{"id":280,"date":"2017-06-26T11:20:33","date_gmt":"2017-06-26T03:20:33","guid":{"rendered":"https:\/\/blog.jsjs.org\/?p=280"},"modified":"2017-06-26T11:20:33","modified_gmt":"2017-06-26T03:20:33","slug":"%e4%b9%9f%e7%9c%8blinux%e5%86%85%e5%ad%98%e5%8e%bb%e5%93%aa%e5%84%bf%e4%ba%86","status":"publish","type":"post","link":"https:\/\/blog.jsjs.org\/?p=280","title":{"rendered":"\u4e5f\u770blinux\u5185\u5b58\u53bb\u54ea\u513f\u4e86"},"content":{"rendered":"

\u524d\u4e24\u5929\u4e00\u53f0128G\u5185\u5b58\u7684oracle\u4e3b\u673a\u53d1\u751f\u6545\u969c\u89e6\u53d1kdump\uff0c\u6700\u7ec8\u7531\u4e8evar\u76ee\u5f55\u7a7a\u95f4\u4e0d\u8db3\uff0c\u5bfc\u81f4kdump\u751f\u6210\u4e0d\u5b8c\u5168\u3002\u7ed3\u5408\u4e4b\u524dredhat\u7ed9\u51fa\u7684\u5efa\u8bae\uff0ccrash\u8bbe\u7f6e\u7684\u7a7a\u95f4\u6700\u597d\u5927\u4e8ememory \u7a7a\u95f4\u3002\u5bf9\u6b64\u6211\u4eec\u505a\u4e86\u4e00\u4e2a\u7b80\u5355\u7684\u8ba1\u7b97\uff0c\u8ba4\u4e3akdump\u4e3b\u673a\u751f\u6210\u7684\u662f\u8fd0\u884c\u5728\u5185\u5b58\u91cc\u7684\u4fe1\u606f \uff0c\u867d\u7136\u4e3b\u673a\u6709128G\u7684\u5185\u5b58\uff0c\u4e0d\u8fc7\u901a\u8fc7top\u67e5\u770b\u5e76\u8ba1\u7b97\u540e\u53d1\u73b0\u6211\u5b9e\u9645\u4e0a\u53ea\u4f7f\u75287G\u591a\u7684\u5927\u5c0f\uff0c\u800c\u4f7f\u7528free -m\u67e5\u770b\u65f6\u5df2\u7ecf\u4f7f\u7528\u4e8680G\u5de6\u53f3\u7684\u5185\u5b58 \u3002\u7ad9\u5728DBA\u7684\u89d2\u5ea6\u770b\u7684\u8bdd\uff0c\u8fd9\u90e8\u5206\u5185\u5b58\u63d0\u524d\u5206\u914d\u7ed9\u4e86sga \uff0c\u8c8c\u4f3c\u4e5f\u53ef\u4ee5\u8bb2\u901a\u3002\u8bb0\u5f97\u4e4b\u524d\u770b\u8fc7taobao\u891a\u9738\u5199\u7684\u4e00\u7bc7\u5206\u6790\u3002\u8fd9\u91cc\u518d\u7ed3\u5408\u8be5\u6587\u7ae0\u7b97\u7b97\u3002<\/p>\n

\u901a\u8fc7\u891a\u9738\u7684Linux Used\u5185\u5b58\u5230\u5e95\u54ea\u91cc\u53bb\u4e86<\/a>\uff1f\u6211\u4eec\u5df2\u7ecf\u4e86\u89e3\u5230\u5185\u5b58\u4e3b\u8981\u6d88\u8017\u5728\u4e09\u4e2a\u65b9\u9762\uff1a1. \u8fdb\u7a0b\u6d88\u8017\u3002 2. slab\u6d88\u8017 3.pagetable\u6d88\u8017\u3002<\/p>\n

\u7531\u4e8e\u4e0d\u4fbf\u4e8e\u76f4\u63a5\u5728\u73b0\u7f51oracle\u4e3b\u673a\u4e0a\u8fdb\u884c\u64cd\u4f5c\uff0c\u8fd9\u91cc\u5c31\u4ee5\u672cblog\u7684\u4e91\u4e3b\u673a\u4e3a\u4f8b\u8fdb\u884c\u6d4b\u8bd5\u3002<\/p>\n

\u4e00\u3001\u67e5\u770b\u5df2\u7528\u5185\u5b58\u603b\u91cf<\/p>\n

    \n
  1. [<\/span>root@91it <\/span>~]<\/span># free -m<\/span><\/li>\n
  2. total used free shared buffers cached<\/span><\/li>\n
  3. Mem<\/span>:<\/span> 996<\/span> 908<\/span> 88<\/span> 0<\/span> 174<\/span> 283<\/span><\/li>\n
  4. -\/+<\/span> buffers<\/span>\/<\/span>cache<\/span>:<\/span> 450<\/span> 546<\/span><\/li>\n
  5. Swap<\/span>:<\/span> 0<\/span> 0<\/span> 0<\/span><\/li>\n<\/ol>\n

    \u5173\u4e8e\u5df2\u7528\u5185\u5b58\u548c\u53ef\u7528\u5185\u5b58\u8fd9\u5df2\u7ecf\u662f\u4e00\u4e2a\u8001\u751f\u957f\u8c08\u7684\u95ee\u9898\u4e86\u3002\u8fd9\u91cc\u770b\u5230\u7684\u4fe1\u606f\u5982\u4e0b\uff1a<\/p>\n

    1\u3001\u603b\u5185\u5b58996M \uff0c\u5df2\u7528\u5185\u5b58908M<\/p>\n

    2\u3001\u7531\u4e8ebuffers + cached\u5185\u5b58\u5b9e\u9645\u4e0a\u4e5f\u662f\u53ef\u7528\u5185\u5b58\uff0c\u8be5\u5185\u5b58\u4e5f\u53ef\u4ee5\u901a\u8fc7echo 3 > \/proc\/sys\/vm\/drop_caches \u56de\u6536pagechae\u3001dentries and inodes \uff0c\u6240\u4ee5\u5b9e\u9645\u4e0a\u5df2\u7ecf\u4f7f\u7528\u7684\u5185\u5b58\u662f450M \u3002<\/p>\n

    \u6ce8\uff1a<\/p>\n

    1\u3001\u5173\u4e8e\u5185\u5b58\u7684\u8ba1\u7b97\u65b9\u6cd5\u5c31\u4e0d\u4e0a\u56fe\u4e86\uff0c\u8fd9\u70b9\u53ef\u4ee5\u53c2\u8003\uff1ahttp:\/\/www.redbooks.ibm.com\/redpapers\/pdfs\/redp4285.pdf<\/p>\n

    2\u3001linux\u5185\u5b58\u5f3a\u5236\u56de\u6536\u7684\u65b9\u6cd5\u5177\u4f53\u53ef\u4ee5\u53c2\u8003\uff1alinux \u4e0b \u5f3a\u5236\u56de\u6536\u5185\u5b58<\/a> \u3002<\/p>\n

    \u5373\u7136\u5b9e\u9645\u4f7f\u7528\u4e86450M\u5185\u5b58\uff0c\u90a3\u8fd9450M\u5185\u5b58\u662f\u5982\u4f55\u5206\u914d\u7684\u5462\uff1f<\/p>\n

    \u4e8c\u3001RSS\u5185\u5b58\uff08Resident size\uff09<\/p>\n

    ps\u4e0b\u547d\u4ee4\u4e0b\u7684RSS\u5185\u5b58\u3001top\u5de5\u5177\u4e0b\u7684RES\u5185\u5b58\u90fd\u662f\u6307\u7684\u8fd9\u4e00\u5757\u5185\u5b58\u3002resident set size \u4e5f\u5c31\u662f\u6bcf\u4e2a\u8fdb\u7a0b\u7528\u4e86\u5177\u4f53\u7684\u591a\u5c11\u9875\u7684\u5185\u5b58\u3002\u7531\u4e8elinux\u7cfb\u7edf\u91c7\u7528\u7684\u662f\u865a\u62df\u5185\u5b58\uff0c\u8fdb\u7a0b\u7684\u4ee3\u7801\uff0c\u5e93\uff0c\u5806\u548c\u6808\u4f7f\u7528\u7684\u5185\u5b58\u90fd\u4f1a\u6d88\u8017\u5185\u5b58\uff0c\u4f46\u662f\u7533\u8bf7\u51fa\u6765\u7684\u5185\u5b58\uff0c\u53ea\u8981\u6ca1\u771f\u6b63touch\u8fc7\uff0c\u662f\u4e0d\u7b97\u7684\uff0c\u56e0\u4e3a\u6ca1\u6709\u771f\u6b63\u4e3a\u4e4b\u5206\u914d\u7269\u7406\u9875\u9762\uff0c\u8bf4\u767d\u4e86\u4e5f\u5c31\u662f\u771f\u6b63\u5177\u6709\u201c\u6570\u636e\u9875\u7684\u7269\u7406\u5185\u5b58\u201d\u3002\u6211\u8fd9\u91cc\u4f7f\u7528\u7684\u662f\u4e00\u6bb5\u4ecepython psutil \u6a21\u5757\u91cc\u6f14\u5316\u51fa\u7684\u4e00\u6bb5\u4ee3\u7801\u8fdb\u884c\u8ba1\u7b97\u7684\uff1a<\/p>\n

      \n
    1. [<\/span>root@91it <\/span>~]<\/span># cat vms.py<\/span><\/li>\n
    2. #!\/usr\/bin\/python<\/span><\/li>\n
    3. import<\/span> os<\/span><\/li>\n
    4. def<\/span> get_vms<\/span>(<\/span>pid<\/span>):<\/span><\/li>\n
    5. with<\/span> open<\/span>(<\/span>“\/proc\/%s\/statm”<\/span> %<\/span> pid<\/span>,<\/span> “rb”<\/span>)<\/span> as<\/span> f<\/span>:<\/span><\/li>\n
    6. vms <\/span>=<\/span> f<\/span>.<\/span>readline<\/span>().<\/span>split<\/span>()[<\/span>1<\/span>]<\/span><\/li>\n
    7. return<\/span> int<\/span>(<\/span>vms<\/span>)<\/span><\/li>\n
    8. pids <\/span>=<\/span> [<\/span>int<\/span>(<\/span>x<\/span>)<\/span> for<\/span> x <\/span>in<\/span> os<\/span>.<\/span>listdir<\/span>(<\/span>b<\/span>‘\/proc’<\/span>)<\/span> if<\/span> x<\/span>.<\/span>isdigit<\/span>()]<\/span><\/li>\n
    9. vmss <\/span>=<\/span> [<\/span>get_vms<\/span>(<\/span>pid<\/span>)<\/span> for<\/span> pid <\/span>in<\/span> pids<\/span>]<\/span><\/li>\n
    10. print<\/span> sum<\/span>(<\/span>vmss<\/span>)<\/span> *<\/span> 4<\/span><\/li>\n
    11. [<\/span>root@91it <\/span>~]<\/span># python vms.py<\/span><\/li>\n
    12. 386528<\/span><\/li>\n<\/ol>\n

      \u6ce8\uff1a<\/p>\n

      1\u3001\/proc\/PID\/statm \u7b2c\u4e8c\u5217\u662fRSS\u5185\u5b58\u4f7f\u7528page\u9875\u7684\u591a\u5c11\uff0c\u800c\u5728linux\u4e0b\u9ed8\u8ba4\u4f7f\u7528\u7684page\u9875\u5927\u5c0f\u662f4KB \u3002\u6240\u4ee5\u6211\u4e0a\u9762\u8ba1\u7b97\u6c42\u548c\u540e\uff0c\u6700\u540e\u4e58\u4ee54 \uff0c\u800c\u6211\u6700\u7ec8\u8ba1\u7b97\u51fa\u7684\u7ed3\u679c\u5c31\u662f386528KB \u3002<\/p>\n

      2\u3001\u8fd9\u91cc\u4e5f\u53ef\u4ee5\u901a\u8fc7\/proc\/PID\/status\u91cc\u7684vmRss\u9879\u8fdb\u884c\u6c42\u548c\uff0c\u56e0\u4e3a\u8be5\u9879\u76f4\u63a5\u7ed9\u51fa\u7684\u662fKB\u503c\u3002<\/p>\n

        \n
      1. [<\/span>root@91it <\/span>~]<\/span># cat \/proc\/998\/status<\/span><\/li>\n
      2. Name<\/span>:<\/span> mingetty<\/span><\/li>\n
      3. State<\/span>:<\/span> S <\/span>(<\/span>sleeping<\/span>)<\/span><\/li>\n
      4. Tgid<\/span>:<\/span> 998<\/span><\/li>\n
      5. Pid<\/span>:<\/span> 998<\/span><\/li>\n
      6. PPid<\/span>:<\/span> 1<\/span><\/li>\n
      7. TracerPid<\/span>:<\/span> 0<\/span><\/li>\n
      8. Uid<\/span>:<\/span> 0<\/span> 0<\/span> 0<\/span> 0<\/span><\/li>\n
      9. Gid<\/span>:<\/span> 0<\/span> 0<\/span> 0<\/span> 0<\/span><\/li>\n
      10. Utrace<\/span>:<\/span> 0<\/span><\/li>\n
      11. FDSize<\/span>:<\/span> 64<\/span><\/li>\n
      12. Groups<\/span>:<\/span><\/li>\n
      13. VmPeak<\/span>:<\/span> 4068<\/span> kB<\/span><\/li>\n
      14. VmSize<\/span>:<\/span> 4064<\/span> kB<\/span><\/li>\n
      15. VmLck<\/span>:<\/span> 0<\/span> kB<\/span><\/li>\n
      16. VmHWM<\/span>:<\/span> 556<\/span> kB<\/span><\/li>\n
      17. VmRSS<\/span>:<\/span> 76<\/span> kB<\/span><\/li>\n
      18. \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/span><\/li>\n<\/ol>\n

        \u5f53\u7136\u4e5f\u53ef\u4ee5\u4f7f\u7528shell \u8fdb\u884c\u8ba1\u7b97\uff1a<\/p>\n

          \n
        1. $ cat RSS<\/span>.<\/span>sh<\/span><\/li>\n
        2. #\/bin\/bash<\/span><\/li>\n
        3. for<\/span> PROC <\/span>in<\/span> `ls \/proc\/|grep “^[0-9]”`<\/span><\/li>\n
        4. do<\/span><\/li>\n
        5. if<\/span> [<\/span> –<\/span>f <\/span>\/<\/span>proc<\/span>\/<\/span>$PROC<\/span>\/<\/span>statm <\/span>];<\/span> then<\/span><\/li>\n
        6. TEP<\/span>=<\/span>`cat \/proc\/$PROC\/statm | awk ‘{print ($2)}’`<\/span><\/li>\n
        7. RSS<\/span>=<\/span>`expr $RSS + $TEP`<\/span><\/li>\n
        8. fi<\/span><\/li>\n
        9. done<\/span><\/li>\n
        10. RSS<\/span>=<\/span>`expr $RSS \\* 4`<\/span><\/li>\n
        11. echo $RSS<\/span>“KB”<\/span><\/li>\n<\/ol>\n

          rss\u5185\u5b58\u90e8\u5206\uff0c\u5177\u4f53\u53ef\u4ee5\u67e5\u770bman proc\u624b\u518c\u6216kernl \u9875\u7684\u4ecb\u7ecd<\/a> \uff0c\u4ee5\u4e0b\u662fman proc \u91cc\u7684\u90e8\u5206\u63d0\u53d6\uff1a<\/p>\n

            \n
          1. \/<\/span>proc<\/span>\/[<\/span>pid<\/span>]\/<\/span>statm<\/span><\/li>\n
          2. Provides<\/span> information about memory usage<\/span>,<\/span> measured <\/span>in<\/span> pages<\/span>.<\/span> The<\/span><\/li>\n
          3. columns are<\/span>:<\/span><\/li>\n
          4. size total program size<\/span><\/li>\n
          5. (<\/span>same <\/span>as<\/span> VmSize<\/span> in<\/span> \/<\/span>proc<\/span>\/[<\/span>pid<\/span>]\/<\/span>status<\/span>)<\/span><\/li>\n
          6. resident resident <\/span>set<\/span> size<\/span><\/li>\n
          7. (<\/span>same <\/span>as<\/span> VmRSS<\/span> in<\/span> \/<\/span>proc<\/span>\/[<\/span>pid<\/span>]\/<\/span>status<\/span>)<\/span><\/li>\n
          8. share shared pages <\/span>(<\/span>from<\/span> shared mappings<\/span>)<\/span><\/li>\n
          9. text text <\/span>(<\/span>code<\/span>)<\/span><\/li>\n
          10. lib library <\/span>(<\/span>unused <\/span>in<\/span> Linux<\/span> 2.6<\/span>)<\/span><\/li>\n
          11. data data <\/span>+<\/span> stack<\/span><\/li>\n
          12. dt dirty pages <\/span>(<\/span>unused <\/span>in<\/span> Linux<\/span> 2.6<\/span>)<\/span><\/li>\n<\/ol>\n

            \u4e8c\u3001slab\u5185\u5b58<\/p>\n

            slab\u5185\u5b58\u7684\u4f5c\u7528\u662f\u5185\u6838\u4e3a\u4e86\u9ad8\u6027\u80fd\u6bcf\u4e2a\u9700\u8981\u91cd\u590d\u4f7f\u7528\u7684\u5bf9\u8c61\u90fd\u4f1a\u6709\u4e2a\u6c60\uff0c\u8fd9\u4e2aslab\u6c60\u4f1acache\u5927\u91cf\u5e38\u7528\u7684\u5bf9\u8c61\uff0c\u6240\u4ee5\u4f1a\u6d88\u8017\u5927\u91cf\u7684\u5185\u5b58\u3002\u5177\u4f53\u53ef\u4ee5\u8fd0\u884cslabtop\u547d\u4ee4\u67e5\u770b\u3002<\/p>\n

            \"\"<\/p>\n

            slab\u5185\u5b58\u7684\u6d88\u8017\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\/proc\/slabinfo\u6587\u4ef6\u7b97\u51fa\uff0c\u5177\u811a\u672c\u4e3a\uff1a<\/p>\n

              \n
            1. # echo `cat \/proc\/slabinfo |awk ‘BEGIN{sum=0;}{sum=sum+$3*$4;}END{print sum\/1024\/1024}’` MB<\/span><\/li>\n
            2. 74.7215<\/span> MB<\/span><\/li>\n<\/ol>\n

              \u4e09\u3001PageTables\u5185\u5b58<\/p>\n

              \u8fd9\u90e8\u5206\u5185\u5b58\u6211\u5e76\u6ca1\u6709\u7ec6\u7814\u7a76\uff0c\u8fd9\u91cc\u5c31\u76f4\u63a5\u62c9taobao\u4e0a\u5404\u4f4d\u5927\u725b\u7684\u8bf4\u6cd5\u7528\u5427\uff1a\u201cstruct page\u4e5f\u6709\u4e00\u5b9a\u7684\u5927\u5c0f\uff08\u6bcf\u4e2a\u9875\u4e00\u4e2a,64bytes\uff09\uff0c\u5982\u679c\u662f2.6.32\u7684\u8bdd\uff0c\u6bcf\u4e2a\u9875\u8fd8\u6709\u4e00\u4e2apage_cgroup(32bytes)\uff0c\u4e5f\u5c31\u662f\u8bf4\u5185\u5b58\u5927\u5c0f\u76842.3%(96\/4096)\u4f1a\u88ab\u5185\u6838\u56fa\u5b9a\u4f7f\u7528 \u3002struct page\u662f\u7cfb\u7edfboot\u7684\u65f6\u5019\u5c31\u4f1a\u6839\u636e\u5185\u5b58\u5927\u5c0f\u7b97\u51fa\u6765\u5206\u914d\u51fa\u53bb\u7684\uff0c18\u5185\u6838\u662f1.56%\u5de6\u53f3\uff0c32\u5185\u6838\u7531\u4e8ecgroup\u7684\u539f\u56e0\u4f1a\u57282.3% \u3002\u201d<\/p>\n

              \u800c\u5177\u4f53\u6d88\u8017\u53ef\u4ee5\u901a\u8fc7\/proc\/meminfo\u91cc\u7684pagetables\u9879\u83b7\u53d6\uff0c\u811a\u672c\u5982\u4e0b\uff1a<\/p>\n

                \n
              1. # echo `grep PageTables \/proc\/meminfo | awk ‘{print $2}’` KB<\/span><\/li>\n
              2. 4476<\/span> KB<\/span><\/li>\n<\/ol>\n

                \u7cfb\u7edf\u7684\u786c\u5f00\u9500\u5360\u6bd4\u5e76\u4e0d\u591a\u3002<\/p>\n

                \u56db\u3001\u7b97\u7b97\u603b\u5e10<\/p>\n

                \u4e09\u8005\u52a0\u8d77\u6765\u53d1\u73b0\u8981\u5927\u4e8e450M \u3002\u8fd9\u91cc\u6211\u4eec\u4fbf\u4e8e\u67e5\u770b\uff0c\u518d\u8dd1\u4e0b\u811a\u672c\uff1a<\/p>\n

                  \n
                1. $ cat cm<\/span>.<\/span>sh<\/span><\/li>\n
                2. #\/bin\/bash<\/span><\/li>\n
                3. for<\/span> PROC <\/span>in<\/span> `ls \/proc\/|grep “^[0-9]”`<\/span><\/li>\n
                4. do<\/span><\/li>\n
                5. if<\/span> [<\/span> –<\/span>f <\/span>\/<\/span>proc<\/span>\/<\/span>$PROC<\/span>\/<\/span>statm <\/span>];<\/span> then<\/span><\/li>\n
                6. TEP<\/span>=<\/span>`cat \/proc\/$PROC\/statm | awk ‘{print ($2)}’`<\/span><\/li>\n
                7. RSS<\/span>=<\/span>`expr $RSS + $TEP`<\/span><\/li>\n
                8. fi<\/span><\/li>\n
                9. done<\/span><\/li>\n
                10. RSS<\/span>=<\/span>`expr $RSS \\* 4`<\/span><\/li>\n
                11. PageTable<\/span>=<\/span>`grep PageTables \/proc\/meminfo | awk ‘{print $2}’`<\/span><\/li>\n
                12. SlabInfo<\/span>=<\/span>`cat \/proc\/slabinfo |awk ‘BEGIN{sum=0;}{sum=sum+$3*$4;}END{print sum\/1024\/1024}’`<\/span><\/li>\n
                13. echo $RSS<\/span>“KB”<\/span>,<\/span> $PageTable<\/span>“KB”<\/span>,<\/span> $SlabInfo<\/span>“MB”<\/span><\/li>\n
                14. printf <\/span>“rss+pagetable+slabinfo=%sMB\\n”<\/span> `echo $RSS\/1024 + $PageTable\/1024 + $SlabInfo|bc`<\/span><\/li>\n
                15. free <\/span>–<\/span>m<\/span><\/li>\n
                16. $ <\/span>.\/<\/span>cm<\/span>.<\/span>sh<\/span><\/li>\n
                17. 382048KB<\/span>,<\/span> 4528KB<\/span>,<\/span> 74.8561MB<\/span><\/li>\n
                18. rss<\/span>+<\/span>pagetable<\/span>+<\/span>slabinfo<\/span>=<\/span>451.8561MB<\/span><\/li>\n
                19. total used free shared buffers cached<\/span><\/li>\n
                20. Mem<\/span>:<\/span> 996<\/span> 842<\/span> 154<\/span> 0<\/span> 106<\/span> 376<\/span><\/li>\n
                21. -\/+<\/span> buffers<\/span>\/<\/span>cache<\/span>:<\/span> 359<\/span> 637<\/span><\/li>\n
                22. Swap<\/span>:<\/span> 0<\/span> 0<\/span> 0<\/span><\/li>\n<\/ol>\n

                  \u7531\u4e8e\u4e0a\u9762\u6f14\u793a\u65f6\uff0c\u6211\u5f3a\u5236\u56de\u6536\u8fc7\u5185\u5b58\u3002\u76ee\u524d\u5b9e\u9645\u5df2\u7528\u5185\u5b58\u4e3a359M \uff0c\u800c\u6211\u4eec\u4e0a\u9762\u4e09\u8005\u4e4b\u548c\u662f451M\uff0c\u6bd4\u5b9e\u9645\u4f7f\u7528\u7684\u5927\u4e86100M\u5de6\u53f3\u3002<\/p>\n

                  \u591a\u51fa\u7684\u8fd9\u90e8\u5206\u5185\u5b58\u662f\u6211\u4eec\u5728\u8ba1\u7b97rss\u5185\u5b58\u65f6\u7b97\u91cd\u590d\u4e86\u3002\u56e0\u4e3arss\u5185\u5b58\u5305\u62ec\u6211\u4eec\u4f7f\u7528\u7684\u5404\u79cd\u5e93\u548cso\u7b49\u5171\u4eab\u7684\u6a21\u5757\u3002\u5177\u4f53\u53ef\u4ee5\u4f7f\u7528pmap\u6307\u4ee4\u67e5\u770b\u8be6\u7ec6\u7684\u6bcf\u4e2a\u8fdb\u7a0b\u8c03\u7528\u7684lib\u5e93\u53ca\u5df2\u7528\u5185\u5b58\u503c\u3002\u8fd9\u91cc\u4ee5\u6700\u7b80\u5355\u7684bash\u8fdb\u7a0b\u4e3a\u4f8b\u3002<\/p>\n

                    \n
                  1. [<\/span>root@91it <\/span>~]<\/span># pmap `pgrep bash`<\/span><\/li>\n
                  2. 1464<\/span>:<\/span> –<\/span>bash<\/span><\/li>\n
                  3. 0000000000400000<\/span> 848K<\/span> r<\/span>–<\/span>x<\/span>—<\/span> \/<\/span>bin<\/span>\/<\/span>bash<\/span><\/li>\n
                  4. 00000000006d3000<\/span> 40K<\/span> rw<\/span>—<\/span> \/<\/span>bin<\/span>\/<\/span>bash<\/span><\/li>\n
                  5. 00000000006dd000<\/span> 20K<\/span> rw<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  6. 00000000008dc000<\/span> 36K<\/span> rw<\/span>—<\/span> \/<\/span>bin<\/span>\/<\/span>bash<\/span><\/li>\n
                  7. 00000000011a4000<\/span> 396K<\/span> rw<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  8. 0000003ef9800000<\/span> 128K<\/span> r<\/span>–<\/span>x<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>ld<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  9. 0000003ef9a1f000<\/span> 4K<\/span> r<\/span>—-<\/span> \/<\/span>lib64<\/span>\/<\/span>ld<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  10. 0000003ef9a20000<\/span> 4K<\/span> rw<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>ld<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  11. 0000003ef9a21000<\/span> 4K<\/span> rw<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  12. 0000003ef9c00000<\/span> 1576K<\/span> r<\/span>–<\/span>x<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>libc<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  13. 0000003ef9d8a000<\/span> 2048K<\/span> —–<\/span> \/<\/span>lib64<\/span>\/<\/span>libc<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  14. 0000003ef9f8a000<\/span> 16K<\/span> r<\/span>—-<\/span> \/<\/span>lib64<\/span>\/<\/span>libc<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  15. 0000003ef9f8e000<\/span> 4K<\/span> rw<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>libc<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  16. 0000003ef9f8f000<\/span> 20K<\/span> rw<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  17. 0000003efa400000<\/span> 8K<\/span> r<\/span>–<\/span>x<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>libdl<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  18. 0000003efa402000<\/span> 2048K<\/span> —–<\/span> \/<\/span>lib64<\/span>\/<\/span>libdl<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  19. 0000003efa602000<\/span> 4K<\/span> r<\/span>—-<\/span> \/<\/span>lib64<\/span>\/<\/span>libdl<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  20. 0000003efa603000<\/span> 4K<\/span> rw<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>libdl<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  21. 0000003efb800000<\/span> 116K<\/span> r<\/span>–<\/span>x<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>libtinfo<\/span>.<\/span>so<\/span>.<\/span>5.7<\/span><\/li>\n
                  22. 0000003efb81d000<\/span> 2048K<\/span> —–<\/span> \/<\/span>lib64<\/span>\/<\/span>libtinfo<\/span>.<\/span>so<\/span>.<\/span>5.7<\/span><\/li>\n
                  23. 0000003efba1d000<\/span> 16K<\/span> rw<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>libtinfo<\/span>.<\/span>so<\/span>.<\/span>5.7<\/span><\/li>\n
                  24. 00007f1a42fc8000<\/span> 96836K<\/span> r<\/span>—-<\/span> \/<\/span>usr<\/span>\/<\/span>lib<\/span>\/<\/span>locale<\/span>\/<\/span>locale<\/span>–<\/span>archive<\/span><\/li>\n
                  25. 00007f1a48e59000<\/span> 48K<\/span> r<\/span>–<\/span>x<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>libnss_files<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  26. 00007f1a48e65000<\/span> 2048K<\/span> —–<\/span> \/<\/span>lib64<\/span>\/<\/span>libnss_files<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  27. 00007f1a49065000<\/span> 4K<\/span> r<\/span>—-<\/span> \/<\/span>lib64<\/span>\/<\/span>libnss_files<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  28. 00007f1a49066000<\/span> 4K<\/span> rw<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>libnss_files<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  29. 00007f1a49067000<\/span> 12K<\/span> rw<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  30. 00007f1a4906b000<\/span> 8K<\/span> rw<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  31. 00007f1a4906d000<\/span> 28K<\/span> r<\/span>—<\/span>s<\/span>–<\/span> \/<\/span>usr<\/span>\/<\/span>lib64<\/span>\/<\/span>gconv<\/span>\/<\/span>gconv<\/span>–<\/span>modules<\/span>.<\/span>cache<\/span><\/li>\n
                  32. 00007f1a49074000<\/span> 4K<\/span> rw<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  33. 00007fff48189000<\/span> 84K<\/span> rw<\/span>—<\/span> [<\/span> stack <\/span>]<\/span><\/li>\n
                  34. 00007fff481ff000<\/span> 4K<\/span> r<\/span>–<\/span>x<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  35. ffffffffff600000 <\/span>4K<\/span> r<\/span>–<\/span>x<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  36. total <\/span>108472K<\/span><\/li>\n
                  37. 2757<\/span>:<\/span> –<\/span>bash<\/span><\/li>\n
                  38. 0000000000400000<\/span> 848K<\/span> r<\/span>–<\/span>x<\/span>—<\/span> \/<\/span>bin<\/span>\/<\/span>bash<\/span><\/li>\n
                  39. 00000000006d3000<\/span> 40K<\/span> rw<\/span>—<\/span> \/<\/span>bin<\/span>\/<\/span>bash<\/span><\/li>\n
                  40. 00000000006dd000<\/span> 20K<\/span> rw<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  41. 00000000008dc000<\/span> 36K<\/span> rw<\/span>—<\/span> \/<\/span>bin<\/span>\/<\/span>bash<\/span><\/li>\n
                  42. 0000000001385000<\/span> 396K<\/span> rw<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  43. 0000003ef9800000<\/span> 128K<\/span> r<\/span>–<\/span>x<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>ld<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  44. 0000003ef9a1f000<\/span> 4K<\/span> r<\/span>—-<\/span> \/<\/span>lib64<\/span>\/<\/span>ld<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  45. 0000003ef9a20000<\/span> 4K<\/span> rw<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>ld<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  46. 0000003ef9a21000<\/span> 4K<\/span> rw<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  47. 0000003ef9c00000<\/span> 1576K<\/span> r<\/span>–<\/span>x<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>libc<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  48. 0000003ef9d8a000<\/span> 2048K<\/span> —–<\/span> \/<\/span>lib64<\/span>\/<\/span>libc<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  49. 0000003ef9f8a000<\/span> 16K<\/span> r<\/span>—-<\/span> \/<\/span>lib64<\/span>\/<\/span>libc<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  50. 0000003ef9f8e000<\/span> 4K<\/span> rw<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>libc<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  51. 0000003ef9f8f000<\/span> 20K<\/span> rw<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  52. 0000003efa400000<\/span> 8K<\/span> r<\/span>–<\/span>x<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>libdl<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  53. 0000003efa402000<\/span> 2048K<\/span> —–<\/span> \/<\/span>lib64<\/span>\/<\/span>libdl<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  54. 0000003efa602000<\/span> 4K<\/span> r<\/span>—-<\/span> \/<\/span>lib64<\/span>\/<\/span>libdl<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  55. 0000003efa603000<\/span> 4K<\/span> rw<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>libdl<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  56. 0000003efb800000<\/span> 116K<\/span> r<\/span>–<\/span>x<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>libtinfo<\/span>.<\/span>so<\/span>.<\/span>5.7<\/span><\/li>\n
                  57. 0000003efb81d000<\/span> 2048K<\/span> —–<\/span> \/<\/span>lib64<\/span>\/<\/span>libtinfo<\/span>.<\/span>so<\/span>.<\/span>5.7<\/span><\/li>\n
                  58. 0000003efba1d000<\/span> 16K<\/span> rw<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>libtinfo<\/span>.<\/span>so<\/span>.<\/span>5.7<\/span><\/li>\n
                  59. 00007fda04cb1000<\/span> 96836K<\/span> r<\/span>—-<\/span> \/<\/span>usr<\/span>\/<\/span>lib<\/span>\/<\/span>locale<\/span>\/<\/span>locale<\/span>–<\/span>archive<\/span><\/li>\n
                  60. 00007fda0ab42000<\/span> 48K<\/span> r<\/span>–<\/span>x<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>libnss_files<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  61. 00007fda0ab4e000<\/span> 2048K<\/span> —–<\/span> \/<\/span>lib64<\/span>\/<\/span>libnss_files<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  62. 00007fda0ad4e000<\/span> 4K<\/span> r<\/span>—-<\/span> \/<\/span>lib64<\/span>\/<\/span>libnss_files<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  63. 00007fda0ad4f000<\/span> 4K<\/span> rw<\/span>—<\/span> \/<\/span>lib64<\/span>\/<\/span>libnss_files<\/span>–<\/span>2.12<\/span>.<\/span>so<\/span><\/li>\n
                  64. 00007fda0ad50000<\/span> 12K<\/span> rw<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  65. 00007fda0ad54000<\/span> 8K<\/span> rw<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  66. 00007fda0ad56000<\/span> 28K<\/span> r<\/span>—<\/span>s<\/span>–<\/span> \/<\/span>usr<\/span>\/<\/span>lib64<\/span>\/<\/span>gconv<\/span>\/<\/span>gconv<\/span>–<\/span>modules<\/span>.<\/span>cache<\/span><\/li>\n
                  67. 00007fda0ad5d000<\/span> 4K<\/span> rw<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  68. 00007fff0e9e0000<\/span> 84K<\/span> rw<\/span>—<\/span> [<\/span> stack <\/span>]<\/span><\/li>\n
                  69. 00007fff0e9ff000<\/span> 4K<\/span> r<\/span>–<\/span>x<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  70. ffffffffff600000 <\/span>4K<\/span> r<\/span>–<\/span>x<\/span>—<\/span> [<\/span> anon <\/span>]<\/span><\/li>\n
                  71. total <\/span>108472K<\/span><\/li>\n<\/ol>\n

                    \u4ece\u4e0a\u9762\u7684\u6307\u4ee4\u4e0a\u770b\u51fa\uff0cpid\u4e3a1464\u548c2757\u4e24\u4e2a\u8fdb\u7a0b\u4f7f\u7528\u5f88\u591a\u76f8\u540c\u7684so\u6587\u4ef6\uff0c\u800c\u4e14\u5176\u5185\u5b58\u5730\u5740\u4e5f\u76f8\u540c\u3002\u8fd9\u91cc\u4e2a\u4eba\u8ba4\u4e3arss\u90e8\u5206\u7684\u5185\u5b58\u7406\u8bba\u4e0a\u662f\u53ef\u4ee5\u5b8c\u5168\u8ba1\u7b97\u51c6\u786e\u7684\u3002\u505a\u6cd5\u5c31\u662f\u5148\u904d\u5386\/proc\u4e0b\u6240\u6709\u7684pid\uff0c\u518dpmap\u6240\u6709pid\uff0c\u5bf9\u6240\u6709\u7684\u8f93\u51fa\u7ed3\u679c\u8fdb\u884c\u6c47\u603b\u540e\u53bb\u91cd\u3002\u518d\u5c06\u7b2c\u4e8c\u5217\u7684\u5360\u7528\u5185\u5b58\u503c\u6c42\u548c\uff08\u5177\u4f53\u4e5f\u53ef\u4ee5\u8003\u8651\u4ece\/proc\/pid\/smaps\u6587\u4ef6\u5165\u624b \uff09\u3002<\/p>\n

                    \u4e94\u3001\u5176\u4ed6\u60c5\u51b5<\/p>\n

                    \u5728\u7b2c\u56db\u6b65\u7b97\u7b97\u603b\u5e10\u4e2d\uff0c\u6211\u4eec\u770b\u51fa rrs\u5185\u5b58 + slab\u5185\u5b58 + pagetables\u5185\u5b58 > \u5b9e\u9645\u5df2\u7528\u5185\u5b58\u3002\u4f46\u8be5\u60c5\u51b5\u5e76\u975e\u662f\u7edd\u5bf9\u7684\uff0c\u4e5f\u6709\u4f8b\u5916\u3002\u5728\u6211\u4e0a\u9762\u63d0\u5230\u7684oracle \u4f7f\u7528\u573a\u666f\u4e0b\uff0c\u4e8b\u5148\u5206\u914d\u4e8670g\u5de6\u53f3\u7684oracle sga \u7a7a\u95f4\uff08\u5373\u5185\u5b58\u7a7a\u95f4\uff09\u3002\u800c\u4e09\u8005\u76f8\u52a0\u8981\u8fdc\u8fdc\u5c0f\u4e8e\u5b9e\u9645\u4f7f\u7528\u7684\u7269\u7406\u5185\u5b58\u3002\u8fd9\u53c8\u8981\u600e\u4e48\u89e3\u91ca\u5462\uff1f\u518d\u53bb\u9664cache\u548cbuffer\u7684\u7a7a\u95f4\u4e5f\u8981\u8fdc\u8fdc\u5c0f\u4e8e\u5b9e\u9645\u4f7f\u7528\u7684\u5185\u5b58\u3002<\/p>\n

                      \n
                    1. [<\/span>root@irora04s <\/span>~]<\/span># free -m<\/span><\/li>\n
                    2. total used free shared buffers cached<\/span><\/li>\n
                    3. Mem<\/span>:<\/span> 129023<\/span> 100024<\/span> 28999<\/span> 0<\/span> 885<\/span> 12595<\/span><\/li>\n
                    4. -\/+<\/span> buffers<\/span>\/<\/span>cache<\/span>:<\/span> 86543<\/span> 42480<\/span><\/li>\n
                    5. Swap<\/span>:<\/span> 24575<\/span> 0<\/span> 24575<\/span><\/li>\n
                    6. [<\/span>root@irora04s <\/span>~]<\/span># sh \/tmp\/mem.sh<\/span><\/li>\n
                    7. 4339696KB<\/span>,<\/span> 66056KB<\/span>,<\/span> 745.805MB<\/span><\/li>\n
                    8. rss<\/span>+<\/span>pagetable<\/span>+<\/span>slabinfo<\/span>=<\/span>5046.805MB<\/span><\/li>\n
                    9. total used free shared buffers cached<\/span><\/li>\n
                    10. Mem<\/span>:<\/span> 129023<\/span> 100096<\/span> 28926<\/span> 0<\/span> 885<\/span> 12597<\/span><\/li>\n
                    11. -\/+<\/span> buffers<\/span>\/<\/span>cache<\/span>:<\/span> 86614<\/span> 42409<\/span><\/li>\n
                    12. Swap<\/span>:<\/span> 24575<\/span> 0<\/span> 24575<\/span><\/li>\n<\/ol>\n

                      \u6211\u4e2a\u4eba\u7684\u7406\u89e3\u662f\u4e8b\u5148\u5206\u914d\u7684\u8fd9\u90e8\u5206sga\u5185\u5b58\uff0c\u5927\u90e8\u5206\u662f\u7a7apage\u9875\uff0c\u5728\u672a\u4f7f\u7528\u65f6\u867d\u7136\u7a7a\u95f4\u88ab\u5360\u7528\u4e86\uff0c\u4f46\u8be5\u5185\u5b58\u5730\u5740\u5185\u5e76\u4e0d\u5b58\u5728\u6570\u636e\u3002\u6240\u4ee5\u4e00\u65e6\u8be5\u673a\u89e6\u53d1kdump \u65f6\uff0ccrash \u7684\u5185\u5b58\u7a7a\u95f4\u5360\u7528\u7684\u78c1\u76d8\u7a7a\u95f4 \u63a5\u8fd1\u4e8erss+pagetable+slabinfo \uff0c\u5c0f\u4e8erss+pagetable+slabinfo+buffers+cached \u3002<\/p>\n

                      \u6700\u540e\u8fd9\u91cc\u540c\u6837\u63a8\u8350\u6709\u65f6\u95f4\u770b\u4e0bnmon\u7684\u6e90\u7801\u3002\u56e0\u4e3a\u4ecenmon\u7684\u5185\u5b58\u7edf\u8ba1\u4fe1\u606f\u6765\u770b\uff0c\u66f4\u4fbf\u4e8e\u7406\u89e3\u5185\u5b58\u7684\u51e0\u4e2a\u53bb\u5411\uff1a<\/p>\n

                      \"\"<\/p>\n

                      <\/div>\n","protected":false},"excerpt":{"rendered":"

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[…]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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