我的 centos 6.7 服务器只有基于 php 和 mysql 的低流量网站（所有网站每天的总页面浏览量约为 3000 次），使用 nginx 网络服务器和 virtualmin（没有 wordpress 或外部脚本/软件）。
我使用以下命令安装 PHP：
yum --enablerepo=remi,remi-php56 install -y php-mysqlnd php-gd php-fpm
yum 安装了依赖项，例如 php-commom、php-pdo 等。
我使用 virtualmin 检查了服务器中正在运行的进程。
重新启动 php-fpm 后，每个 php-fpm：pool www进程正在使用400MB记忆。
etc/php.d 目录中有 20 多个扩展。
我注释了 etc/php.d 目录中的大部分扩展。
重新启动 php-fpm 和 nginx 后，
我使用以下方法检查了已安装的扩展
<?php
print_r(get_loaded_extensions());
?>
结果如下：
[0] => Core
[1] => date
[2] => ereg
[3] => libxml
[4] => openssl
[5] => pcre
[6] => zlib
[7] => filter
[8] => hash
[9] => Reflection
[10] => SPL
[11] => session
[12] => standard
[13] => cgi-fcgi
[14] => curl
[15] => ftp
[16] => gd
[17] => mysqlnd
[18] => PDO
[19] => mysql
[20] => pdo_mysql
[21] => json
[22] => mhash
现在重新启动 php-fpm 后，每个 php-fpm：池 www进程正在使用250MB记忆 。
www.conf :
pm = dynamic
pm.max_children = 50
pm.start_servers = 5
pm.min_spare_servers = 5
pm.max_spare_servers = 35
在 php.ini 中
memory_limit = 128M
在 virtualmin 中运行进程：
Real memory: 31.19 GB total / 21.17 GB free / 20.24 GB cached Swap space: 1024 MB total / 341.19 MB free
ID Owner Size Command
46929 mysql 10.48 GB /usr/sbin/mysqld --basedir=/usr --datadir=/home/mysql-data --plugin-dir=/var/lib ...
45061 dkim-milter 1.96 GB /usr/sbin/dkim-filter -x /etc/mail/dkim-milter/dkim-filter.conf -P /var/run/dkim ...
27380 sphinx 1.19 GB /usr/bin/searchd --config /etc/sphinx/sphinx.conf
45056 named 709.38 MB /usr/sbin/named -u named
56055 apache 614.07 MB php-fpm: pool www
25919 apache 317.67 MB php-fpm: pool www
19624 apache 305.90 MB php-fpm: pool www
16654 apache 300.36 MB php-fpm: pool www
24973 apache 295.33 MB php-fpm: pool www
24559 apache 291.47 MB php-fpm: pool www
30654 apache 285.20 MB php-fpm: pool www
50347 apache 285.09 MB php-fpm: pool www
19531 apache 254.57 MB php-fpm: pool www
33874 apache 254.42 MB php-fpm: pool www
15467 apache 253.65 MB php-fpm: pool www
42002 apache 253.01 MB php-fpm: pool www
40159 apache 251.92 MB php-fpm: pool www
48884 apache 251.05 MB php-fpm: pool www
1568 root 250.19 MB /sbin/rsyslogd -i /var/run/syslogd.pid -c 5
7628 apache 249.05 MB php-fpm: pool www
52524 apache 247.92 MB php-fpm: pool www
897 apache 247.14 MB php-fpm: pool www
19972 apache 246.92 MB php-fpm: pool www
44322 apache 246.64 MB php-fpm: pool www
56975 apache 246.50 MB php-fpm: pool www
28549 apache 246.42 MB php-fpm: pool www
25728 apache 246.09 MB php-fpm: pool www
65048 root 245.55 MB php-fpm: master process (/etc/php-fpm.conf)
46044 root 105.76 MB /bin/sh /usr/bin/mysqld_safe --datadir=/home/mysql-data --socket=/var/lib/mysql/ ...
43584 root 98.25 MB /usr/libexec/webmin/proc/index_size.cgi
59312 root 97.63 MB sshd: root@notty
27379 sphinx 90.30 MB /usr/bin/searchd --config /etc/sphinx/sphinx.conf
15861 root 86.25 MB /usr/bin/perl /usr/libexec/webmin/miniserv.pl /etc/webmin/miniserv.conf
43585 root 86.25 MB /usr/bin/perl /usr/libexec/webmin/miniserv.pl /etc/webmin/miniserv.conf
43589 root 86.25 MB /usr/bin/perl /usr/libexec/webmin/miniserv.pl /etc/webmin/miniserv.conf
35690 postfix 79.22 MB qmgr -l -t fifo -u
2723 postfix 79.05 MB pickup -l -t fifo -u
39868 root 78.97 MB /usr/libexec/postfix/master
24373 root 64.85 MB /usr/sbin/saslauthd -m /var/run/saslauthd -a pam -r
24374 root 64.85 MB /usr/sbin/saslauthd -m /var/run/saslauthd -a pam -r
24375 root 64.85 MB /usr/sbin/saslauthd -m /var/run/saslauthd -a pam -r
24376 root 64.85 MB /usr/sbin/saslauthd -m /var/run/saslauthd -a pam -r
24377 root 64.85 MB /usr/sbin/saslauthd -m /var/run/saslauthd -a pam -r
10485 root 64.67 MB /usr/sbin/sshd
59383 root 56.03 MB /usr/libexec/openssh/sftp-server
42540 nginx 54.42 MB nginx: worker process
42545 nginx 54.19 MB nginx: worker process
42539 nginx 53.52 MB nginx: worker process
42542 nginx 53.52 MB nginx: worker process
42543 nginx 53.36 MB nginx: worker process
42538 nginx 53.32 MB nginx: worker process
42546 nginx 53.32 MB nginx: worker process
42544 nginx 53.23 MB nginx: worker process
42537 root 49.33 MB nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf
最佳结果：按内存使用情况排序：
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
46929 mysql 20 0 10.5g 5.3g 4992 S 1.0 17.0 369:43.82 mysqld
27380 sphinx 20 0 1218m 463m 433m S 6.0 1.5 266:34.64 searchd
56055 apache 20 0 614m 373m 3964 S 2.3 1.2 5:09.57 php-fpm
25919 apache 20 0 323m 84m 5260 S 4.0 0.3 3:32.51 php-fpm
19624 apache 20 0 306m 66m 5048 S 4.6 0.2 7:02.03 php-fpm
16654 apache 20 0 300m 60m 4288 S 0.3 0.2 0:49.27 php-fpm
24973 apache 20 0 295m 54m 3944 S 0.7 0.2 1:18.91 php-fpm
45056 named 20 0 709m 51m 2500 S 0.7 0.2 21:01.48 named
24559 apache 20 0 291m 51m 4988 S 0.0 0.2 1:08.85 php-fpm
50347 apache 20 0 286m 46m 4964 S 1.3 0.1 0:40.13 php-fpm
30654 apache 20 0 285m 34m 7400 S 0.7 0.1 2:09.37 php-fpm
15861 root 20 0 88320 17m 1888 S 0.0 0.1 0:10.77 miniserv.pl
15467 apache 20 0 253m 15m 5428 S 0.0 0.0 0:28.92 php-fpm
42002 apache 20 0 253m 14m 5036 S 0.0 0.0 0:01.19 php-fpm
33874 apache 20 0 254m 14m 4012 S 0.0 0.0 1:48.74 php-fpm
42540 nginx 20 0 55724 12m 1052 S 0.0 0.0 0:11.45 nginx
42545 nginx 20 0 55492 12m 1052 S 0.0 0.0 0:12.47 nginx
40159 apache 20 0 251m 12m 4036 S 0.0 0.0 0:01.16 php-fpm
42539 nginx 20 0 54804 11m 1056 S 0.0 0.0 0:11.76 nginx
42542 nginx 20 0 54804 11m 1052 S 0.0 0.0 0:12.55 nginx
42543 nginx 20 0 54636 11m 1052 S 0.0 0.0 0:12.48 nginx
42544 nginx 20 0 54508 11m 1056 S 0.0 0.0 0:11.07 nginx
42546 nginx 20 0 54604 11m 1052 S 0.0 0.0 0:12.52 nginx
42538 nginx 20 0 54604 11m 1052 S 0.0 0.0 0:13.75 nginx
48884 apache 20 0 251m 11m 3996 S 0.0 0.0 0:01.19 php-fpm
52524 apache 20 0 247m 9800 3452 S 0.0 0.0 0:01.17 php-fpm
7628 apache 20 0 249m 9296 3964 S 0.0 0.0 0:00.92 php-fpm
897 apache 20 0 247m 8824 3460 S 0.0 0.0 0:01.07 php-fpm
19972 apache 20 0 246m 8300 3472 S 0.0 0.0 0:00.79 php-fpm
25728 apache 20 0 246m 7680 3436 S 0.0 0.0 0:00.38 php-fpm
28549 apache 20 0 246m 7404 3056 S 0.0 0.0 0:00.31 php-fpm
44322 apache 20 0 246m 7300 3088 S 0.0 0.0 0:00.65 php-fpm
56975 apache 20 0 246m 7220 3116 S 0.0 0.0 0:00.51 php-fpm
17463 apache 20 0 246m 7208 2968 S 0.0 0.0 0:00.05 php-fpm
42537 root 20 0 50516 6936 296 S 0.0 0.0 0:00.00 nginx
1568 root 20 0 250m 6264 868 S 0.0 0.0 0:34.28 rsyslogd
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谢谢。