p>\n

\"Java <\/p>\n

\u8fd9\u91cc\u5927\u7ea6\u6709 310 \u4e2a\u8fd0\u884c\u4e2d\u7ebf\u7a0b, \u4f7f\u7528\u4e86\u5927\u6982 38M, \u5e73\u5747\u4f7f\u7528 100K \u591a\u4e00\u4e9b. \u8fd9\u624d\u662f\u771f\u6b63\u7684\u7ed3\u679c. <\/p>\n

\u4e3a\u4ec0\u4e48\u4fdd\u7559 1M, \u5374\u53ea\u4f7f\u7528\u4e86 100K?<\/h3>\n

\u8fd9\u5176\u5b9e\u5c31\u662f\u865a\u62df\u5185\u5b58\u548c\u771f\u5b9e\u7269\u7406\u5185\u5b58\u5dee\u5f02\u7684\u539f\u56e0. \u82e5 Xss \u8981\u6c42\u662f 1M, \u90a3\u4e48\u6bcf\u4e2a\u7ebf\u7a0b\u4f1a\u7533\u8bf7 1M \u7684\u865a\u62df\u5185\u5b58, \u53ef\u662f\u5927\u90e8\u5206\u7ebf\u7a0b\u5e76\u4e0d\u4f1a\u4f7f\u7528\u8fd9\u4e48\u591a, \u4e5f\u5c31\u6ca1\u5fc5\u8981\u5360\u7528\u8fd9\u4e48\u591a\u7269\u7406\u5185\u5b58, \u4f7f\u7528\u591a\u5c11\u4e2a\u9875(\u533f\u540d page), \u5c31\u63d0\u4ea4\u591a\u5c11\u4e2a\u9875. \u82e5\u6309\u7167\u6bcf\u9875 4K \u8ba1\u7b97, \u4e5f\u5c31\u662f\u5e73\u5747 25 \u4e2a\u9875\u5de6\u53f3, \u5c31\u6ee1\u8db3\u4e86\u5927\u90e8\u5206\u7ebf\u7a0b\u7684\u5185\u5b58\u9700\u6c42. <\/p>\n

\u53e6\u5916, \u5982\u679c\u6211\u4eec\u67e5\u770b IBM JDK \u6216 Eclipse OpenJ9 \u7684\u6587\u6863, \u6211\u4eec\u53ef\u80fd\u770b\u5230\u53e6\u5916 2 \u4e2a\u542f\u52a8\u7684 flags, \u5206\u522b\u662f: -Xiss \u548c -Xssi. \u5206\u522b\u4ee3\u8868\u6808\u7684 Initial Stack Size (\u521d\u59cb\u503c) \u548c Stack Size Increment (\u6e10\u589e\u503c). \u6240\u4ee5\u6211\u4eec\u4e4b\u524d\u8ba8\u8bba\u7684 Xss \u4ee3\u8868\u6700\u5927\u503c.<\/p>\n<\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (4<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : guo4224 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4f60\u8fd9\u662f\u4ec0\u4e48\u725b\u903c os <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : manecocomph <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @guo4224 \u4e00\u822c\u7684 Linux. \u6ca1\u770b\u51fa\u6765\u54ea\u91cc\u725b\u903c… <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : liuhuan475 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6bcf\u4e2a\u7ebf\u7a0b\u6709\u9884\u7559\u7684\u5185\u5b58 \u7528\u6765\u521b\u5efa\u65b0\u5bf9\u8c61\u7684 \u672c\u5730\u7ebf\u7a0b\u5206\u914d\u7f13\u5b58(Thread Local Allocation Buffer,TLAB) <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : manecocomph <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @liuhuan475 \u8bf4\u7684\u5bf9. TLAB \u662f\u5728\u5806\u4e0a\u5e74\u8f7b\u4ee3\u7684, PLAB \u662f\u5806\u4e0a\u8001\u5e74\u4ee3\u7684. \u90fd\u4e0d\u5c5e\u4e8e\u7ebf\u7a0b\u6808\u7684\u7a7a\u95f4. \u6709\u7a7a\u5199\u4e00\u4e2a TLAB\/PLAB card marking \u7684\u6587\u7ae0. <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"

    Java \u7684\u7ebf\u7a0b\u5230\u5e95\u5360\u7528\u4e86\u591a\u5c11\u5185\u5b58…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/325890"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=325890"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/325890\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=325890"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=325890"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=325890"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}