php高并发优化实践

与4核心8G的服务器配置为例：
nginx配置：
keepalive_timeout  0;
php配置：
zend_extension=opcache.so
opcache.enable=1
opcache.enable_cli=1
opcache.huge_code_pages=1
opcache.file_cache=/tmp 
php-fpm配置：
pm = dynamic
pm.max_children = 1200
pm.start_servers = 20
pm.min_spare_servers = 10
pm.max_spare_servers = 1000
request_terminate_timeout = 30
rlimit_files = 102400
当然以上是关键配置，其它配置在网上很多如下：
user   www www;

worker_processes 8;

worker_cpu_affinity 00000001 00000010 00000100 00001000 00010000 00100000 01000000;

error_log   /www/log/nginx_error.log   crit;

pid         /usr/local/nginx/nginx.pid;

worker_rlimit_nofile 65535;

 

events

{

   use epoll;

   worker_connections 65535;

}

 

http

{

   include       mime.types;

   default_type   application/octet-stream;

 

   charset   utf-8;

 

   server_names_hash_bucket_size 128;

   client_header_buffer_size 2k;

   large_client_header_buffers 4 4k;

   client_max_body_size 8m;

 

   sendfile on;

   tcp_nopush     on;

 

   keepalive_timeout 60;

 

   fastcgi_cache_path /usr/local/nginx/fastcgi_cache levels=1:2

                 keys_zone=TEST:10m

                 inactive=5m;

   fastcgi_connect_timeout 300;

   fastcgi_send_timeout 300;

   fastcgi_read_timeout 300;

   fastcgi_buffer_size 16k;

   fastcgi_buffers 16 16k;

   fastcgi_busy_buffers_size 16k;

   fastcgi_temp_file_write_size 16k;

   fastcgi_cache TEST;

   fastcgi_cache_valid 200 302 1h;

   fastcgi_cache_valid 301 1d;

   fastcgi_cache_valid any 1m;

   fastcgi_cache_min_uses 1;

   fastcgi_cache_use_stale error timeout invalid_header http_500; 

   open_file_cache max=204800 inactive=20s;

   open_file_cache_min_uses 1;

   open_file_cache_valid 30s; 

 

   tcp_nodelay on;

   

   gzip on;

   gzip_min_length   1k;

   gzip_buffers     4 16k;

   gzip_http_version 1.0;

   gzip_comp_level 2;

   gzip_types       text/plain application/x-javascript text/css application/xml;

   gzip_vary on;

 

   server

   {

     listen       8080;

     server_name   huan.shouyiren.net;

     index index.php index.htm;

     root   /www/html/;

 

     location /status

     {

         stub_status on;

     }

 

     location ~ .*\.(php|php5)?$

     {

         fastcgi_pass 127.0.0.1:9000;

         fastcgi_index index.php;

         include fcgi.conf;

     }

 

     location ~ .*\.(gif|jpg|jpeg|png|bmp|swf|js|css)$

     {

       expires       30d;

     }

 

     log_format   access   '$remote_addr - $remote_user [$time_local] "$request" '

               '$status $body_bytes_sent "$http_referer" '

               '"$http_user_agent" $http_x_forwarded_for';

     access_log   /www/log/access.log   access;

 

}

/etc/sysctl.conf配置如下：
vm.swappiness = 0
vm.nr_hugepages=512
vm.max_map_count= 655360


net.ipv4.neigh.default.gc_stale_time=120
net.ipv4.conf.all.rp_filter=0
net.ipv4.conf.default.rp_filter=0
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.all.arp_announce=2
net.ipv4.conf.lo.arp_announce=2
net.ipv4.conf.eth0.rp_filter = 0


net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rmem = 4096        87380   4194304
net.ipv4.tcp_wmem = 4096        16384   4194304
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216




net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_keepalive_time = 30 
net.ipv4.tcp_keepalive_probes = 3 
net.ipv4.tcp_keepalive_intvl = 15 
net.ipv4.ip_local_port_range = 1024 65000 
net.ipv4.tcp_max_syn_backlog = 262144 
net.ipv4.tcp_max_tw_buckets = 20000 
net.core.somaxconn = 262144
net.core.netdev_max_backlog = 262144
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syn_retries = 1