最近我一直有一些问题与PHP-FPM，我注意到，IO是非常高的所有PHP-FMI（99.9％），这是什么导致CPU负荷秒杀。
顶部命令
top - 06:28:53 up 8 days, 21:05, 2 users, load average: 179.61, 82.23, 70.63 Tasks: 913 total, 11 running, 901 sleeping, 0 stopped, 1 zombie Cpu(s): 9.7%us, 1.7%sy, 0.0%ni, 31.4%id, 56.0%wa, 0.0%hi, 1.1%si, 0.0%st Mem: 16296824k total, 9676012k used, 6620812k free, 242004k buffers Swap: 8159228k total, 16k used, 8159212k free, 6596628k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 50283 nginx 20 0 439m 11m 6108 S 22.8 0.1 0:01.10 php-fpm 37536 nginx 20 0 440m 12m 6432 S 5.9 0.1 0:05.32 php-fpm 44007 nginx 20 0 439m 12m 6428 D 5.9 0.1 0:02.50 php-fpm 47827 nginx 20 0 442m 13m 6320 R 5.6 0.1 0:01.28 php-fpm 49263 nginx 20 0 439m 11m 6176 S 5.3 0.1 0:00.53 php-fpm 40709 nginx 20 0 440m 12m 6400 S 5.0 0.1 0:03.34 php-fpm 42967 nginx 20 0 439m 12m 6324 S 5.0 0.1 0:02.43 php-fpm 48703 nginx 20 0 439m 11m 5992 S 4.6 0.1 0:00.56 php-fpm 21532 nginx 20 0 121m 19m 2936 S 4.0 0.1 0:59.10 nginx 50684 nginx 20 0 439m 12m 6184 S 4.0 0.1 0:00.30 php-fpm 44081 nginx 20 0 439m 11m 6284 S 3.6 0.1 0:02.29 php-fpm 48760 nginx 20 0 440m 12m 6372 S 3.6 0.1 0:01.34 php-fpm 38657 nginx 20 0 440m 12m 6848 D 3.3 0.1 0:03.48 php-fpm 49899 nginx 20 0 439m 11m 6040 S 3.3 0.1 0:00.63 php-fpm iotop命令
488 be/4 nginx 0.00 B/s 0.00 B/s 0.00 % 99.99 % php-fpm: pool www 47360 be/4 nginx 0.00 B/s 3.66 K/s 0.00 % 99.99 % php-fpm: pool www 51005 be/4 nginx 0.00 B/s 3.66 K/s 0.00 % 99.99 % php-fpm: pool www 56126 be/4 nginx 0.00 B/s 3.66 K/s 0.00 % 82.48 % php-fpm: pool www 48028 be/4 nginx 0.00 B/s 3.66 K/s 0.00 % 54.14 % php-fpm: pool www 54876 be/4 nginx 0.00 B/s 0.00 B/s 0.00 % 48.00 % php-fpm: pool www 47651 be/4 nginx 0.00 B/s 3.66 K/s 0.00 % 37.67 % php-fpm: pool www 839 be/4 root 0.00 B/s 0.00 B/s 0.00 % 37.30 % [kmirrord] 47811 be/4 nginx 0.00 B/s 7.31 K/s 0.00 % 36.73 % php-fpm: pool www 48014 be/4 nginx 0.00 B/s 3.66 K/s 0.00 % 35.81 % php-fpm: pool www 48050 be/4 nginx 0.00 B/s 0.00 B/s 0.00 % 34.42 % php-fpm: pool www 47987 be/4 nginx 0.00 B/s 3.66 K/s 0.00 % 32.06 % php-fpm: pool www 47468 be/4 nginx 0.00 B/s 3.66 K/s 0.00 % 27.39 % php-fpm: pool www
/etc/sysctl.conf设置
net.ipv4.ip_forward = 0 net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.default.accept_source_route = 0 kernel.sysrq = 0 kernel.core_uses_pid = 1 net.ipv4.tcp_synack_retries = 2 net.ipv4.conf.all.send_redirects = 0 net.ipv4.conf.default.send_redirects = 0 net.ipv4.conf.all.accept_source_route = 0 net.ipv4.conf.all.accept_redirects = 0 net.ipv4.conf.all.secure_redirects = 0 net.ipv4.conf.all.log_martians = 1 net.ipv4.conf.default.accept_source_route = 0 net.ipv4.conf.default.accept_redirects = 0 net.ipv4.conf.default.secure_redirects = 0 net.ipv4.icmp_echo_ignore_broadcasts = 1 net.ipv4.tcp_syncookies = 1 net.ipv4.conf.all.rp_filter = 1 net.ipv4.conf.default.rp_filter = 1 net.ipv6.conf.default.router_solicitations = 0 net.ipv6.conf.default.accept_ra_rtr_pref = 0 net.ipv6.conf.default.accept_ra_pinfo = 0 net.ipv6.conf.default.accept_ra_defrtr = 0 net.ipv6.conf.default.autoconf = 0 net.ipv6.conf.default.dad_transmits = 0 net.ipv6.conf.default.max_addresses = 1 kernel.exec-shield = 1 kernel.randomize_va_space = 1 fs.file-max = 65535 kernel.pid_max = 65536 net.ipv4.ip_local_port_range = 2000 65000
/etc/php-fpm.conf
include=/etc/php-fpm.d/*.conf [global] pid = /var/run/php-fpm/php-fpm.pid error_log = /var/log/php-fpm/error.log log_level = warning emergency_restart_threshold = 10 emergency_restart_interval = 1m process_control_timeout = 10 daemonize = yes
/etc/php.d/www.conf
[www] listen = /tmp/php5-fpm.sock listen.allowed_clients = 127.0.0.1 listen.mode = 0666 user = nginx group = nginx pm = static pm.max_children = 800 pm.start_servers = 225 pm.min_spare_servers = 150 pm.max_spare_servers = 800 pm.max_requests = 5000 request_terminate_timeout = 300 request_slowlog_timeout = 120s slowlog = /var/log/php-fpm/www-slow.log php_admin_value[error_log] = /var/log/php-fpm/www-error.log php_admin_flag[log_errors] = on php_value[session.save_handler] = files php_value[session.save_path] = /var/lib/php/session php_value[soap.wsdl_cache_dir] = /var/lib/php/wsdlcache
为了解决这个问题，我尝试了很多，但是没有成功
pm = static //was dynamic before pm.max_children = 800 pm.start_servers = 225 pm.min_spare_servers = 150 pm.max_spare_servers = 800 pm.max_requests = 5000 // was 500 before
每个php-fpm使用大约10-15MB的RAM，我有16GB RAM。我使用下面的命令来检查每个进程使用多less内存
ps --no-headers -o "rss,cmd" -C php-fpm | awk '{ sum+=$1 } END { printf ("%d%s\n", sum/NR/1024,"M") }'
我的网站运行在专用服务器上，仅使用Nginx+PHP-FPM 。根据谷歌分析，该网站每天获得大约90K的综合浏览量。 我禁用nginx访问日志，并将notice的log_level更改为warning 。
编辑
iostat -p -xdmnh 5
Device: rrqm/s wrqm/sr/sw/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util sda 2.20 2044.20 86.60 118.40 3.31 8.45 117.42 4.11 20.03 1.70 34.76 sdb 0.00 2032.40 0.00 130.20 0.00 8.45 132.87 2.39 18.32 0.92 12.02 dm-0 0.00 0.00 88.80 2162.60 3.31 8.45 10.69 282.23 125.36 0.17 37.16 dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-2 0.00 0.00 88.80 2162.60 3.31 8.45 10.69 282.23 125.36 0.17 37.26 dm-3 0.00 0.00 88.80 2162.40 3.31 8.45 10.69 282.24 125.37 0.17 37.28 dm-4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Filesystem: rMB_nor/s wMB_nor/s rMB_dir/s wMB_dir/s rMB_svr/s wMB_svr/s ops/s rops/s wops/s
编辑2 lsblk命令感谢泽维尔卢卡斯试图帮助我与此
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 931.5G 0 disk └─ddf1_4c534920202020201000007910009260471147116cfe0677 (dm-0) 253:0 0 931G 0 dmraid ├─ddf1_4c534920202020201000007910009260471147116cfe0677p1 (dm-1) 253:1 0 500M 0 part /boot └─ddf1_4c534920202020201000007910009260471147116cfe0677p2 (dm-2) 253:2 0 930.5G 0 part ├─vg_485067-lv_root (dm-3) 253:3 0 50G 0 lvm / ├─vg_485067-lv_swap (dm-4) 253:4 0 7.8G 0 lvm [SWAP] └─vg_485067-lv_home (dm-5) 253:5 0 872.7G 0 lvm /home sdb 8:16 0 931.5G 0 disk └─ddf1_4c534920202020201000007910009260471147116cfe0677 (dm-0) 253:0 0 931G 0 dmraid ├─ddf1_4c534920202020201000007910009260471147116cfe0677p1 (dm-1) 253:1 0 500M 0 part /boot └─ddf1_4c534920202020201000007910009260471147116cfe0677p2 (dm-2) 253:2 0 930.5G 0 part ├─vg_485067-lv_root (dm-3) 253:3 0 50G 0 lvm / ├─vg_485067-lv_swap (dm-4) 253:4 0 7.8G 0 lvm [SWAP] └─vg_485067-lv_home (dm-5) 253:5 0 872.7G 0 lvm /home
然而，当我尝试以下我得到没有输出（没有任何错误消息。
diff <(lsof +D /home) <(sleep 60 ; lsof +D /home)
编辑3 （再次感谢泽维尔卢卡斯）
diff <(lsof +D /) <(sleep 60 ; lsof +D /)
这是结果
http://pastebin.com/vhCtQynu
是的，我的网站使用命令行工具，但我升级的CPU和内存只是为了能够支持。也是命令行工具不下载任何东西，所以我不明白为什么IO是高
我在1gbps专用端口上使用带有16gb ram的Dual Xeon E5-2620 。
按照您的要求，您可以通过这种方式来区分指定挂载点的文件活动。
首先，使用lsblk命令获取使用iostat标识的设备的挂载点。
结果将如下所示：
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 16G 0 disk ├─sda1 8:1 0 200M 0 part /boot └─sda2 8:2 0 15.8G 0 part ├─vg00-root (dm-0) 253:0 0 1G 0 lvm / ├─vg00-swap (dm-1) 253:1 0 1G 0 lvm [SWAP] ├─vg00-usr (dm-2) 253:2 0 5G 0 lvm /usr ├─vg00-var (dm-3) 253:3 0 2G 0 lvm /var ├─vg00-log (dm-4) 253:4 0 1G 0 lvm /var/log ├─vg00-tmp (dm-5) 253:5 0 2G 0 lvm /tmp ├─vg00-home (dm-6) 253:6 0 1G 0 lvm /home ├─vg00-rpm (dm-7) 253:7 0 1G 0 lvm /var/lib/rpm
然后在高IO活动期间运行：
diff <(lsof +D <mountpoint>) <(sleep <delay_seconds> ; lsof +D <mountpoint>)
例如，我的dm-2挂载点间隔为60秒：
diff <(lsof +D /usr) <(sleep 60 ; lsof +D /usr)
然后它将输出文件列表之间的差异，查看大小/偏移量列，看看哪些增长。
你的问题可能是由php5-fpm.sock中的高命中率引起的。你可以通过改变nginx连接到php-fpm的方式来testing。
listen = /tmp/php5-fpm.sock
并添加
listen = 127.0.0.1:9000
在nginx中
fastcgi_pass 127.0.0.1:9000;
而不是
unix:/tmp/php5-fpm.sock
希望这会有所帮助