前面介绍到了3个应用的安装，接下来是对其中一个应用做压力测试，后用xcache提供php加速功能,再来测试一下性能提升了多少，而后把mysql分离出来，做压测看能否提升性能。
1.对wordpress做压力测试
[root@smallpc ~]# ab -c 100 -n 1000 http://192.168.20.163/wordpress/index.php
This is ApacheBench, Version 2.3 <$Revision: 655654 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/ Benchmarking 192.168.20.163 (be patient) apr_poll: The timeout specified has expired (70007) Total of 18 requests completed 由于是虚拟机，这里只完成了18个请求查看服务器状态页面时，显示
此时终端都卡住了，页面也访问不了
[root@localhost wordpress]# free -m
total used free shared buffers cached Mem: 482 467 15 0 0 12 -/+ buffers/cache: 454 28 Swap: 1535 1014 521 内存占满了[root@smallpc ~]# ab -c 80 -n 500 http://192.168.20.163/wordpress/index.php
This is ApacheBench, Version 2.3 <$Revision: 655654 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/ Benchmarking 192.168.20.163 (be patient) apr_poll: The timeout specified has expired (70007)虚拟机都挂了，看了要换实体机来实验了，先凑合着用
登录项没有任何反应，重启虚拟机，发现虚拟机只有512M的内存，给其2G内存，再来实验
[root@localhost ~]# ss -tnl
State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 :::22 :::* LISTEN 0 128 *:22 *:* LISTEN 0 100 ::1:25 :::* LISTEN 0 100 127.0.0.1:25 *:* LISTEN 0 50 *:3306 *:* LISTEN 0 128 :::8080 :::* LISTEN 0 128 :::80 :::* [root@localhost ~]# ps aux | grep httpd root 5553 0.1 0.5 256772 9652 ? Ss 01:50 0:00 /usr/sbin/httpd apache 5602 0.0 0.2 256772 5516 ? S 01:50 0:00 /usr/sbin/httpd apache 5603 0.0 0.2 256772 5512 ? S 01:50 0:00 /usr/sbin/httpd apache 5604 0.0 0.2 256772 5512 ? S 01:50 0:00 /usr/sbin/httpd apache 5605 0.0 0.2 256772 5512 ? S 01:50 0:00 /usr/sbin/httpd apache 5606 0.0 0.2 256772 5512 ? S 01:50 0:00 /usr/sbin/httpd apache 5607 0.0 0.2 256772 5512 ? S 01:50 0:00 /usr/sbin/httpd apache 5608 0.0 0.2 256772 5512 ? S 01:50 0:00 /usr/sbin/httpd apache 5609 0.0 0.2 256772 5512 ? S 01:50 0:00 /usr/sbin/httpd root 5635 0.0 0.0 103252 840 pts/0 S+ 01:51 0:00 grep httpd此时是prefork模型工作，修改一下配置文件
<IfModule prefork.c>
StartServers 8 改为 15 MinSpareServers 5 MaxSpareServers 20 改为45 ServerLimit 256 MaxClients 256 MaxRequestsPerChild 4000 </IfModule>[root@localhost ~]# service httpd reload
Reloading httpd:[root@hostpc ~]# ulimit -n 5000
发起压力测试：
[root@hostpc ~]# ab -c 100 -n 1000 http://192.168.20.163/wordpress/index.php
This is ApacheBench, Version 2.3 <$Revision: 655654 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/ Benchmarking 192.168.20.163 (be patient) apr_poll: The timeout specified has expired (70007) Total of 30 requests completed服务器挂了，只能等待了
其中载录了一种状态
都是一些等待连接
交换内存已经使用了234M了
此时只有等 等待连接处理完才能，内存才会降下来
[root@localhost ~]# top
top - 03:41:17 up 1:51, 3 users, load average: 0.00, 0.09, 1.35 Tasks: 167 total, 1 running, 166 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1914428k total, 1240172k used, 674256k free, 20808k buffers Swap: 1572860k total, 43992k used, 1528868k free, 199596k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 5769 apache 20 0 272m 26m 4440 S 0.0 1.4 0:03.30 httpd 6249 apache 20 0 364m 25m 4860 S 0.0 1.4 0:01.43 httpd 5930 apache 20 0 364m 25m 4976 S 0.0 1.4 0:02.59 httpd 6247 apache 20 0 269m 25m 4792 S 0.0 1.4 0:01.25 httpd 5879 apache 20 0 364m 25m 4928 S 0.0 1.4 0:02.20 httpd 5892 apache 20 0 364m 25m 4924 S 0.0 1.3 0:02.33 httpd 5924 apache 20 0 364m 25m 4936 S 0.0 1.3 0:03.16 httpd 5888 apache 20 0 364m 25m 4888 S 0.0 1.3 0:02.49 httpd 5808 apache 20 0 364m 25m 4892 S 0.0 1.3 0:02.62 httpd 5820 apache 20 0 269m 25m 4780 S 0.0 1.3 0:02.51 httpd 5839 apache 20 0 269m 25m 4780 S 0.0 1.3 0:02.51 httpd 5868 apache 20 0 269m 25m 4780 S 0.0 1.3 0:02.03 httpd 5827 apache 20 0 269m 25m 4780 S 0.0 1.3 0:02.42 httpd 5777 apache 20 0 364m 25m 4740 S 0.0 1.3 0:02.70 httpd 5823 apache 20 0 269m 25m 4780 S 0.0 1.3 0:02.50 httpd 5899 apache 20 0 364m 24m 4668 S 0.0 1.3 0:02.35 httpd 现在可以发现cpu负载都很小了，只有一个处于运行状态，166个进程都是睡眠状态，因为刚才发了好几个并发请求，cpu是有记忆功能的，这种状态会保持一段时间，httpd启动的进程数也为最大空闲进程数。[root@localhost wordpress]# free -m
total used free shared buffers cached Mem: 1869 1244 624 0 22 217 -/+ buffers/cache: 1004 865 Swap: 1535 42 1493 [root@localhost wordpress]# echo 1 > /proc/sys/vm/drop_caches 清空缓存 [root@localhost wordpress]# free -m total used free shared buffers cached Mem: 1869 1016 853 0 0 14 -/+ buffers/cache: 1001 868 这是空闲的内存变大了，cached和buffers都变小了 Swap: 1535 42 1493[root@hostpc ~]# ab -c 20 -n 500 http://192.168.20.163/wordpress/index.php
This is ApacheBench, Version 2.3 <$Revision: 655654 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/ Benchmarking 192.168.20.163 (be patient) Completed 100 requests Completed 200 requests Completed 300 requests Completed 400 requests Completed 500 requests Finished 500 requests Server Software: Apache Server Hostname: 192.168.20.163 Server Port: 80 Document Path: /wordpress/index.php Document Length: 0 bytes Concurrency Level: 20 Time taken for tests: 124.706 seconds Complete requests: 500 Failed requests: 0 Write errors: 0 Non-2xx responses: 500 Total transferred: 155000 bytes HTML transferred: 0 bytes Requests per second: 4.01 [#/sec] (mean) Time per request: 4988.240 [ms] (mean) Time per request: 249.412 [ms] (mean, across all concurrent requests) Transfer rate: 1.21 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 35 181.4 1 1002 Processing: 1058 4936 2553.0 3931 14696 Waiting: 1058 4919 2551.4 3920 14695 Total: 1059 4971 2549.4 3933 14697 Percentage of the requests served within a certain time (ms) 50% 3933 66% 4296 75% 5303 80% 6077 90% 8435 95% 11511 98% 13257 99% 14583 100% 14697 (longest request)安装xcache
#yum install -y php-xcache
查看安装生成了哪些文件
#rpm -ql php-xcache
重启一下httpd
[root@localhost ~]# service httpd restart
Stopping httpd: [ OK ] Starting httpd: httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain for ServerName [root@localhost ~]# ps aux | grep httpd root 9418 2.8 0.5 324584 10080 ? Ss 07:04 0:01 /usr/sbin/httpd apache 9421 0.2 0.3 324944 6528 ? S 07:04 0:00 /usr/sbin/httpd apache 9422 0.1 0.3 324944 6528 ? S 07:04 0:00 /usr/sbin/httpd apache 9423 0.1 0.2 324584 5592 ? S 07:04 0:00 /usr/sbin/httpd apache 9424 0.0 0.2 324584 5588 ? S 07:04 0:00 /usr/sbin/httpd apache 9425 0.0 0.2 324584 5588 ? S 07:04 0:00 /usr/sbin/httpd apache 9426 0.0 0.2 324584 5588 ? S 07:04 0:00 /usr/sbin/httpd apache 9427 0.0 0.2 324584 5588 ? S 07:04 0:00 /usr/sbin/httpd apache 9428 0.0 0.2 324584 5588 ? S 07:04 0:00 /usr/sbin/httpd apache 9429 0.0 0.2 324584 5588 ? S 07:04 0:00 /usr/sbin/httpd apache 9430 0.0 0.2 324584 5588 ? S 07:04 0:00 /usr/sbin/httpd apache 9431 0.0 0.2 324584 5588 ? S 07:04 0:00 /usr/sbin/httpd apache 9432 0.0 0.2 324584 5588 ? S 07:04 0:00 /usr/sbin/httpd apache 9433 0.0 0.2 324584 5588 ? S 07:04 0:00 /usr/sbin/httpd apache 9434 0.0 0.2 324584 5588 ? S 07:04 0:00 /usr/sbin/httpd apache 9435 0.0 0.2 324584 5588 ? S 07:04 0:00 /usr/sbin/httpd root 9437 0.0 0.0 103252 828 pts/2 S+ 07:05 0:00 grep httpd [root@localhost ~]# free -m total used free shared buffers cached Mem: 1869 243 1625 0 5 101 -/+ buffers/cache: 136 1732 这是空闲内存已经有好多了 Swap: 1535 22 1513 再发起一次压测[root@hostpc ~]# ab -c 20 -n 500 http://192.168.20.163/wordpress/index.php
This is ApacheBench, Version 2.3 <$Revision: 655654 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/ Benchmarking 192.168.20.163 (be patient) Completed 100 requests Completed 200 requests Completed 300 requests Completed 400 requests Completed 500 requests Finished 500 requests Server Software: Apache Server Hostname: 192.168.20.163 Server Port: 80 Document Path: /wordpress/index.php Document Length: 0 bytes Concurrency Level: 20 Time taken for tests: 109.287 seconds Complete requests: 500 Failed requests: 0 Write errors: 0 Non-2xx responses: 500 Total transferred: 155000 bytes HTML transferred: 0 bytes Requests per second: 4.58 [#/sec] (mean) Time per request: 4371.464 [ms] (mean) Time per request: 218.573 [ms] (mean, across all concurrent requests) Transfer rate: 1.39 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 2 1.7 1 19 Processing: 232 4215 4474.5 4897 20757 Waiting: 232 4203 4472.0 4892 20757 Total: 234 4217 4474.7 4898 20758 Percentage of the requests served within a certain time (ms) 50% 4898 66% 5518 75% 5645 80% 5751 90% 10529 95% 11134 98% 20599 99% 20640 100% 20758 (longest request) [ OK ]可以发现性能也没提升多少，因为本身是虚拟机而且内存又不大，所以性能提升也不明显
把MySQL分离出去，就是要请求数据时需要远程来请求访问，需要提供用户远程MySQL服务器来登录获取数据，此处就不演示了，因为前面应用中也有指定过mysql的位置，只要把MySQL改为远程提供服务，且授权到用户使用指定的数据库即可。