什么是的httpd＆LT;＆倒闭GT ;? [英] What is httpd <defunct>?

问题描述

  32537阿帕奇16 0 8742415米7324 2.3英里0.3 0：00.52的httpd
 3302 mysql的15 0156米41米4756小号1.3 0.7 10：50.91的mysqld
  489 apache的16 0 8701614米6692小号0.7 0.2 0：00.27的httpd
  990 apache的15 0 0 0 0ž0.7 0.0 0：00.12的httpd＆LT;＆倒闭GT;
  665 apache的15 0 8699213米5644小号0.3 0.2 0：00.20的httpd
32218阿帕奇15 0 8735614米6344小号0.3 0.2 0：00.53的httpd
    1根15 0 2160 640 556秒0.0 0.0 0：01.18 INIT
 

从顶，还有偶尔的的httpd＆LT;＆倒闭GT; 显示出来。它有什么作用？

我发现Web服务器有时不会（在用户的要求印刷PDF）响应 FPDF 。这是否与？

更新，与负载信息：

 顶 -  11时55分59秒了17:30 6用户，平均负载：0.53，0.47，0.80
任务：322总，运行1，320睡觉，0停止，1僵尸
CPU（S）：0.7％，美国0.2％SY，0.0％的镍，95.1％的id，3.9％WA，0.0％喜，0.1％的硅，0.0％ST
纪念品：6219412k总，5944068k使用，275344k自由，21024k缓冲区
交换：5140792k总共使用96K，5140696k免费，5270708k缓存  PID USER PR NI VIRT RES SHR S％CPU％MEM TIME + COMMAND
 1951年16阿帕奇0 0 0 0ž0.9 0.0 0：00.3​​3的httpd＆LT;＆倒闭GT;
 2267阿帕奇15 0 8699213米5876小号0.9 0.2 0：00.22的httpd
 3302 mysql的15 0156米41米4756小号0.9 0.7 11：43.72的mysqld
 2220阿帕奇15 0 8720414米6496小号0.6 0.2 0：00.28的httpd
 2340阿帕奇15 0 8782813米5588小号0.6 0.2 0：00.22的httpd
 2341阿帕奇17 0 8823614米5564小号0.6 0.2 0：00.15的httpd
  842 apache的16 0 8743215米7180小号0.3 0.2 0：00.81的httpd
 2225阿帕奇18 0 8823614米5560小号0.3 0.2 0：00.17的httpd
 2401阿帕奇15 0 8691612米5344小号0.3 0.2 0：00.11的httpd
    1根24 0 2160 640 556秒0.0 0.0 0：01.18 INIT
 

解决方案

一个倒闭的进程已退出的过程，但其母公司尚未等着它来阅读它的退出状态，留在进程表中的条目。也称为僵尸进程。请参见维基百科的文章更多信息。

32537 apache    16   0 87424  15m 7324 S  2.3  0.3   0:00.52 httpd              
 3302 mysql     15   0  156m  41m 4756 S  1.3  0.7  10:50.91 mysqld             
  489 apache    16   0 87016  14m 6692 S  0.7  0.2   0:00.27 httpd              
  990 apache    15   0     0    0    0 Z  0.7  0.0   0:00.12 httpd <defunct>    
  665 apache    15   0 86992  13m 5644 S  0.3  0.2   0:00.20 httpd              
32218 apache    15   0 87356  14m 6344 S  0.3  0.2   0:00.53 httpd              
    1 root      15   0  2160  640  556 S  0.0  0.0   0:01.18 init  

From top, there is an occasional httpd <defunct> showing up. What does it do?

I found that the web server sometimes does not response to FPDF (print PDF at user's request). Is it related?

UPDATE, with loading information:

top - 11:55:59 up 17:30,  6 users,  load average: 0.53, 0.47, 0.80
Tasks: 322 total,   1 running, 320 sleeping,   0 stopped,   1 zombie
Cpu(s):  0.7%us,  0.2%sy,  0.0%ni, 95.1%id,  3.9%wa,  0.0%hi,  0.1%si,  0.0%st
Mem:   6219412k total,  5944068k used,   275344k free,    21024k buffers
Swap:  5140792k total,       96k used,  5140696k free,  5270708k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND           
 1951 apache    16   0     0    0    0 Z  0.9  0.0   0:00.33 httpd <defunct>    
 2267 apache    15   0 86992  13m 5876 S  0.9  0.2   0:00.22 httpd              
 3302 mysql     15   0  156m  41m 4756 S  0.9  0.7  11:43.72 mysqld             
 2220 apache    15   0 87204  14m 6496 S  0.6  0.2   0:00.28 httpd              
 2340 apache    15   0 87828  13m 5588 S  0.6  0.2   0:00.22 httpd              
 2341 apache    17   0 88236  14m 5564 S  0.6  0.2   0:00.15 httpd              
  842 apache    16   0 87432  15m 7180 S  0.3  0.2   0:00.81 httpd              
 2225 apache    18   0 88236  14m 5560 S  0.3  0.2   0:00.17 httpd              
 2401 apache    15   0 86916  12m 5344 S  0.3  0.2   0:00.11 httpd              
    1 root      24   0  2160  640  556 S  0.0  0.0   0:01.18 init               

解决方案

A defunct process is a process that has exited but whose parent has not yet waited on it to read its exit status, leaving an entry in the process table. Also known as a zombie process. See the Wikipedia article for more information.

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