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电梯直达

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发表于 2009-09-12 10:29 |只看该作者 |倒序浏览

先说下系统情况：
我们服务器是
centos es4.0
mem:4G
Generic :1024 MB
Generic :1024 MB
Generic :1024 MB
Generic :1024 MB
Dell :1066/1333FSB Dual Xeon
Dell: 9G Drive Controller - SAS/SATA - budget raid
Intel :2.0 GHz 1333FSB - Harpertown
Intel :2.0 GHz 1333FSB - Harpertown
Dell :6 Drive Max
上面有购物网站，数据库，邮件服务器
//====================由于主机是由WHM管理。有些默认配置。如下是我我做了调整的设置参数
【mysqld】
set-variable = max_connections=500
set-variable = log-slow-queries=/var/lib/sly/slowquery.log
set-variable = long_query_time=2
set-variable = key_buffer_size=384M
set-variable = max_allowed_packet=1M
set-variable = table_cache=512
set-variable = sort_buffer_size=2M
set-variable = read_buffer_size=2097144
set-variable = read_rnd_buffer_size=8388608
set-variable = myisam_sort_buffer_size=67108864
set-variable = thread_cache_size=16
set-variable = query_cache_size=33554432
safe-show-database
//=========================
【httpd.conf】
# RLimitMEM 469736789
RLimitMEM 1258291200
# RLimitCPU 240
RLimitCPU 480

Timeout 5
KeepAlive On
MaxKeepAliveRequests 200
KeepAliveTimeout 8

<IfModule mpm_prefork_module>
# StartServers       5
# MinSpareServers    5
# MaxSpareServers    10
# MaxClients       150
# MaxRequestsPerChild 0

   ServerLimit          2500
   StartServers       20
   MinSpareServers    20
   MaxSpareServers    25
   MaxClients          600
   MaxRequestsPerChild 2000
</IfModule>
//==========================end

？？？？？？？？？？？？？？？？？？？？？？？？
当前状态：
top - 09:20:01 up 7 days, 23:21,  1 user,  load average: 104.94, 103.26, 99.13
Tasks: 387 total,  46 running, 340 sleeping, 0 stopped, 1 zombie
Cpu(s): 66.0% us, 33.5% sy,  0.0% ni,  0.5% id,  0.0% wa,  0.0% hi,  0.0% si
Mem: 4144624k total,  3488524k used, 656100k free, 302508k buffers
Swap:  2040212k total, 12672k used,  2027540k free,  1610276k cached

  PID USER    PR  NI  VIRT  RES  SHR S %CPU %MEM TIME+  COMMAND
24175 mysql    16 0  627m 177m 5232 S 431.0  4.4 8655:43 mysqld
11355 nobody 16 0 32644  18m 4580 R  4.9  0.4 7:12.00 httpd
6600 nobody 15 0 32396  18m 4576 S  4.6  0.4  56:02.25 httpd
3796 nobody 16 0 32612  18m 4556 R  4.3  0.4  62:11.61 httpd
4667 nobody 15 0 32316  17m 4444 S  4.3  0.4 9:09.37 httpd
8156 nobody 16 0 32384  18m 4932 R  4.3  0.5 0:30.77 httpd
9179 nobody 15 0 32848  18m 4632 S  4.3  0.5 3:08.57 httpd
10536 nobody 15 0 32604  18m 4504 S  4.3  0.4 0:21.10 httpd
13338 nobody 15 0 32628  18m 4876 S  4.3  0.5  13:51.90 httpd
15822 nobody 15 0 32316  17m 4508 R  4.3  0.4  25:30.17 httpd
16230 nobody 15 0 32668  18m 4580 S  4.3  0.5 2:19.58 httpd
17585 nobody 16 0 32624  18m 4564 R  4.3  0.5  13:05.02 httpd
26828 nobody 16 0 32836  18m 4444 R  4.3  0.4 5:20.20 httpd
2637 nobody 15 0 32712  18m 5004 S  3.9  0.5  16:04.37 httpd
。。。。。。。。。。。。。。。
[~]#netstat -an | grep -c :80
229
[~]#ps -ef | grep httpd | wc -l
147
[~]#vmstat
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r  b swpd free buff  cache si so bi bo in cs us sy id wa
5  0  12672 549084 302776 1630548 0 0 23 92 3    7 63 29  8  0
===============

疑惑1：这个TOP命令列出来的HTTPD进程，"TIME+"(怎么能累计耗cpu) 62:11.61 这么久啊? 正常吗？
   我不是已经在httpd那边设置了做完一些事情后，关闭断开吗？怎么都好像没断过，怎么理解这个时间。
疑惑2：按我的查看，同时在线的IP少的可怜，一分钟内就四五个算多的了。 (站长统计参考),系统资源就这样，怎么谈搞访问啊？
现象1：一重启apache，HTTPD全部被关闭了，mysql cpu立即降下来了20%左右。  目前一天看情况一般要手动重启两次apache

//=========请大家帮我分析分析，给小弟点帮助和指导。先谢谢啦