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diff --git a/PrideandPrejudice.png b/PrideandPrejudice.png
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"),n("p",[n("em",[t._v("Core was generated by `./test6'.")])]),t._v(" "),n("p",[n("em",[t._v("Program terminated with signal 11, Segmentation fault.")])]),t._v(" "),n("p",[n("em",[t._v("#0 0x0000000000400554 in sub () at test6.c:12")])]),t._v(" "),n("p",[n("em",[t._v('12 printf("%d", *p);')])]),t._v(" "),n("p",[n("em",[t._v("(gdb) bt -------------")]),t._v(" 显示栈信息")]),t._v(" "),n("p",[n("em",[t._v("#0 0x0000000000400554 in sub () at test6.c:12")])]),t._v(" "),n("p",[n("em",[t._v("#1 0x0000000000400539 in main () at test6.c:5")])]),t._v(" "),n("p",[n("em",[t._v("(gdb)")])]),t._v(" "),n("p",[t._v("可以看到最后入栈的是sub函数里、位于test6.c文件第12行。所以core dump的问题可能出在这里。")]),t._v(" "),n("h1",{attrs:{id:"_10-gdb调试"}},[n("a",{staticClass:"header-anchor",attrs:{href:"#_10-gdb调试"}},[t._v("#")]),t._v(" 10 gdb调试")]),t._v(" "),n("h2",{attrs:{id:"_10-1-命令介绍"}},[n("a",{staticClass:"header-anchor",attrs:{href:"#_10-1-命令介绍"}},[t._v("#")]),t._v(" 10.1 命令介绍")]),t._v(" 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"),n("li",[n("p",[t._v("对指定进程11662，在其neigh.c:1235行的BUG_ON(1)处设置断点，生成core文件。")]),t._v(" "),n("p",[t._v("说明：这种方式生成的core文件不同于由内核生成的/SE/core--PID，它含有共享内存的绝大部分数据，便于深入分析。须注意的是这种core文件一般较大，可能达到几个GB，因此要保证足够的存储空间；存储可能需要十几秒或几十秒。若不指定文件名，则在当前目录下生成名为core.PID的core文件（此时可提前cd到/SE下）。")]),t._v(" "),n("p",[t._v("gdb -c 'b neigh.c:1235; commands; silent; gcore /home/luo/workspace/core-neigh.11662; c; end; c' -i 11662")])]),t._v(" "),n("li",[n("p",[t._v("对指定进程11662，在其ut函数处设置断点，每个报文到来则打印tbuf信息。")])])]),t._v(" "),n("p",[t._v("说明：对单个进程，不存在串行/并行的区别，可按串行处理。")]),t._v(" "),n("p",[t._v("gdb -c 'b ut; commands; silent; p/x *tbuf; c; end; c' -i 11662")]),t._v(" "),n("ol",[n("li",[t._v("打开分片重组部分的调试开关debug_ip4_frag_recv、debug_ip4_mtu_send。")])]),t._v(" "),n("p",[t._v("说明：这两个变量都为共享数据，只需设置单个即可，如pid为11662。")]),t._v(" "),n("p",[t._v("gdb -c 'set debug_ip4_frag_recv=1; set debug_ip4_mtu_send=1; printf \"recv=%d,send=%d\",debug_ip4_frag_recv,debug_ip4_mtu_send' -i 11662")]),t._v(" "),n("ol",[n("li",[t._v("对所有进程设置条件指令断点，触发后执行指定命令，执行命令后继续执行不退出。")])]),t._v(" "),n("p",[t._v("说明：对于涉及多的有断点场景，应使用并行模式。")]),t._v(" "),n("p",[t._v("gdb -p -c 'b test.c:22 if cnt%6==4; commands; silent; echo --trace--\\n; bt; printf \"\\nname=%s cnt=%d\\n\", name, cnt; c; end; c'")]),t._v(" "),n("p",[t._v("该命令序列也可写入命令文件：（-f /tmp/a.gdb）")]),t._v(" "),n("p",[t._v("handle all noprint nostop")]),t._v(" "),n("p",[t._v("b test.c:22 if cnt%6==4")]),t._v(" "),n("p",[t._v("commands")]),t._v(" "),n("p",[t._v("silent")]),t._v(" "),n("p",[t._v("echo --trace--\\n")]),t._v(" "),n("p",[t._v("bt")]),t._v(" "),n("p",[t._v('printf "\\nname=%s cnt=%d\\n", name, cnt')]),t._v(" "),n("p",[t._v("c")]),t._v(" "),n("p",[t._v("end")]),t._v(" "),n("p",[t._v("c")]),t._v(" "),n("p",[t._v("[注]：最后的c命令，使得设完断点及commands后继续运行，倒数第二条c命令，使得断点触发/处理后仍继续运行。")]),t._v(" "),n("ol",[n("li",[n("p",[t._v("对所有进程设置数据断点，当数值被改变时，打印CallTrace。")]),t._v(" "),n("p",[t._v("说明：watch可监控数据是否被改变，rwatch可监控数据是否被读取，awatch包括这两类。")]),t._v(" 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"),n("p",[t._v("说明：phy_dev为共享数据，因此只需查看单个即可，如pid为11662。命令序列略繁，可写入命令文件。")]),t._v(" "),n("p",[t._v("gdb -f /tmp/dev.gdb -i 11662")]),t._v(" "),n("p",[t._v("脚本/tmp/dev.gdb内容如下：")]),t._v(" "),n("p",[t._v("handle all noprint nostop")]),t._v(" "),n("p",[t._v("set print pretty")]),t._v(" "),n("p",[t._v("set $idx=26")]),t._v(" "),n("p",[t._v("set $i=0")]),t._v(" "),n("p",[t._v("while ($i<256)")]),t._v(" "),n("p",[t._v("set $d = (struct dev*)phy_dev[$i]")]),t._v(" "),n("p",[t._v("if ($d == 0)")]),t._v(" "),n("p",[t._v("loop_break")]),t._v(" "),n("p",[t._v("end")]),t._v(" "),n("p",[t._v("if ($d->ifindex==$idx)")]),t._v(" "),n("p",[t._v("p/x *$d")]),t._v(" "),n("p",[t._v("loop_break")]),t._v(" "),n("p",[t._v("end")]),t._v(" "),n("p",[t._v("set $i = $i+1")]),t._v(" "),n("p",[t._v("end")])]),t._v(" "),n("li",[n("p",[t._v("查看挂接在链表mirror_filter_list上的每个filter节点。")])])]),t._v(" "),n("p",[t._v("说明：mirror_filter_list为共享数据，因此只需查看单个即可，如pid为11662。")]),t._v(" "),n("p",[t._v("gdb -f /tmp/mirror_filter.gdb -i 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\ No newline at end of file
diff --git a/assets/js/14.21bcebc4.js b/assets/js/14.21bcebc4.js
new file mode 100644
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--- /dev/null
+++ b/assets/js/14.21bcebc4.js
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diff --git a/assets/js/15.cc9f2f8e.js b/assets/js/15.cc9f2f8e.js
new file mode 100644
index 0000000..9e963ac
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+++ b/assets/js/15.cc9f2f8e.js
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<------------------------------------ 使用pmap查看内存映射\n2132: /root/workspace/memtest/memtest\nAddress Kbytes RSS Dirty Mode Mapping\n0000555555554000 4 4 4 r---- memtest\n0000555555555000 4 4 4 r-x-- memtest\n0000555555556000 4 4 0 r---- memtest\n0000555555557000 4 4 4 r---- memtest\n0000555555558000 4 4 4 rw--- memtest\n0000555555559000 396 324 324 rw--- [ anon ] <------堆内存地址\n00007ffff7a7d000 16 16 16 rw--- [ anon ]\n00007ffff7a81000 12 12 0 r---- libgcc_s.so.1\n00007ffff7a84000 72 72 0 r-x-- libgcc_s.so.1\n00007ffff7a96000 16 16 0 r---- libgcc_s.so.1\n00007ffff7a9a000 4 4 4 r---- libgcc_s.so.1\n00007ffff7a9b000 4 4 4 rw--- libgcc_s.so.1\n00007ffff7a9c000 52 52 0 r---- libm-2.31.so\n00007ffff7aa9000 668 256 0 r-x-- libm-2.31.so\n00007ffff7b50000 612 0 0 r---- libm-2.31.so\n00007ffff7be9000 4 4 4 r---- libm-2.31.so\n00007ffff7bea000 4 4 4 rw--- libm-2.31.so\n00007ffff7beb000 136 136 0 r---- libc-2.31.so\n00007ffff7c0d000 1504 848 8 r-x-- libc-2.31.so\n00007ffff7d85000 312 172 0 r---- libc-2.31.so\n00007ffff7dd3000 16 16 16 r---- libc-2.31.so\n00007ffff7dd7000 8 8 8 rw--- libc-2.31.so\n00007ffff7dd9000 16 12 12 rw--- [ anon ]\n00007ffff7ddd000 600 600 0 r---- libstdc++.so.6.0.28\n00007ffff7e73000 964 628 4 r-x-- libstdc++.so.6.0.28\n00007ffff7f64000 292 164 0 r---- libstdc++.so.6.0.28\n00007ffff7fad000 4 0 0 ----- libstdc++.so.6.0.28\n00007ffff7fae000 44 44 44 r---- libstdc++.so.6.0.28\n00007ffff7fb9000 12 12 12 rw--- libstdc++.so.6.0.28\n00007ffff7fbc000 20 20 20 rw--- [ anon ]\n00007ffff7fcb000 12 0 0 r---- [ anon ]\n00007ffff7fce000 4 4 4 r-x-- [ anon ]\n00007ffff7fcf000 4 4 0 r---- ld-2.31.so\n00007ffff7fd0000 140 140 24 r-x-- ld-2.31.so\n00007ffff7ff3000 32 32 0 r---- ld-2.31.so\n00007ffff7ffc000 4 4 4 r---- ld-2.31.so\n00007ffff7ffd000 4 4 4 rw--- ld-2.31.so\n00007ffff7ffe000 4 4 4 rw--- [ anon ]\n00007ffffffde000 132 12 12 rw--- [ stack ]\nffffffffff600000 4 0 0 --x-- [ anon ]\n---------------- ------- ------- ------- \ntotal kB 6148 3648 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diff --git a/assets/js/16.d264cc33.js b/assets/js/16.d264cc33.js
new file mode 100644
index 0000000..49ef1d0
--- /dev/null
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+(window.webpackJsonp=window.webpackJsonp||[]).push([[23],{603:function(v,_,p){"use strict";p.r(_);var e=p(15),t=Object(e.a)({},(function(){var v=this,_=v.$createElement,p=v._self._c||_;return p("ContentSlotsDistributor",{attrs:{"slot-key":v.$parent.slotKey}},[p("p",[v._v("22020年09月18日星期五16:52:45 CST")]),v._v(" "),p("p",[v._v("1、做个简单的自我介绍")]),v._v(" "),p("p",[v._v("2.这个项目都是多少个人做的?")]),v._v(" "),p("p",[v._v("3.后端就你一个人做的吗?")]),v._v(" "),p("p",[v._v("4.项目做了多久?")]),v._v(" "),p("p",[v._v("5.说一说项目中困扰你时间比较长的问题?")]),v._v(" "),p("p",[v._v("6.项目中你试花在搭建环境的时间比较长是吗?(我说了很多关于服务器代码是如何实现的,原理是什么)")]),v._v(" "),p("p",[v._v("7.用了2个nginx具体是如何做高可用的")]),v._v(" "),p("p",[v._v("8.2个nginx都是回同时使用的吗?还是只是使用其中一个")]),v._v(" "),p("p",[v._v("9.用的2个ip给前端使用是吗?部署在不同的机器上面吗?")]),v._v(" "),p("p",[v._v("10.有了解过，用一个ip可以使多个nginx相互切换，例如其中一个nginx异常，是要访问另外一个ip是吗")]),v._v(" "),p("p",[v._v("11.有了解过虚拟ip这个东西呢?")]),v._v(" "),p("p",[v._v("12.nginx配置的是用什么样的负载均衡算法?")]),v._v(" "),p("p",[v._v("13.有了解过哪些负载均衡算法呢?")]),v._v(" "),p("p",[v._v("14.知道nginx是如何做负载均衡的吗?(我提到nginx中的线程池和epoll )")]),v._v(" "),p("p",[v._v("15.服务器是如何在多个副本中进行数据同步的?")]),v._v(" "),p("p",[v._v("16.知道原理细节吗?")]),v._v(" "),p("p",[v._v("17.现在的部署下，在什么故障下,服务器能够正常使用?")]),v._v(" "),p("p",[v._v("18.只实现了读的高可用,写方面没有实现高可用是吗?")]),v._v(" "),p("p",[v._v("19.fastdfs在写数据上能不能也做高可用?")]),v._v(" "),p("p",[v._v("20.有没有了解过其他分布式存储的东西呢?（我说对网络编程，tcp,网络的原理会熟悉一些)")]),v._v(" "),p("p",[v._v("21.什么情况下做东西线程通信?")]),v._v(" "),p("p",[v._v("22.单线程非阻塞有什么问题吗?")]),v._v(" "),p("p",[v._v("23.让你设计一个网络工具，你会用多线程同步阻塞的方式吗?")]),v._v(" "),p("p",[v._v("24.说一下你对epoll的了解?")]),v._v(" "),p("p",[v._v("25.说一下select的区别?")]),v._v(" "),p("p",[v._v("26.什么情况下适合用select,什么情况下适合使用epoll ?")]),v._v(" "),p("p",[v._v("27.为什么1024个连接的时候适合用select ?")]),v._v(" "),p("p",[v._v("28.为什么你认为select适合做1024个以下的连接?")]),v._v(" "),p("p",[v._v("29.平时select和 epoll都有写过吗?(我提到reactor)")]),v._v(" "),p("p",[v._v("30.说一下reactor和preactor的区别?")]),v._v(" "),p("p",[v._v("31.先说一下select是不是reactor ?")]),v._v(" "),p("p",[v._v("32.你是说epoll是同步的方式，reactor是异步的方式吗?")]),v._v(" "),p("p",[v._v("33.reactor这个概念你是从哪里了解到的?")]),v._v(" "),p("p",[v._v("34.一般搜索东西是在哪里搜索?")]),v._v(" "),p("p",[v._v("35.直接上csdn上面搜索吗?")]),v._v(" "),p("p",[v._v("36.为什么不直接用google搜索吗?是因为csdn上面搜索的东西比较适合你看吗?")]),v._v(" "),p("p",[v._v("37.你用epoll是来实现个什么东西?是应用还是练习?")]),v._v(" "),p("p",[v._v("38.关于epoll中处理数据的时候,你是如何处理的?")]),v._v(" "),p("p",[v._v("39.epoll的边沿触发和水平触发了解吗?")]),v._v(" "),p("p",[v._v("40.在使用上你是如何用边沿触发还是水平触发的?")]),v._v(" "),p("p",[v._v("41.如何设置边沿触发和水平触发的?")]),v._v(" "),p("p",[v._v("42.数据处理上是如何设计的?")]),v._v(" "),p("p",[v._v("43.以前有写过聊天室之类的通信呢?协议是如何设计的?")]),v._v(" "),p("p",[v._v("44.聊天室是你大学的时候做的吗?")]),v._v(" "),p("p",[v._v("45.你写socket变成的话，你试如何处理这些接口的错误的?")]),v._v(" "),p("p",[v._v("46.recv返回-1的话就是错误吗?")]),v._v(" "),p("p",[v._v("47.工作中为什么要用redis做这个token呢?")]),v._v(" "),p("p",[v._v("48.redis有了解过是如何做持久化的呢?")]),v._v(" "),p("p",[v._v("49.redis数据结构有了解哪些呢?")]),v._v(" "),p("p",[v._v("50.有序的set是如何实现的?")]),v._v(" "),p("p",[v._v("51.在这个公司还有别的工作体现你的水平的东西吗?")]),v._v(" "),p("p",[v._v("52.看你有用mmap,说一下mmap是什么?")]),v._v(" "),p("p",[v._v("53.你觉得哪些场景可以用mmap ?(我说了开发板的屏幕映射）")]),v._v(" "),p("p",[v._v("54.做软件开发的时候什么时候会用到mmap ?（我说了netmap用户态协议栈)")]),v._v(" "),p("p",[v._v("55.共享内存有了解过吗? 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diff --git a/assets/js/25.3423b9d6.js b/assets/js/25.3423b9d6.js
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